作者： Huang, Zheao;Zhou, Jianqing;Zhao, Yingying;Cheng, Hengbin;Lu, Gongxuan;...

期刊： Journal of Materials Research,2021年36(3):602-614 ISSN：0884-2914

通讯作者： Yu, Ying

作者机构： [Huang, Zheao; Zhao, Yingying; Yu, Ying; Cheng, Hengbin; Zhou, Jianqing] Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan 430079, Peoples R China.;[Lu, Gongxuan] Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Oxo Synth & Select Oxidat, Lanzhou 730000, Peoples R China.;[Morawski, A. W.] West Pomeranian Univ Technol, Dept Inorgan Chem Technol & Environm Engn, Ul Pulaskiego 10, PL-70322 Szczecin, Poland.

通讯机构： [Yu, Ying] C;Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan 430079, Peoples R China.

关键词： Metal–organic framework (MOF);Core/shell;Crystal growth;Interface

摘要： Compared to single metal–organic framework (MOF), core–shell MOF crystals are more promising due to their special structure and unique properties. Herein, since ZIF-8 and ZIF-67 have the same topology, crystal growth method is used to synthesize core–shell crystals ZIF-8@ZIF-67, which exhibit far superior light adsorption, charge separation capabilities, and excellent stability than ZIF-8 and ZIF-67. The photocatalytic H2 generation rate for ZIF-8@ZIF-67 (1:1) is about 17 times higher than that of pure ZIF-67 without cocatalyst loading under same reaction conditions. Through a series of characterizations, two connection modes between ZIF-8 and ZIF-67 frames in core–shell contact interface are proposed, and the corresponding photocatalytic mechanism is elucidated. Transient photovoltaic curve reveals the unique transfer paths of electrons through contact interface, which leads to efficient charge separation compared with other ZIF materials. This study provides a novel and simple strategy to synthesis high effective and stable core–shell ZIF photocatalyst for photodegradation and hydrogen evolution.

语种： 英文

作者： Huang, Chuqiang;Zhong, Yuhong;Chen, Junxuan;Li, Jian;Zhang, Wei;...

期刊： Chemical Engineering Journal,2021年403:126304 ISSN：1385-8947

通讯作者： Yu, Luo;Yu, Ying

作者机构： [Zhang, Yuanlu; Zhong, Yuhong; Huang, Chuqiang; Yu, Luo; Yu, Ying; Zhang, Wei; Chen, Junxuan; Li, Jian; Zhou, Jianqing] Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan 430079, Peoples R China.;[Yu, Luo] Univ Houston, Dept Phys, Houston, TX 77204 USA.;[Yu, Luo] Univ Houston, TcSUH, Houston, TX 77204 USA.

通讯机构： [Yu, L; Yu, Y] C;[Yu, Luo] U;Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan 430079, Peoples R China.;Univ Houston, Dept Phys, Houston, TX 77204 USA.;Univ Houston, TcSUH, Houston, TX 77204 USA.

关键词： Electrolyzer;Fe-incorporated CoNi (oxy)hydroxide;Nanosheet-assembled nanorod;Oxygen evolution reaction;Self-template

摘要： Ni- and Co-based (oxy)hydroxides are promising candidates for oxygen evolution reaction (OER), but their limited specific surface area and poor intrinsic conductivity lead to unsatisfied OER activity. Herein, a unique and universal self-template strategy has been developed to fabricate Fe-incorporated CoNi (oxy)hydroxide (Fe-CoNi-OH) nanosheet-assembled nanorod arrays toward OER. The reorganized nanosheet-assembled nanorod hierarchical structure induced by Fe incorporation exposes more active sites and facilitates mass transfer. Furthermore, Fe incorporation modifies the electron structure of CoNi (oxy)hydroxide (CoNi-OH), and enhances its electronic conductivity for rapid electron transport, thus intrinsically enhancing the OER activity. Consequently, the Fe-CoNi-OH possesses excellent OER activity with low overpotentials of 210, 248, 304, and 349 mV to achieve current densities of 10, 100, 500, and 1000 mA cm−2, respectively, along with a very small Tafel slope of 28.0 mV dec−1, which are superior to the CoNi-OH and benchmark RuO2. By paring the Fe-CoNi-OH anode with a CoP cathode, an outstanding alkaline electrolyzer has been constructed, which only requires cell voltages of 1.506 and 1.623 V to deliver current densities of 10 and 100 mA cm−2, respectively, and can stably work for 100 h. This work provides a universal strategy to synthesize Fe-containing hierarchical nanostructured catalysts for energy conversion application. © 2020 Elsevier B.V.

语种： 英文

作者： Sun, Shangyu*;Yu, Wenfei;Yu, Yunwei（俞云伟）;Mao, Dongming

期刊： ASTROPHYSICAL JOURNAL,2021年907(1):25-null ISSN：0004-637X

通讯作者： Sun, Shangyu

作者机构： [Yu, Wenfei; Sun, Shangyu; Mao, Dongming] Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, 80 Nandan Rd, Shanghai 200030, Peoples R China.;[Yu, Yunwei] Cent China Normal Univ, Inst Astrophys, Wuhan 430079, Peoples R China.

通讯机构： [Sun, Shangyu] C;Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, 80 Nandan Rd, Shanghai 200030, Peoples R China.

关键词： Radio bursts;Radio transient sources;Neutron stars;Magnetars;X-ray transient sources;Non-thermal radiation sources

摘要： The nature of fast radio bursts (FRBs) is currently unknown. Repeating FRBs offer better observation opportunities than nonrepeating FRBs because their simultaneous multiwavelength counterparts might be identified. The magnetar flare model of FRBs is one of the most promising models that predict high-energy emission in addition to radio burst emission. To investigate such a possibility, we have searched for simultaneous and quasi-simultaneous short-term hard X-ray bursts in all Swift/BAT event mode data, which covered the periods when FRB detections were reported in the repeating FRB 121102, by making use of BAT's arcminute-level spatial resolution and wide field of view. We did not find any significant hard X-ray bursts that occurred simultaneously with those radio bursts. We also investigated potential short X-ray bursts that occurred quasi-simultaneously with those radio bursts (occurrence time differs in the range from hundreds of seconds to thousands of seconds) and concluded that even the best candidates are consistent with background fluctuations. Therefore, our investigation concluded that there were no hard X-ray bursts detectable with Swift/BAT that occurred simultaneously or quasi-simultaneously with those FRBs in the repeating FRB 121102.

语种： 英文

作者： Zhang, Meng;Zhang, Jiting;Ran, Siyi;Qiu, Lingxi;Sun, Wei*;...

期刊： 纳米研究：英文版,2021年14(4):1175-1186 ISSN：1998-0124

通讯作者： Yu, Ying;Zhu, Zhihong;Sun, Wei

作者机构： [Qiu, Lingxi; Ran, Siyi; Zhang, Jiting; Zhu, Zhihong; Yu, Ying; Zhang, Meng; Chen, Jisheng; Zhu, ZH] Cent China Normal Univ, Inst Nanosci & Nanotechnol, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.;[Sun, Wei] Hainan Normal Univ, Coll Chem & Chem Engn, Key Lab Laser Technol & Optoelect Funct Mat Haina, Haikou 571158, Hainan, Peoples R China.

通讯机构： [Yu, Y; Zhu, ZH] C;[Sun, Wei] H;Cent China Normal Univ, Inst Nanosci & Nanotechnol, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.;Hainan Normal Univ, Coll Chem & Chem Engn, Key Lab Laser Technol & Optoelect Funct Mat Haina, Haikou 571158, Hainan, Peoples R China.

关键词： biomass;Fe-N-C;NiFe-LDH;oxygen reduction reaction;oxygen evolution reaction;rechargeable Zn-air batteries

摘要： NiFe layered double hydroxide (NiFe-LDH) nanosheets and metal-nitrogen-carbon materials (M-N-C, M = Ni, Fe, Co, etc.) are supreme catalysts in the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) process, respectively. Nevertheless, the monotonic performance and insufficient stability severely hamper their practical application in rechargeable batteries. Herein, we simultaneously combine ultrathin NiFe-LDH nanowalls with renewable soybean-derived Fe-N-C matrix to obtain a hybrid materials (NiFe-LDH/FeSoy-CNSs-A), which exhibits robust catalytic activities for OER (Ej=10 = 1.53 V vs. RHE) and ORR (E1/2 = 0.91 V vs. RHE), with a top-notch battery parameters and stability in assembled rechargeable Zn-air batteries. Intensive investigations indicate that the vertically dispersed NiFe-LDH nanosheets, Fe-N-C matrix derived from soybean and the strong synergy between them are responsible for the unprecedented OER and ORR performances. The key role of intrinsic N defects involved in the hybrid materials is firstly specified by ultrasoundassisted extraction of soy protein from soybean. The exquisite design can facilitate the utilization of sustainable biomass-derived catalysts, and the mechanism investigations of N defects and oxygenic groups on the structure-activity relationship can stimulate the progress of other functional hybrid electrocatalysts.

语种： 英文

作者： Huang, Chuqiang;Yu, Luo*;Zhang, Wei;Xiao, Qin;Zhou, Jianqing;...

期刊： Applied Catalysis B: Environmental,2020年276:119137 ISSN：0926-3373

通讯作者： Yu, Luo;Yu, Ying

作者机构： [Xiao, Qin; Zhang, Yuanlu; Huang, Chuqiang; Yu, Luo; Yu, Ying; Zhang, Wei; Zhou, Jianqing] Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan 430079, Peoples R China.;[Yu, Luo] Univ Houston, Dept Phys & TcSUH, Houston, TX 77204 USA.;[Zhang, Jing; An, Pengfei] Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Radiat Facil, Beijing 100049, Peoples R China.

通讯机构： [Yu, L; Yu, Y] C;[Yu, Luo] U;Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan 430079, Peoples R China.;Univ Houston, Dept Phys & TcSUH, Houston, TX 77204 USA.

关键词： Electron transfer;Hydrogen evolution reaction;N doping;Ni-Mo based sulfides;Stability

摘要： Transition-metal sulfides (TMS) have been widely studied for electrocatalytic hydrogen evolution reaction (HER). Nevertheless, the HER activity is still far lower than the benchmark Pt-based materials due to the sparse exposed active sites, poor electron transfer and unsatisfying stability of TMS. In this work, we have successfully prepared N-doped Ni-Mo based sulfide cuboid arrays on Ni foam (denoted as N-NiMoS) towards high-efficiency and long-term HER. Systematic investigations confirm that N doping effectively regulates the electron density and tunes d-band center of NiMoS, which facilitate electron transport and improve electronic conductivity. Additionally, the hierarchical N-NiMoS cuboid arrays present larger surface area with more exposed active sites, thus endowing our catalyst with excellent HER catalytic activity with low overpotentials of 68, 250, and 322 mV at current densities of 10, 500, and 1000 mA cm−2, respectively. Impressively, the N-NiMoS electrode also displays superior stability, with a unattenuated current density over 1000-h HER operation. © 2020 Elsevier B.V.

语种： 英文

作者： Zhang, Wei;Huang, Chuqiang;Xiao, Qin;Yu, Luo;Shuai, Ling;...

期刊： JOURNAL OF THE AMERICAN CHEMICAL SOCIETY,2020年142(26):11417-11427 ISSN：0002-7863

通讯作者： Qiu, Ming;Yu, Ying;Ren, Zhifeng

作者机构： [Xiao, Qin; Huang, Chuqiang; Zhang, Wei; Yu, Ying; Yu, Luo; Shuai, Ling; Qiu, Ming] Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan 430079, Peoples R China.;[Yu, Luo; Ren, Zhifeng] Univ Houston, Dept Phys, Houston, TX 77204 USA.;[Yu, Luo; Ren, Zhifeng] Univ Houston, Texas Ctr Superconduct, Univ Houston TcSUH, Houston, TX 77204 USA.;[Zhang, Jing; An, Pengfei] Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Radiat Facil, Beijing 100049, Peoples R China.

通讯机构： [Qiu, M; Yu, Y] C;[Ren, Zhifeng] U;Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan 430079, Peoples R China.;Univ Houston, Dept Phys, Houston, TX 77204 USA.;Univ Houston, Texas Ctr Superconduct, Univ Houston TcSUH, Houston, TX 77204 USA.

摘要： Oxygen-bearing copper (OBC) has been widely studied for enabling the C-C coupling of the electrocatalytic CO(2) reduction reaction (CO(2)RR) since this is a distinctive hallmark of strongly correlated OBC systems and may benefit many other Cu-based catalytic processes. Unresolved problems, however, include the instability of and limited knowledge regarding OBC under realistic operating conditions, raising doubts about its role in CO(2)RR. Here, an atypical and stable OBC catalyst with a hierarchical pore and nanograin-boundary structure was constructed and was found to exhibit efficient CO(2)RR for the production of ethylene with a Faradaic efficiency of 45% at a partial current density of 44.7 mA cm(-2) in neutral media, and the ethylene partial current density is nearly 26 and 116 times that of oxygen-free copper (OFC) and commercial Cu foam, respectively. More importantly, the structure-activity relationship in CO(2)RR was explored through a comprehensive analysis of experimental data and computational techniques, thus increasing the fundamental understanding of CO(2)RR. A systematic characterization analysis suggests that atypical OBC (Cu(4)O) was formed and that it is stable even at -1.00 V [(vs the reversible hydrogen electrode (RHE)]. Density functional theory calculations show that the atypical OBC enables control over CO adsorption and dimerization, making it possible to implement a preference for the electrosynthesis of ethylene (C(2)) products. These results provide insight into the synthesis and structural characteristics of OBC as well as its interplay with ethylene selectivity.

语种： 英文

作者： Yu, Luo;Wu, Libo;McElhenny, Brian;Song, Shaowei;Luo, Dan;...

期刊： Energy & Environmental Science,2020年13(10):3439-3446 ISSN：1754-5692

通讯作者： Chen, Shuo;Ren, Zhifeng;Yu, Ying

作者机构： [Luo, Dan; McElhenny, Brian; Wu, Libo; Zhang, Fanghao; Chen, Shuo; Yu, Luo; Song, Shaowei; Chen, S; Ren, Zhifeng] Univ Houston, Univ Houston TcSUH, Dept Phys, Houston, TX 77204 USA.;[Luo, Dan; McElhenny, Brian; Wu, Libo; Zhang, Fanghao; Chen, Shuo; Yu, Luo; Song, Shaowei; Chen, S; Ren, Zhifeng] Univ Houston, Univ Houston TcSUH, Texas Ctr Superconduct, Houston, TX 77204 USA.;[Yu, Ying; Yu, Luo] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.

通讯机构： [Chen, S; Ren, ZF] U;[Yu, Ying] C;Univ Houston, Univ Houston TcSUH, Dept Phys, Houston, TX 77204 USA.;Univ Houston, Univ Houston TcSUH, Texas Ctr Superconduct, Houston, TX 77204 USA.;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.

摘要： Developing energy- and time-saving methods to synthesize active and stable oxygen evolving catalysts is of great significance to hydrogen production from water electrolysis, which however remains a grand challenge. Here we report a one-step approach to grow highly porous S-doped Ni/Fe (oxy)hydroxide catalysts on Ni foam in several minutes under room temperature. This ultrafast method effectively engineers the surface of Ni foam into a rough S-doped Ni/Fe (oxy)hydroxide layer, which has multiple levels of porosity and good hydrophilic features and exhibits extraordinary oxygen evolution reaction (OER) performance in both alkaline salty water and seawater electrolytes. Specifically, the S-doped Ni/Fe (oxy)hydroxide catalyst requires low overpotentials of 300 and 398 mV to deliver current densities of 100 and 500 mA cm-2, respectively, when directly used as an OER catalyst in alkaline natural seawater electrolyte. Using this OER catalyst together with an efficient hydrogen evolution reaction catalyst, we have achieved the commercially demanded current densities of 500 and 1000 mA cm-2 at low voltages of 1.837 and 1.951 V, respectively, for overall alkaline seawater electrolysis at room temperature with very good durability. This work affords a cost-efficient surface engineering method to steer commercial Ni foam into robust OER catalysts for seawater electrolysis, which has important implications for both the hydrogen economy and environmental remediation. © The Royal Society of Chemistry.

语种： 英文

作者： Hu, Hao*;Cheng, Haoyan*;Song, Kexing;Dai, Shuge;Liu, Yong;...

期刊： Journal of Power Sources,2020年472(Oct.1):228599.1-228599.8 ISSN：0378-7753

通讯作者： Cheng, Haoyan;Liu, Meilin;Hu, Hao

作者机构： [Stock, Heinz-Rolf; Hu, Hao; Cheng, Haoyan; Song, Kexing; Liu, Yong] Henan Univ Sci & Technol, Collaborat Innovat Ctr Nonferrous Met, Sch Mat Sci & Engn, Luoyang 471023, Peoples R China.;[Liu, Meilin; Hu, Hao] Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA.;[Dai, Shuge] Zhengzhou Univ, Key Lab Mat Phys, Minist Educ, Sch Phys & Engn, Zhengzhou 450052, Peoples R China.;[Yu, Ying] Cent China Normal Univ, Inst Nanosci & Nanotechnol, Coll Phys Sci & Technol, Wuhan 430079, Hubei, Peoples R China.;[Zhang, Zaoli] Austrian Acad Sci, Erich Schmid Inst Mat Sci, A-8700 Leoben, Austria.

通讯机构： [Cheng, Haoyan; Hu, Hao] H;[Liu, Meilin] G;Henan Univ Sci & Technol, Collaborat Innovat Ctr Nonferrous Met, Sch Mat Sci & Engn, Luoyang 471023, Peoples R China.;Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA.;Henan Univ Sci & Technol, Collaborat Innovat Ctr Nonferrous Met Henan Prov, Sch Mat Sci & Engn, Luoyang 471023, Peoples R China.

关键词： TiO2 nanorod bundles;Neodymium ions;Morphology director;Electrochemical performance

摘要： Morphology is a key parameter in the design of novel nanocrystals with desired functional properties. Here we report our findings in controlling or tuning the morphology of TiO2 nanorod bundles using neodymium ions (Nd3+) in order to dramatically enhance Li ion transport during the lithiation process. We have revealed the underlying growth mechanism by tracking the evolution of the TiO2 nanocrystals during the growth process. By carefully controlling experimental conditions, we have successfully directed the growth of TiO2 nanocrystal along the [001] direction. When tested in a Li-ion battery, the obtained TiO2 nanorod bundles display superior electrochemical performance, demonstrating high capacity (305 mA h/g at 0.1 A/g) and excellent cycling stability (only 1.6% capacity fading per 100 cycles over 800 cycles). The approach may be applicable to the fabrication of other metal oxides with a broad range of compositions and properties.

语种： 英文

作者： Zhang, Wei;Chen, Wenjuan;Xiao, Qin;Yu, Luo;Huang, Chuqiang;...

期刊： Applied Catalysis B: Environmental,2020年268:118449 ISSN：0926-3373

通讯作者： Yu, Ying

作者机构： [Xiao, Qin; Huang, Chuqiang; Zhang, Wei; Chen, Wenjuan; Yu, Ying; Yu, Luo] Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan 430079, Peoples R China.;[Yu, Luo] Univ Houston, Dept Phys, Houston, TX 77204 USA.;[Yu, Luo] Univ Houston, TcSUH, Houston, TX 77204 USA.;[Lu, Gongxuan] Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Oxo Synthsis & Select Oxidat, Lanzhou 730000, Peoples R China.;[Morawski, A. W.] West Pomeranian Univ Technol, Dept Inorgan Chem Technol & Environm Engn, Ul Pulaskiego 10, PL-70322 Szczecin, Poland.

通讯机构： [Yu, Ying] C;Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan 430079, Peoples R China.

关键词： CoS2;Electrocatalysis;Oxygen evolution reaction;X-ray absorption spectroscopy

摘要： Oxygen evolution reaction (OER) is a key process in electrochemical conversion technologies. The rational design of efficient catalyst and understanding of structure-property relationship in catalysis still remain grand challenge. Herein, nitrogen-coordinated CoS2 ultrafine nanoparticles (NPs) self-encapsulated in graphene (N-CoS2@graphene) are obtained through employing zeolitic imidazolate frameworks (ZIFs) as precursors. An in-situ N-coordinated and graphene self-encapsulated strategy is developed to improve the catalytic activity and stability. As expected, the N-CoS2@graphene achieved an extremely low overpotentials of only 205 and 292 mV at the current density of 10 and 100 mA cm−2 for OER, respectively, showing superior activities as compared with state-of-the-art transition-metal-based catalysts. Mechanism explorations reveal that the N-CoS2@graphene offers unique graphene self-encapsulated structure and modulated electron structure of the catalytic sites, which synergistically promotes intrinsic activity and stablility of catalyst. It is expected that the strategy presented here provides prospects for the design of other highly active electrocatalysts for energy conversion. © 2019 Elsevier B.V.

语种： 英文

作者： Zhou, Jianqing;Li, Yifei;Yu, Luo;Li, Zhengpeng;Xie, Danfeng;...

期刊： Chemical Engineering Journal,2020年385:123940 ISSN：1385-8947

通讯作者： Yu, Ying

作者机构： [Li, Yifei; Zhao, Yingying; Yu, Ying; Yu, Luo; Xie, Danfeng; Zhou, Jianqing; Li, Zhengpeng] Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan 430079, Peoples R China.;[Yu, Luo] Univ Houston, Dept Phys, Houston, TX 77204 USA.;[Yu, Luo] Univ Houston, TcSUH, Houston, TX 77204 USA.

通讯机构： [Yu, Ying] C;Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan 430079, Peoples R China.

关键词： CO2 reduction;Cu2[email protected];Heterostructured nanorods;In situ fabrication;Visible-light

摘要： Cuprous oxide (Cu2O) is known to be a promising photocatalyst for CO2 reduction into solar fuels under visible-light irradiation. However, the issues of fast recombination of photogenerated carriers and photocorrosion severely limit its photocatalytic (PC) performance. Herein, we report a unique design of one-dimensional (1D) Cu2O@Cu metal-semiconductor heterostructured nanorods via a simple in situ reduction method for efficient CO2 reduction to hydrocarbons fuels. The well-defined 1D Cu2O nanorod arrays ensure excellent visible-light harvesting capability, and the in situ fabricated Cu2O@Cu heterostructure endows the catalyst with enhanced conductivity as well as highly improved separation and transfer efficiency of photogenerated carriers. Consequently, the optimized Cu2O@Cu heterostructure achieves an apparent quantum efficiency of 2.40% for CH4 and C2H4 and as high as 92% activity retained after four PC cycles. Furthermore, the CO2 reduction performance was further improved when applied a low external bias. This study not only provides a novel, low-cost, and efficient strategy to address the stability and activity issues of Cu2O, but also sheds light on the development of active and robust photocatalysts for energy conversion and storage.

语种： 英文

作者： Huang, Chuqiang;Zhu, Qiancheng;Zhang, Wei;Qi, Pengcheng;Xiao, Qin;...

期刊： Electrochimica Acta,2020年330:135209 ISSN：0013-4686

通讯作者： Yu, Ying

作者机构： [Xiao, Qin; Zhu, Qiancheng; Qi, Pengcheng; Huang, Chuqiang; Zhang, Wei; Yu, Ying] Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan 430079, Hubei, Peoples R China.

通讯机构： [Yu, Ying] C;Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan 430079, Hubei, Peoples R China.

关键词： Hydrogenation;w(5)O(14);Crystal channels;Ion diffusion

摘要： The crystal structure of WO3 is orderly arranged with WO6 structure, possessing crystal channels for convenient charge transfer and ion diffusion. Using effective strategies to broaden the crystal channels of this materials can improve the charge transfer and ion diffusion. In this work, we have facilely utilized a sample hydrogenation method to introduce distorted WO6 structures into the crystal of tungsten oxide, which leads to the crystal reconstruction and W5O14 formation with large crystal channels. Due to the existence of large crystal channels, as-fabricated W5O14 nanosheet arrays achieve a high specific capacitance of 1352 mF cm(-2) (524 F g(-1)) at current density of 1 mA cm(-2), much higher than that of WO3. In addition, W5O14 nanosheet arrays also exhibit good stability with 84% capacitance retention after 4000 cycles. Finally, the high energy and power density of the asymmetric full supercapacitor W5O14//RuO2 device shed light on the potentially commercial application of W5O14. (C) 2019 Elsevier Ltd. All rights reserved.

语种： 英文

作者： Zhu, Qiancheng;Xiao, Qin;Zhang, Bowen;Yan, Zhengcong;Liu, Xi;...

期刊： Journal of Materials Chemistry A,2020年8(21):10761-10766 ISSN：2050-7488

通讯作者： Yu, Ying;Chen, Shuo;Ren, Zhifeng

作者机构： [Xiao, Qin; Zhu, Qiancheng; Liu, Xi; Zhang, Bowen; Yu, Ying; Yan, Zhengcong] Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan 430079, Peoples R China.;[Chen, Shuo; Chen, S; Ren, Zhifeng] Univ Houston, Dept Phys, Univ Houston TcSUH, Houston, TX 77204 USA.;[Chen, Shuo; Chen, S; Ren, Zhifeng] Univ Houston, Texas Ctr Superconduct, Univ Houston TcSUH, Houston, TX 77204 USA.

通讯机构： [Yu, Ying] C;[Chen, S; Ren, ZF] U;Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan 430079, Peoples R China.;Univ Houston, Dept Phys, Univ Houston TcSUH, Houston, TX 77204 USA.;Univ Houston, Texas Ctr Superconduct, Univ Houston TcSUH, Houston, TX 77204 USA.

摘要： Non-aqueous lithium-ion batteries are currently widely used throughout society, but aqueous batteries could be more feasible for grid-scale applications or even electric cars when factors like cost and safety are taken into consideration. Rechargeable aqueous zinc-ion batteries are promising energy storage devices due to their high energy density, safety, environmental friendliness, and low cost. However, their development for commercial applications remains in the beginning stages because of the limited options among positive electrodes exhibiting adequate capacity and cycle life. Furthermore, their energy-storage mechanisms are not yet well established. Here, vanadium tetrasulfide (VS4) with a beneficial one-dimensional atomic-chain structure is reported to be able to serve as a favorable intercalation cathode material for high-performance Zn-ion batteries. The energy-storage mechanism was investigated both theoretically and experimentally. The maximum capacity of this material reaches 310 mA h g−1and 85% of this capacity remains even after 500 cycles, which is promising for future practical applications. © The Royal Society of Chemistry 2020.

语种： 英文

作者： Xie, Yunlong;Li, Xiang;Wang, Yu;Li, Biwen;Yang, Lun;...

期刊： Applied Surface Science,2020年499:143964 ISSN：0169-4332

通讯作者： Yu, Ying

作者机构： [Wang, Xiuzhang; Xie, Yunlong; Wang, Yu; Liu, J-M; Li, Biwen; Yang, Lun; Zhao, Nian; Liu, Meifeng; Li, Xiang] Hubei Normal Univ, Inst Adv Mat, Huangshi 435002, Hubei, Peoples R China.;[Xie, Yunlong; Yu, Ying] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Hubei, Peoples R China.;[Liu, J-M] Nanjing Univ, Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China.;[Liu, J-M] Nanjing Univ, Innovat Ctr Adv Microstruct, Nanjing 210093, Jiangsu, Peoples R China.

通讯机构： [Yu, Ying] C;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Hubei, Peoples R China.

会议名称： 3rd International Workshop on Graphene and C3N4-Based Photocatalysts (IWGCP)

会议时间： MAR 23-26, 2019

会议地点： Wuhan Univ Technol, Wuhan, PEOPLES R CHINA

会议主办单位： Wuhan Univ Technol

关键词： CO2 reduction;DFT;Electrocatalysis;MoS2;Transition metal dichalcogenide

摘要： Since the reduction of CO2 to fuels by consuming over-generated electricity, which can establish artificial carbon cycle and energy storage at the same time, extensive studies have been devoted to developing suitable catalysts for CO2 conversion in materials science. Recently, MoS2, a typical member of transition metal dichalcogenides, has been widely investigated for its high activity and low energy cost to catalyze CO2 reduction. In this work, we simulate the microscopic dynamic process of the CO2 reduction process in the framework of density functional theory (DFT). Our results reveal that Mo exposed edges of MoS2 are inclined to adsorb CO2 molecule and tend to catalytically reduce CO2 to CO. CO2 molecule is activated by two neighboring Mo atoms and the C[sbnd]O double bond reconstructs in the adsorption process. The first proton/electron (H+ + e−) reaction taking place at MoS2 edges undergoes a different pathway from that on transition metal catalyst, contributing to the product selectivity towards CO. Finally, we demonstrate that desorption of CO from MoS2 edges is in virtue of unique diffusion process for adsorbed CO atoms. © 2019 Elsevier B.V.

语种： 英文

作者： Huang, Zheao;Zhao, Shuo;Yu, Ying*

期刊： 催化学报,2020年41(10):1522-1534 ISSN：0253-9837

通讯作者： Yu, Ying

作者机构： [Huang, Zheao; Yu, Ying; Zhao, Shuo] Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan 430079, Hubei, Peoples R China.

通讯机构： [Yu, Ying] C;Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan 430079, Hubei, Peoples R China.

关键词： TiO2-C3N4;TiO2-C-C3N4;TiO2-C-C3N4;Photodegradation;Type-Ⅱheterojunction semiconductor;Z-scheme heterojunction structure;semiconductor

摘要： TiO2 nanoparticles were prepared using the hydrothermal method and modified with C3N4 to synthesize a Type-II heterojunction semiconductor photocatalyst, TiO2-C3N4. In addition, a carbon layer was coated onto the TiO2 nanoparticles and the obtained material was uniformly covered on the surface of C3N4 to form an all-solid-state Z-scheme semiconductor photocatalyst, TiO2-C-C3N4. Through characterization by XRD, XPS, SEM, TEM, BET, photoelectrochemical experiments, UV-visible diffuse reflection, and PL spectroscopy, the charge transfer mechanism and band gap positions for the composite photocatalysts were analyzed. The Type-II and all-solid-state Z-scheme heterojunction structures were compared. By combining microscopic internal mechanisms with macroscopic experimental phenomena, the relationship between performance and structure was verified. Experimental methods were used to explore the adaptation degree of different photocatalytic mechanisms using the same degradation system. This study highlights effective photocatalyst design to meet the requirements for specific degradation conditions. © 2020 Dalian Institute of Chemical Physics, the Chinese Academy of Sciences

语种： 英文

作者： Zhang, Jiting;Zhang, Meng;Qiu, Lingxi;Zeng, Yan;Chen, Jisheng;...

期刊： Journal of Materials Chemistry A,2019年7(32):19045-19059 ISSN：2050-7488

通讯作者： Zhu, Zhihong

作者机构： [Qiu, Lingxi; Zhang, Jiting; Zhu, Zhihong; Yu, Ying; Zhang, Meng; Chen, Jisheng] Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan 430079, Hubei, Peoples R China.;[Zhu, Chengzhou; Zeng, Yan] Cent China Normal Univ, Key Lab Pesticide & Chem Biol, Int Joint Res Ctr Intelligent Biosensing Technol, Minist Educ,Coll Chem, Wuhan 430079, Hubei, Peoples R China.

通讯机构： [Zhu, Zhihong] C;Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan 430079, Hubei, Peoples R China.

摘要： NiFe alloys and metal-nitrogen-carbon materials (M-N-C, M = Ni, Fe, Co, etc.) are foremost catalysts in the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) process, respectively. Nevertheless, the monotonic performance and insufficient stability hinder their practical application in rechargeable batteries. Herein, we simultaneously combine Ni(Fe)OOH and Ni/Fe-N-C active sites together into 3D interconnected core-shell nanochains (Ni2Fe1@PANI-KOH900). The obtained catalyst exhibits robust activity and durability in both OER and ORR reactions with a startlingly low overpotential of 240 mV at a current density of 10 mA cm-2 (Ej=10 = 1.47 V vs. RHE) and a more positive half-wave potential (E1/2 = 0.92 V vs. RHE), superior to those of the benchmark RuO2 and Pt/C catalysts. The potential gap (ΔE = Ej=10 - E1/2) is merely 0.55 V. Intensive investigations through in situ confocal Raman and HTEM-HAADF techniques indicate that the Ni(Fe)OOH and Ni/Fe-N-C active species as well as the unique 3D interconnected network-like structure are responsible for the state-of-the-art OER and ORR performances. Furthermore, the assembled rechargeable Zn-air battery comprising Ni2Fe1@PANI-KOH900 exhibits unprecedented superior charging-discharging performance and durable cycle life, holding great potential for energy conversion and storage devices. © 2019 The Royal Society of Chemistry.

语种： 英文

作者： Zhang, Jiting;Zhang, Meng;Zeng, Yon;Chen, Jisheng;Qiu, Lingxi;...

期刊： Small,2019年15(24):1900307- ISSN：1613-6810

通讯作者： Zhu, Zhihong;Zhu, Chengzhou

作者机构： [Qiu, Lingxi; Zhang, Jiting; Zhu, Zhihong; Yu, Ying; Zhang, Meng; Chen, Jisheng] Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan 430079, Hubei, Peoples R China.;[Zhu, Chengzhou; Zeng, Yon] Cent China Normal Univ, Coll Chem, Key Lab Pesticide & Chem Biol, Minist Educ,Int Joint Res Ctr Intelligent Biosens, Wuhan 430079, Hubei, Peoples R China.;[Zhou, Hua; Sun, Chengjun] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA.

通讯机构： [Zhu, Zhihong; Zhu, Chengzhou] C;Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan 430079, Hubei, Peoples R China.;Cent China Normal Univ, Coll Chem, Key Lab Pesticide & Chem Biol, Minist Educ,Int Joint Res Ctr Intelligent Biosens, Wuhan 430079, Hubei, Peoples R China.

关键词： bifunctional catalysts;biomass;heteroatom doping;rechargeable Zn-air batteries;single-atom electrocatalysts

摘要： Iron–nitrogen–carbon materials (Fe–N–C) are known for their excellent oxygen reduction reaction (ORR) performance. Unfortunately, they generally show a laggard oxygen evolution reaction (OER) activity, which results in a lethargic charging performance in rechargeable Zn–air batteries. Here porous S-doped Fe–N–C nanosheets are innovatively synthesized utilizing a scalable FeCl3-encapsulated-porphyra precursor pyrolysis strategy. The obtained electrocatalyst exhibits ultrahigh ORR activity (E1/2 = 0.84 V vs reversible hydrogen electrode) and impressive OER performance (Ej= 10 = 1.64 V). The potential gap (ΔE = Ej= 10 − E1/2) is 0.80 V, outperforming that of most highly active bifunctional electrocatalysts reported to date. Furthermore, the key role of S involved in the atomically dispersed Fe–Nx species on the enhanced ORR and OER activities is expounded for the first time by ultrasound-assisted extraction of the exclusive S source (taurine) from porphyra. Moreover, the assembled rechargeable Zn–air battery comprising this bifunctional electrocatalyst exhibits higher power density (225.1 mW cm−2) and lower charging–discharging overpotential (1.00 V, 100 mA cm−2 compared to Pt/C + RuO2 catalyst). The design strategy can expand the utilization of earth-abundant biomaterial-derived catalysts, and the mechanism investigations of S doping on the structure–activity relationship can inspire the progress of other functional electrocatalysts. © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

语种： 英文

作者： Luo, D.;Zhang, F.;Ren, Z.*;Ren, W.;Yu, L.;...

期刊： Materials Today Physics,2019年9:100097 ISSN：2542-5293

通讯作者： Ren, Z.

作者机构： [Zhang, F.; Luo, D.; Jiang, L.; Yu, L.; Ren, Z.; Ren, W.] Univ Houston, Dept Phys, Houston, TX 77204 USA.;[Zhang, F.; Luo, D.; Jiang, L.; Yu, L.; Ren, Z.; Ren, W.] Univ Houston, TcSUH, Houston, TX 77204 USA.;[Zhang, F.] Univ Houston, Dept Chem, Univ Pk, Houston, TX 77204 USA.;[Wang, Z.; Ren, W.] Univ Elect Sci & Technol China, Inst Fundamental & Frontier Sci, Chengdu 610054, Sichuan, Peoples R China.;[Yu, Y.; Yu, L.] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Hubei, Peoples R China.

通讯机构： [Ren, Z.] U;Univ Houston, Dept Phys, Houston, TX 77204 USA.;Univ Houston, TcSUH, Houston, TX 77204 USA.

关键词： Dry ice;Graphene;Graphene oxide;Nanosheet;Oxidation

摘要： Because graphene oxide is so important for many applications and also the precursor for large quantity of graphene, a low cost and environmentally friendly method using much less acid is essential to the future of graphene oxide and graphene. It is a great challenge to reduce the acid usage to avoid the safety risk, but tremendous benefits could be achieved if this were made possible for the industrial-scale synthesis of graphene oxide and graphene. In this work, we report a fast and simple method that uses much less acid than the state of the art to obtain nanoscale graphene oxide by using the heat released by the reaction. With the introduction of dry ice, the reaction temperature can be well controlled, thus stabilizing the highly oxidative and explosive Mn2O7 intermediate in order to avoid safety risk. © 2019 Elsevier Ltd

语种： 英文

作者： Sun, Jingying;Ren, Muqing;Yu, Luo;Yang, Ze;Xie, Lixin;...

期刊： Small,2019年15(6):1804272- ISSN：1613-6810

通讯作者： Zhou, Haiqing;Ren, Zhifeng;Chen, Shuo

作者机构： [Zhou, Haiqing; Sun, Jingying] Hunan Normal Univ, Sch Phys & Elect, Minist Educ, Key Lab Low Dimens Quantum Struct & Quantum Contr, Changsha 410081, Hunan, Peoples R China.;[Chen, Shuo; Tian, Fei; Yang, Ze; Xie, Lixin; Ren, Zhifeng; Chen, S; Sun, Jingying] Univ Houston, Dept Phys, Houston, TX 77204 USA.;[Chen, Shuo; Tian, Fei; Yang, Ze; Xie, Lixin; Ren, Zhifeng; Chen, S; Sun, Jingying] Univ Houston, TcSUH, Houston, TX 77204 USA.;[Ren, Muqing] Rice Univ, Dept Chem, Houston, TX 77005 USA.;[Yu, Ying; Yu, Luo] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Hubei, Peoples R China.

通讯机构： [Zhou, Haiqing] H;[Ren, ZF; Chen, S] U;Hunan Normal Univ, Sch Phys & Elect, Minist Educ, Key Lab Low Dimens Quantum Struct & Quantum Contr, Changsha 410081, Hunan, Peoples R China.;Univ Houston, Dept Phys, Houston, TX 77204 USA.;Univ Houston, TcSUH, Houston, TX 77204 USA.

关键词： electrocatalysts;hydrogen evolution;phosphide;phosphosulfide;synergistic effects

摘要： Facile design of low-cost and high-efficiency catalysts with earth-abundant and cheap materials is desirable to replace platinum (Pt) for the hydrogen evolution reaction (HER) in water splitting, but the development of such HER catalysts with Pt-like activity using simple strategies remains challenging. A mesoporous hybrid catalyst of nickel phosphides nanoparticles and cobalt phosphosulfide/phosphide (CoS|Ni|P) nanosheet arrays for HER is reported here, which is developed by a facile three-step approach consisting of electrodeposition, thermal sulfurization, and phosphorization. This hybrid catalyst is highly robust and stable in acid for HER, and is distinguished by very low overpotentials of 41, 88, and 150 mV to achieve 10, 100, and 1000 mA cm −2 , respectively, as well as a small Tafel slope (45.2 mV dec −1 ), and a large exchange current density (964 µA cm −2 ). It is among the most efficient earth-abundant catalysts reported thus far for HER. More importantly, this electrocatalyst has electrochemical durability over 20 h under a wide range of current densities (up to 1 A cm −2 ) in acidic conditions, as well as very high turnover frequencies of 0.40 and 1.26 H 2 s −1 at overpotentials of 75 and 100 mV, respectively, showing that it has great potential for practical applications in large-scale water electrolysis. © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

语种： 英文

作者： Li, Zhengpeng;Cheng, Hengbin;Li, Yifei;Zhang, Wei;Yu, Ying*

期刊： ACS SUSTAINABLE CHEMISTRY & ENGINEERING,2019年7(4):4325-4334 ISSN：2168-0485

通讯作者： Yu, Ying

作者机构： [Zhang, Wei; Li, Yifei; Yu, Ying; Cheng, Hengbin; Li, Zhengpeng] Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Nanotechnol, 152 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.

通讯机构： [Yu, Ying] C;Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Nanotechnol, 152 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.

关键词： CO2 reduction;Photocatalysis;Photoelectrocatalysis;CdS;Cd vacancies

摘要： To convert greenhouse gas CO 2 to available energy by using solar energy is a promising approach for addressing energy dilemma and global warming issues. Although CdS as a photocatalyst can achieve CO 2 reduction to fuel, there are still two main problems of activity and stability to be solved. Herein, a simple hydrothermal method with the presence of a little quantity of H 2 O 2 is used to prepare CdS with Cd vacancies, which can promote the separation of photogenerated electrons and holes for activity improvement. It is found that the best catalyst 0.4CdS demonstrates not only high CO selectivity over other carbonaceous products, but also a considerable CO production rate of 316 μmol g -1 h -1 , which is 2.1 times as high as that of pure CdS for CO 2 reduction under visible light irradiation. In addition, an efficient solution through an additional feeble negative voltage to improve the photostability of 0.4CdS is achieved, which makes this sample remain 94.2% of its original CO 2 photoelectrocatalytic reduction performance after four cycles. Thus, this study provides a facile strategy to address the stability and activity issues of CdS under visible light irradiation, which is presumably suitable for improving the other semiconductors with low stability and activity for highly efficient CO 2 reduction. © 2019 American Chemical Society.

语种： 英文

作者： Yu, Luo;Song, Shaowei;McElhenny, Brian;Ding, Fazhu;Luo, Dan;...

期刊： Journal of Materials Chemistry A,2019年7(34):19728-19732 ISSN：2050-7488

通讯作者： Yu, Ying;Chen, Shuo;Ren, Zhifeng

作者机构： [Yu, Ying; Yu, Luo] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Hubei, Peoples R China.;[Luo, Dan; McElhenny, Brian; Chen, Shuo; Yu, Luo; Song, Shaowei; Chen, S; Ren, Zhifeng; Ding, Fazhu] Univ Houston, Dept Phys, Houston, TX 77204 USA.;[Luo, Dan; McElhenny, Brian; Chen, Shuo; Yu, Luo; Song, Shaowei; Chen, S; Ren, Zhifeng; Ding, Fazhu] Univ Houston, TcSUH, Houston, TX 77204 USA.;[Ding, Fazhu] Chinese Acad Sci, Key Lab Appl Superconduct, Beijing 100190, Peoples R China.;[Ding, Fazhu] Chinese Acad Sci, Inst Elect Engn, Beijing 100190, Peoples R China.

通讯机构： [Yu, Ying] C;[Chen, S; Ren, ZF] U;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Hubei, Peoples R China.;Univ Houston, Dept Phys, Houston, TX 77204 USA.;Univ Houston, TcSUH, Houston, TX 77204 USA.

摘要： Transition-metal nitrides have increasingly attracted interest for use as electrocatalysts in water splitting due to their superior catalytic activity and stability. However, the development of a general and simple strategy to synthesize metal nitrides remains challenging. Here we report a facile strategy for the synthesis of various porous monometallic and bimetallic nitrides on different substrates for the hydrogen evolution reaction (HER) in alkaline media. The best monometallic nitride of CoN supported on the Ni foam delivered current densities of 10 and 100 mA cm-2 at overpotentials of 95 and 212 mV, respectively in 1 M KOH. This performance was further improved through Ni-doping to form bimetallic nitrides of NiCoN, the best of which exhibited excellent HER performance with low overpotentials of 48 and 149 mV at current densities of 10 and 100 mA cm-2, respectively, along with superior stability in 1 M KOH. The enhanced performance is mainly attributed to the synergistic effect of Co and Ni, a larger surface area with more active sites, and improved electrical conductivity for more efficient charge transfer. This work demonstrates a particularly facile and general approach to synthesize porous transition metal nitrides with advanced HER performance. © 2019 The Royal Society of Chemistry.

语种： 英文