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： 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： 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： 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： 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： 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： 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： 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： 余颖;余罗;巴鑫;施国栋;李正鹏

作者机构： 华中师范大学物理科学与技术学院,武汉,430079

会议名称： 2019第四届中国能源材料化学研讨会

会议时间： 2019-05-25

会议地点： 大连

会议论文集名称： 2019第四届中国能源材料化学研讨会论文集

摘要： <正>众所周知,在太阳光作用下将CO2转化为燃料的能源转换领域需要高效催化剂,但是现有催化剂的活性和稳定性离实际应用还有较远的距离。研究表明金属铜及其氧化物CuOx可作为催化剂实现CO2的电化学、光化学和光电化学转化为各类燃料。为了更好地利用铜及其氧化物,并克服其在能量转换中稳定性较差的缺点,我们制备了纳米结构金属铜及其氧化物的各种复合物,将其直接用于光催化、电催化和光电催化还原CO2为燃料,

语种： 中文

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

作者： Zhu, Qiancheng;Cheng, Mingyu;Zhang, Bowen;Jin, Kai;Chen, Shuo*;...

期刊： Advanced Functional Materials,2019年29(50):1905979- ISSN：1616-301X

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

作者机构： [Zhu, Qiancheng; Jin, Kai; Zhang, Bowen; Yu, Ying; Cheng, Mingyu] Cent China Normal Univ, Inst Nanosci & Nanotechnol, Coll Phys Sci & Technol, Wuhan 430079, Hubei, Peoples R China.;[Chen, Shuo; Chen, S; Ren, Zhifeng] Univ Houston, Dept Phys, Houston, TX 77204 USA.

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

关键词： Cu–Zn batteries;high-performance batteries;rechargeable batteries

摘要： Rechargeable aqueous Zn-based batteries show great potential for energy storage systems due to their good reliability, low cost, environmental friendliness, etc. However, the capacity of the most studied Mn-, V-, and Prussian blue analog-based Zn-ion batteries (the type with Zn2+ insertion) and the other type Zn-based batteries without Zn2+ insertion (such as metal Ag and Ni or Co oxides/hydroxides) does not exceed 400 mAh g−1. Cu is a promising cathode with a high theoretical capacity of 844 mAh g−1 based on its unique two-electron transfer process (Cu0 ↔ Cu2+), but Cu–Zn batteries have been impractical to recharge since they was invented by Daniell in 1836. By adjusting the solubility of Cu2+ in an alkaline solution, a rechargeable high-performance Cu–Zn battery is achieved. A high specific capacity of 718 mAh g−1 is obtained for the prepared Cu clusters. Moreover, commercial Cu foil is explored for direct use as the cathode material and shows high capacity and stability through a simple self-activation process. This rechargeable Cu–Zn battery is attractive for application due to its high capacity, simple synthesis method, environmental friendliness, and low cost. © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

语种： 英文

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

期刊： ASTROPHYSICAL JOURNAL,2019年885(1):55 (5pp) ISSN：0004-637X

通讯作者： Sun, Shangyu

作者机构： [Yu, Wenfei; Lin, Jie; 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, Hubei, 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), which occur on millisecond timescales in the radio band, is well-understood. Among their unknown observational properties are their broadband spectra, and persistent and transient multiwavelength counterparts. Well-localized FRBs provide the opportunity to address these issues in archival observations. We performed searches for 15-150 keV hard X-ray bursts on timescales as short as 1 ms in the direction of the repeating FRB 121102 (with a spacial resolution of a few arcminutes) in the archival Swift/BAT data between 2016 October and 2017 September. We found no significant (5σ) hard X-ray bursts in the direction of the repeating FRB. We derived an upper limit of the hard X-ray (15-150 keV) flux of any X-ray bursts on a 1 ms timescale of around 1.01 × 10-7 erg cm-2 s-1, if assuming a photoindex of 2 for potential X-ray flares in the X-ray band. A plausible scenario for the repeating FRB as being associated with a magnetar giant flare is still far below the upper limit. © 2019. The American Astronomical Society. All rights reserved.

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： Liu, Rujun;Yang, Fan;Xie, Yonlong*;Yu, Ying*

期刊： Applied Surface Science,2019年466:568-577 ISSN：0169-4332

通讯作者： Xie, Yonlong;Yu, Ying

作者机构： [Liu, Rujun] Lingnan Normal Univ, Sch Informat Engn, Zhanjiang 524048, Peoples R China.;[Xie, YL; Yu, Ying; Liu, Rujun; Xie, Yonlong] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Hubei, Peoples R China.;[Yang, Fan] Wuhan Text Univ, Sch Elect & Elect Engn, Wuhan 430073, Hubei, Peoples R China.;[Xie, Yonlong] Hubei Normal Univ, Inst Adv Mat, Huangshi 435002, Peoples R China.;[Xie, Yonlong] Hubei Normal Univ, Sch Phys & Elect Sci, Huangshi 435002, Peoples R China.

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

关键词： B/N codoping;Bader analysis;ELF;GGA + U;TiO 2;{0 0 1} facet

摘要： To fully understand the synergistic effect of B/N codoping on the visible-light photocatalytic activity of anatase TiO 2 with exposed {0 0 1} facet, a combination of Density Functional Theory (DFT) calculation by GGA + U method and experiment has been performed. Bader charge and Electronic Location Function (ELF) analysis reveal that there is free electron-gas like behavior around N and neighbor B for B/N-codoped anatase TiO 2 with exposed {0 0 1} facet, and its visible-light absorbance increases, which may promote Ti 4+ reduction to Ti 3+ . The results of calculation and experiment demonstrate that B/N codoping leads to the shift of the absorption edge of the TiO 2 to lower energy region, and thus makes its photocatalysis active within the wavelength of 600 nm. © 2018 Elsevier B.V.

语种： 英文

作者： Yu, Luo;Zhu, Qing;Song, Shaowei;McElhenny, Brian;Wang, Dezhi;...

期刊： Nature Communications,2019年10(1):5106 ISSN：2041-1723

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.;[McElhenny, Brian; Chen, Shuo; Yu, Luo; Song, Shaowei; Wang, Dezhi; Ren, Zhifeng; Zhu, Qing] Univ Houston, Dept Phys, Houston, TX 77204 USA.;[McElhenny, Brian; Chen, Shuo; Yu, Luo; Song, Shaowei; Wang, Dezhi; Ren, Zhifeng; Zhu, Qing] Univ Houston, TcSUH, Houston, TX 77204 USA.;[Song, Shaowei; Zhu, Qing] Univ Houston, Mat Sci & Engn Program, Houston, TX 77204 USA.;[Qin, Zhaojun; Bao, Jiming; Wu, Chunzheng] Univ Houston, Dept Elect & Comp Engn, Houston, TX 77204 USA.

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： Seawater is one of the most abundant natural resources on our planet. Electrolysis of seawater is not only a promising approach to produce clean hydrogen energy, but also of great significance to seawater desalination. The implementation of seawater electrolysis requires robust and efficient electrocatalysts that can sustain seawater splitting without chloride corrosion, especially for the anode. Here we report a three-dimensional core-shell metal-nitride catalyst consisting of NiFeN nanoparticles uniformly decorated on NiMoN nanorods supported on Ni foam, which serves as an eminently active and durable oxygen evolution reaction catalyst for alkaline seawater electrolysis. Combined with an efficient hydrogen evolution reaction catalyst of NiMoN nanorods, we have achieved the industrially required current densities of 500 and 1000 mA cm−2 at record low voltages of 1.608 and 1.709 V, respectively, for overall alkaline seawater splitting at 60 °C. This discovery significantly advances the development of seawater electrolysis for large-scale hydrogen production. © 2019, The Author(s).

语种： 英文

作者： Zhu, Qiancheng;Zhao, Danyang;Cheng, Mingyu;Zhou, Jianqing;Owusu, Kwadwo Asare;...

期刊： Advanced Energy Materials,2019年9(36):1901081- ISSN：1614-6832

通讯作者： Yu, Ying;Mai, Liqiang

作者机构： [Zhu, Qiancheng; Zhao, Danyang; Yu, Ying; Cheng, Mingyu; Zhou, Jianqing] Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan 430079, Hubei, Peoples R China.;[Mai, Liqiang; Owusu, Kwadwo Asare] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Hubei, Peoples R China.

通讯机构： [Yu, Ying] C;[Mai, Liqiang] W;Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan 430079, Hubei, Peoples R China.;Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Hubei, Peoples R China.

关键词： asymmetric and symmetric supercapacitors;integrated supercapacitors;multiple mechanisms

摘要： Charging times ranging from seconds to minutes with high power densities can be achieved by electrochemical capacitors in principle. Over the past few decades, the performance of supercapacitors has been greatly improved by the utilization of new materials, preparation of unique nanostructures, investigation of electrolytes, and so on. However, the discovery of the related basic theory is very limited. Herein, a new view of a supercapacitor called the “integrated supercapacitor” is proposed. The electrode of the integrated supercapacitor consists of certain positive and negative materials. With this design, a single integrated electrode can work in both the positive and negative potential windows simultaneously. Additionally, the integrated full supercapacitor device shows a much higher capacitance and wider potential window than traditional single symmetric and asymmetric supercapacitors, which results from its multiple mechanisms, including the traditional positive//positive symmetric, positive//negative asymmetric, and negative//negative symmetric full supercapacitor mechanisms. © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

语种： 英文

作者： Hu, Hao;Zhao, Bote;Cheng, Haoyan;Dai, Shuge;Kane, Nicholas;...

期刊： Nano Energy,2019年57:635-643 ISSN：2211-2855

通讯作者： Liu, Meilin;Yu, Ying

作者机构： [Liu, Meilin; Zhao, Bote; Kane, Nicholas; Dai, Shuge; Hu, Hao] Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA.;[Hu, Hao; Cheng, Haoyan; Yu, Ying] Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nano Sci & Nano Technol, Wuhan 430079, Hubei, Peoples R China.

通讯机构： [Liu, Meilin] G;[Yu, Ying] C;Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA.;Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nano Sci & Nano Technol, Wuhan 430079, Hubei, Peoples R China.

关键词： Lithium-organosulfur battery;Organic polysulfane;Polymer nanosheet;Surface enhanced Raman scattering

摘要： Organic polysulfanes are new type of attractive organosulfur electrode materials for next generation lithium-sulfur (Li-S) batteries because of their high sulfur content, low cost, and desirable energy density. However, conventional organic polysulfanes usually suffer from poor reversibility due to structure variation and irreversible conversion during cycling. Here we report the synthesis and characterization of a novel two-dimensional (2D) organic polysulfane with a unique molecular structure of polycyclic sulfur directly substituting the carboxyls of poly(acrylic acid) and grafted on the carbon chain through a coupling reaction with KI as a catalyst and KCl as a template. The obtained organic polysulfane nanosheets with 72 wt% sulfur (OPNS-72) exhibit high initial capacity of 891 mAh/g (based on whole composite), excellent cycling stability (0.014% capacity fading per cycle over 620 cycles at 1 C rate), superior rate capability (562 mAh/g at 10 C) and high mass loading of 9.7 mg/cm 2 . The remarkable cycling stability of the Li-S battery is attributed to the structural stability and highly reversible electrochemical reaction of the OPNS-72 electrode, as confirmed by the TEM image after cycling and operando Raman spectroscopy measurements under battery operating conditions. Further, the developed synthesis approach is applicable for the preparation of other organic polysulfane nanosheets as highly reversible electrodes for Li-S batteries. © 2019 Elsevier Ltd

语种： 英文

作者： Zhou, Jianqing;Yu, Luo;Zhu, Qiancheng;Huang, Chuqiang;Yu, Ying*

期刊： Journal of Materials Chemistry A,2019年7(30):18118-18125 ISSN：2050-7488

通讯作者： Yu, Ying

作者机构： [Zhu, Qiancheng; Huang, Chuqiang; Yu, Ying; Yu, Luo; Zhou, Jianqing] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Hubei, 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, Wuhan 430079, Hubei, Peoples R China.

摘要： Water electrolysis utilizing renewable electricity power is a promising technology to produce green hydrogen energy on a large scale. However, this energy conversion technology is seriously hindered by the high activation barrier of the oxygen evolution reaction (OER), which requires highly active and robust electrocatalysts. Herein, we have developed a novel three-dimensional (3D) core-shell OER electrocatalyst, in which defective and ultrathin NiFe layered double hydroxide (NiFe LDH) nanosheets are rationally decorated on V-doped Ni3S2 nanorod arrays supported on Ni foam (V-Ni3S2@NiFe LDH). The highly conductive V-doped Ni3S2 nanorod cores ensure rapid charge transfer, and the ultrathin NiFe LDH nanosheets with rich defects offer numerous exposed active sites, together with the unique 3D core-shell nanostructures that benefit electrolyte diffusion and gas products releasing, thus our hierarchical catalyst is distinguished by very low overpotentials of 209 and 286 mV to obtain current densities of 10 and 100 mA cm-2, respectively, for OER in 1 M KOH. Impressively, when this 3D core-shell catalyst is paired with V-doped Ni3S2 nanorod arrays for overall water splitting, an outstanding two-electrode electrolyzer is achieved, which only requires 1.55 V to deliver a current density of 10 mA cm-2 in 1 M KOH, even superior to the benchmark of RuO2(+)//Pt(-). Our work provides a novel and effective strategy to rationally design efficient 3D hierarchical catalysts for energy conversion and storage. © 2019 The Royal Society of Chemistry.

语种： 英文