A Search for Short-term Hard X-Ray Bursts in the Direction of the Repeating FRB 121102
作者：
Sun, Shangyu
* ;Yu, Wenfei;Yu, Yunwei
（ ;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.
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英文
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A universal synthesis strategy to make metal nitride electrocatalysts for hydrogen evolution reaction
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.
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英文
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Non-noble metal-nitride based electrocatalysts for high-performance alkaline seawater electrolysis
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
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Visible-light responsive boron and nitrogen codoped anatase TiO 2 with exposed {0 0 1} facet: Calculation and experiment
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
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Defective and ultrathin NiFe LDH nanosheets decorated on V-doped Ni3S2 nanorod arrays: A 3D core-shell electrocatalyst for efficient water oxidation
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
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Electrolyzer with hierarchical transition metal sulfide and phosphide towards overall water splitting
作者：
Huang, C.;Cheng, S.;Yu, L.;Zhang, W.;Zhou, J.;...
期刊：
Materials Today Physics ,2019年11:100162 ISSN：2542-5293
通讯作者：
Yu, Y.
作者机构：
[Yu, Y.; Cheng, S.; Huang, C.; Yu, L.; Zhang, W.; Zhou, J.; Zhang, Y.] Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan 430079, Peoples R China.;[Yu, L.] Univ Houston, Dept Phys, Houston, TX 77204 USA.;[Yu, L.] Univ Houston, TcSUH, Houston, TX 77204 USA.
通讯机构：
[Yu, Y.] C;Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan 430079, Peoples R China.
关键词：
Active sites;Cu3P@Co2P;CuS@CoS2;Intrinsic activity;Water splitting
摘要：
Transition metal sulfide (TMS) and phosphide (TMP) have been considered as efficient catalysts for electrochemical water splitting. Here, we have reported an effective strategy to synthesize TMS- and TMP-assembled hierarchical anode (CuS@CoS2) and cathode (Cu3P@Co2P) for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), respectively. It is found that the three-dimensional (3D) hierarchical electrodes not only provide a large number of active sites to promote the apparent catalytic activity, but also present tuned valence state of Co, which enhances the intrinsic activity of the active sites. Therefore, the CuS@CoS 2 anode possesses excellent OER activity with an overpotential of 230 mV at a current density of 10 mA/cm(2), and the Cu3P@Co2P cathode exhibits good HER performance with a low overpotential of 95 mV at a current density of 10 mA/cm(2). Impressively, the CuS@CoS2//Cu3P@Co2P electrolyzer deliver a current density of 10 mA/cm(2) at a cell voltage of 1.55 V for overall water splitting, which is better than most reported TMS and TMP based catalysts. (C) 2019 Elsevier Ltd. All rights reserved.
语种：
英文
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Nickel phosphide based hydrogen producing catalyst with low overpotential and stability at high current density
作者：
Chen, Weiwu;Mishra, Ishwar Kumar;Qin, Zhaojun;Yu, Luo;Zhou, Haiqing;...
期刊：
Electrochimica Acta ,2019年299:756-761 ISSN：0013-4686
通讯作者：
Wang, Zhiming M.;Song, Hai-Zhi;Ren, Zhifeng
作者机构：
[Wenya, Gideon Evans; Wang, Zhiming M.; Chen, Weiwu; Qin, Zhaojun; Song, Hai-Zhi] Univ Elect Sci & Technol China, Inst Fundamental & Frontier Sci, Chengdu 610054, Sichuan, Peoples R China.;[Chen, Weiwu; Mishra, Ishwar Kumar; Zhang, Fanghao; Zhou, Haiqing; Chen, Shuo; Yu, Luo; Sun, Jingying; Ren, Zhifeng] Univ Houston, Dept Phys, Houston, TX 77204 USA.;[Chen, Weiwu; Mishra, Ishwar Kumar; Zhang, Fanghao; Zhou, Haiqing; Chen, Shuo; Yu, Luo; Sun, Jingying; Ren, Zhifeng] Univ Houston, TcSUH, Houston, TX 77204 USA.;[Yu, Ying; Yu, Luo] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Hubei, Peoples R China.;[Zhou, Haiqing] Hunan Normal Univ, Dept Phys, Changsha 410081, Hunan, Peoples R China.
通讯机构：
[Wang, ZMM; Song, HZ; Ren, Zhifeng] U;Univ Elect Sci & Technol China, Inst Fundamental & Frontier Sci, Chengdu 610054, Sichuan, Peoples R China.;Univ Houston, Dept Phys, Houston, TX 77204 USA.;Univ Houston, TcSUH, Houston, TX 77204 USA.
关键词：
Ni5P4/NiP2;Water splitting;Hierarchical;HER;Electrocatalysts
摘要：
Hydrogen has promise as a good future alternative to fossil fuels. Electrochemical water splitting is an environmentally friendly way to produce hydrogen, but high overpotentials and cost are the main limitations to the application of electrocatalysts in large-scale hydrogen production. Here, an inexpensive catalyst composed of Ni5P4/NiP2 nanoparticles on Ni5P4/NiP2 nanosheets was prepared by a simple chemical vapor deposition method to increase the active catalytic sites. This nickel phosphide exhibits an overpotential of 35 mV at a current density of 10 mA cm(-2) in an acidic condition, outperforming other reported nickel phosphides. Additionally, it shows great stability at a high current density of 1200 mA cm(-2), which is very important for large-scale applications. Furthermore, this sample shows pH universality, with good performance in both acidic and alkaline electrolytes. This work advances nickel phosphide as an efficient catalyst for the hydrogen evolution reaction in water splitting. Published by Elsevier Ltd.
语种：
英文
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Self-supported ultrathin bismuth nanosheets acquired by: In situ topotactic transformation of BiOCl as a high performance aqueous anode material
作者：
Zhu, Qiancheng;Cheng, Mingyu;Yang, Xianfeng;Zhang, Bing;Wan, Zhanzi;...
期刊：
Journal of Materials Chemistry A ,2019年7(12):6784-6792 ISSN：2050-7488
通讯作者：
Yu, Ying
作者机构：
[Xiao, Qin; Zhu, Qiancheng; Zhang, Bing; Wan, Zhanzi; Yu, Ying; Cheng, Mingyu] Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan 430079, Hubei, Peoples R China.;[Yang, Xianfeng] South China Univ Technol, Analyt & Testing Ctr, Guangzhou 510640, Guangdong, 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.
摘要：
Aqueous rechargeable batteries are attractive because of their low cost, high operational safety and environmental benignity. Bismuth (Bi) with a highly reversible redox reaction and suitable negative working window has been investigated as a promising anode material recently. However, reported Bi anodes are still far from satisfactory because of their limited capacity and poor stability. Herein, self-supported ultrathin Bi nanosheets have been acquired by a very simple strategy of in situ topotactic transformation using BiOCl as the primary template (named T-BiNS). According to theoretical calculation, the space that T-BiNS has left after the release of O and Cl atoms is sufficient for the reversible charge/discharge process of Bi ↔ Bi2O3. The huge space and the unique structure enhance rapid electron transfer, reduce the activation energy and improve the stability. As such, T-BiNS shows a high capacity of 366 mA h g-1 (almost reaching a theoretical capacity of 384.7 mA h g-1) and good stability with a capacity retention of 82% after 5000 cycles. Finally, a NiCo2O4//T-BiNS full battery is fabricated, which exhibits a high energy density of 116 W h kg-1. © 2019 The Royal Society of Chemistry.
语种：
英文
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Visible-light driven CO2 reduction coupled with water oxidation on Cl-doped Cu2O nanorods
作者：
Yu, Luo;Ba, Xin;Qiu, Ming* ;Li, Yifei;Shuai, Ling;...
期刊：
Nano Energy ,2019年60:576-582 ISSN：2211-2855
通讯作者：
Qiu, Ming;Yu, Ying;Ren, Zhifeng
作者机构：
[Zhang, Wei; Ba, Xin; Li, Yifei; Yu, Ying; Yu, Luo; Shuai, Ling; Qiu, Ming] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Hubei, Peoples R China.;[Yu, Luo; Ren, Zhifeng] Univ Houston, Dept Phys, Houston, TX 77204 USA.;[Yu, Luo; Ren, Zhifeng] Univ Houston, TcSUH, Houston, TX 77204 USA.;[Ba, Xin] Hubei Inst Qual Supervis & Inspect, Wuhan 430061, Hubei, Peoples R China.
通讯机构：
[Qiu, M; Yu, Y] C;[Ren, Zhifeng] 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.
关键词：
Band structure;Cl-doped Cu 2 O;CO 2 reduction;Density functional theory;H 2 O oxidation;Visible-light irradiation
摘要：
Visible-light driven overall conversion of CO 2 and H 2 O into chemical fuels and O 2 is a challenging but promising reaction for artificial photosynthesis. Here we demonstrate Cl-doped Cu 2 O nanorods for photocatalytic CO 2 reduction conjugated with H 2 O oxidation under visible-light irradiation. Cl-doping optimizes the band structure of Cu 2 O, resulting in a more positive valence-band position for H 2 O oxidation, and promotes CO 2 adsorption capacity as well as separation and transfer efficiency of photogenerated charge carriers. Consequently, the Cl-doped Cu 2 O shows excellent photocatalytic CO 2 reduction performance accompanied by favorable H 2 O oxidation ability under visible-light irradiation. The best sample achieves an apparent quantum efficiency of 2.2% with 1.13% for CO and 1.07% for CH 4 at 400 nm and demonstrates superior stability. Density functional theory calculations further reveal that Cl-doped Cu 2 O is beneficial for the transformation of CO 2 into the intermediates of *COOH, *CO, and *CH 3 O, which contributes to the enhanced activity of CO and CH 4 production. Additionally, Cl-doped Cu 2 O shows stronger affinity toward the *CO intermediate, which tends to be protonated and ultimately transforms into CH 4 , leading to higher selectivity of CH 4 than that of pure Cu 2 O. This work validates an effective strategy to engineer Cu 2 O for visible-light driven overall conversion of CO 2 reduction and H 2 O oxidation. © 2019
语种：
英文
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A New View of Supercapacitors: Integrated Supercapacitors
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
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A robust 2D organic polysulfane nanosheet with grafted polycyclic sulfur for highly reversible and durable lithium-organosulfur batteries
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
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A novel H2O2-assisted method to fabricate Li4Ti5O12/TiO2 materials for high-performance energy storage
作者：
Zhou, Jianqing;Zhu, Qiancheng;Hu, Hao;Chen, Wenjuan;Yu, Ying*
期刊：
Electrochimica Acta ,2018年281:142-151 ISSN：0013-4686
通讯作者：
Yu, Ying
作者机构：
[Zhu, Qiancheng; Hu, Hao; Chen, Wenjuan; Yu, Ying; Zhou, Jianqing] 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：
Hydrogen peroxide;Spinel Li4Ti5O12;Commercial titania;Low temperature;Energy storage
摘要：
Spinel Li4Ti5O12 known as a "zero-strain" anode material for Li-ion battery has attracted much attention because of its superior safety and stability. Herein, we report a novel H2O2-assisted one-step hydrothermal method to synthesize different ratio Li4Ti5O12/TiO2 composites with the same amount of raw materials. For the first time, Li4Ti5O12 was prepared directly from commercial titania with the presence of H2O2, and different proportion Li4Ti5O12/TiO2 composites were fabricated only by adjusting the amount of H2O2. The reaction mechanism of the novel H2O2-assisted method was clearly investigated, and H2O2 plays a crucial role in the formation of intermediate Li1.81H0.19Ti2O5 center dot 2H(2)O. Further, the electrochemical performance of different ratio Li4Ti5O12/TiO2 composites have been investigated. This facile method is also applicable for the preparation of Na2Ti6O13/TiO2 material, and provides us the new way to fabricate composite materials. (c) 2018 Elsevier Ltd. All rights reserved.
语种：
英文
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Water splitting by electrolysis at high current densities under 1.6 volts
作者：
Zhou, Haiqing;Yu, Fang;Zhu, Qing;Sun, Jingying;Qin, Fan;...
期刊：
Energy & Environmental Science ,2018年11(10):2858-2864 ISSN：1754-5692
通讯作者：
Chen, Shuo;Ren, Zhifeng;Yu, Ying
作者机构：
[Zhou, Haiqing; Chen, Shuo; Chen, S; Ren, Zhifeng; Zhu, Qing; Sun, Jingying; Yu, Fang] Univ Houston, Dept Phys, Houston, TX 77204 USA.;[Zhou, Haiqing; Chen, Shuo; Chen, S; Ren, Zhifeng; Zhu, Qing; Sun, Jingying; Yu, Fang] Univ Houston, TcSUH, Houston, TX 77204 USA.;[Zhou, Haiqing; Yu, Fang] Hunan Normal Univ, Sch Phys & Elect, Minist Educ, Key Lab Low Dimens Quantum Struct & Quantum Contr, Changsha 410081, Hunan, Peoples R China.;[Qin, Fan; Bao, Jiming; Yu, Luo] Univ Houston, Dept Elect & Comp Engn, Houston, TX 77204 USA.;[Yu, Ying] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Hubei, Peoples R China.
通讯机构：
[Chen, S; Ren, ZF] U;[Yu, Ying] C;Univ Houston, Dept Phys, Houston, TX 77204 USA.;Univ Houston, TcSUH, Houston, TX 77204 USA.;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Hubei, Peoples R China.
摘要：
Splitting water into hydrogen and oxygen by electrolysis using electricity from intermittent waste heat, wind, or solar energies is one of the easiest and cleanest methods for high-purity hydrogen production and an effective way to store the excess electrical power. The key dilemma for efficient large-scale production of hydrogen by splitting of water via the hydrogen and oxygen evolution reactions (HER and OER, respectively) is the high overpotential required, especially for the OER. We report an exceptionally active and durable OER catalyst yielding current densities of 500 and 1000 mA cm-2 at overpotentials of only 259 mV and 289 mV in alkaline electrolyte, respectively, fulfilling the commercial criteria of the OER process. Together with a good HER catalyst, we have achieved the commercially required current densities of 500 and 1000 mA cm-2 at 1.586 and 1.657 V, respectively, with very good stability, dramatically lower than any previously reported voltage. This discovery sets the stage for large-scale hydrogen production by water splitting using excess electrical power whenever and wherever available. © 2018 The Royal Society of Chemistry.
语种：
英文
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Photocatalytic reduction of CO 2 to CO over copper decorated g-C 3 N 4 nanosheets with enhanced yield and selectivity
作者：
Shi, Guodong;Yang, Lin;Liu, Zhuowen;Chen, Xiao;Zhou, Jianqing;...
期刊：
Applied Surface Science ,2018年427:1165-1173 ISSN：0169-4332
通讯作者：
Yu, Ying
作者机构：
[Yang, Lin; Chen, Xiao; Yu, Ying; Shi, Guodong; Liu, Zhuowen; Zhou, Jianqing] 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：
CO 2 reduction;Cu decoration;g-C 3 N 4;Photocatalysis
摘要：
Photocatalytic reduction of CO 2 to fuel has attracted considerable attention due to the consumption of fossil fuels and serious environmental problems. Although there are many photocatalysts reported for CO 2 reduction, the improvement of activity and selectivity is still in great need of. In this work, a series of Cu nanoparticle decorated g-C 3 N 4 nanosheets with different Cu loadings were fabricated by a facile secondary calcination and subsequent microwave hydrothermal method. The designed catalysts shown good photocatalytic activity and selectivity for CO 2 reduction to CO. The optimal sample exhibited a 3-fold augmentation of the CO yield in comparison with pristine g-C 3 N 4 under visible light. It is revealed that with the loading of Cu nanoparticles, the resulting photocatalyst possessed an improved charge carrier transfer and separation efficiency as well as increased surface reactive sites, resulting in a significant enhancement of CO yield. It is anticipated that the designed Cu/C 3 N 4 photocatalyst may provide new insights for two dimensional layer materials and non-noble particles applied to CO 2 reduction. © 2017 Elsevier B.V.
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英文
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Hydrogen plasma reduced potassium titanate as a high power and ultralong lifespan anode material for sodium-ion batteries
作者：
Yang, Ze;Sun, Jingying;Xie, Yunlong;Kaur, Pawanjit;Hernandez, Joseph;...
期刊：
Journal of Materials Chemistry A ,2018年6(44):22037-22042 ISSN：2050-7488
通讯作者：
Chen, Shuo
作者机构：
[Kaur, Pawanjit; Chen, Shuo; Hernandez, Joseph; Yang, Ze; Sun, Jingying; Ni, Yizhou; Varghese, Oomman K.] Univ Houston, Dept Phys, Houston, TX 77204 USA.;[Chen, Shuo; Yang, Ze; Sun, Jingying; Ni, Yizhou] Univ Houston, Texas Ctr Superconduct, Houston, TX 77204 USA.;[Xie, Yunlong; Yu, Ying] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Hubei, Peoples R China.;[Huang, Yunhui] Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Die & Mould Technol, Sch Mat Sci & Engn, Wuhan 430074, Hubei, Peoples R China.
通讯机构：
[Chen, Shuo] U;Univ Houston, Dept Phys, Houston, TX 77204 USA.;Univ Houston, Texas Ctr Superconduct, Houston, TX 77204 USA.
摘要：
The abundance and low cost of sodium potentially enable application of sodium ion batteries for grid-scale energy storage. Consequently, anode materials with high power, long lifespan, and safe operation are highly desired. In this work, we successfully fabricate black K2Ti6O13 nanowires as an anode material that exhibits the desired properties. The black K2Ti6O13 nanowires are prepared via a hydrothermal method followed by post calcination and final hydrogen plasma treatment. The black K2Ti6O13 anode delivers a high reversible capacity of 249 mA h g−1. Impressively, it could sustain 20 000 cycles without apparent capacity fade. The first-principles calculation results suggest that the electrical conductivity of K2Ti6O13 would be improved while the sodiation energy barrier could be reduced after introducing oxygen vacancies. © The Royal Society of Chemistry.
语种：
英文
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Robust and selective electrochemical reduction of CO2: The case of integrated 3D TiO2@MoS2 architectures and Ti-S bonding effects
作者：
Yu, Luo;Xie, Yunlong* ;Zhou, Jianqing;Li, Yong;Yu, Ying* ;...
期刊：
Journal of Materials Chemistry A ,2018年6(11):4706-4713 ISSN：2050-7488
通讯作者：
Xie, Yunlong;Yu, Ying;Ren, Zhifeng
作者机构：
[Xie, YL; Yu, Ying; Xie, Yunlong; Li, Yong; Yu, Luo; Zhou, Jianqing] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Hubei, Peoples R China.;[Yu, Luo; Ren, Zhifeng] Univ Houston, Dept Phys, Houston, TX 77204 USA.;[Yu, Luo; Ren, Zhifeng] Univ Houston, TcSUH, Houston, TX 77204 USA.
通讯机构：
[Xie, YL; Yu, Y] C;[Ren, Zhifeng] 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：
Developing efficient and affordable catalysts toward electrochemical reduction of CO2 to valuable chemicals is of great significance for energy and environmental sustainability, which can be efficaciously achieved by catalyst structure steering. In this study, we propose an ingenious strategy to modulate MoS2 favorable for CO2 reduction by fabricating an integrated three-dimensional (3D) TiO2@MoS2 architecture containing Ti-S bonds, the formation of which, revealed by density functional theory calculations, has changed the electric properties of the MoS2 layer and the adsorption characters of Mo exposed edges. The modulated MoS2 is vigorous for CO2 reduction due to the decrease of both the binding energy of CO2 and the energy barriers of CO2 reduction reaction pathways. Experimentally, the integrated 3D TiO2@MoS2 architectures can act as efficient and stable catalysts for selective reduction of CO2 to CO. The optimized composite showed a negligible onset overpotential of 100 mV for CO formation in KHCO3 solution, and a maximum faradaic efficiency of ∼82% for CO at -0.7 V vs. RHE with a large partial current density for CO of 68 mA cm-2. Additionally, the integrated 3D electrodes exhibited superior stability during CO2 reduction. This study will shed light on the modification of electrocatalysts for efficient CO2 reduction through structure steering. © 2018 The Royal Society of Chemistry.
语种：
英文
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Synergistic effect of adsorption and visible-light photocatalysis for organic pollutant removal over BiVO4/carbon sphere nanocomposites
作者：
Wang, Xiaotong;Zhou, Jianqing;Zhao, Shuo;Chen, Xiao;Yu, Ying*
期刊：
Applied Surface Science ,2018年453:394-404 ISSN：0169-4332
通讯作者：
Yu, Ying
作者机构：
[Wang, Xiaotong; Chen, Xiao; Yu, Ying; Zhao, Shuo; Zhou, Jianqing] 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：
Adsorption kinetics;BiVO 4;Carbon sphere;Photocatalysis
摘要：
Photocatalysis and adsorption are considered as the effective methods to remove organic pollutants in wastewaters. In this study, a novel composite, BiVO 4 with reasonable bandgap (∼2.4 eV) and good photocatalytic performance combined with carbon sphere, is successfully prepared, which can be used to remove organic pollutants by the synergistic effect of adsorption and photocatalysis. In the composite, the carbon sphere has good ability to adsorb the pollutants, which is beneficial for them to be further photodegraded. Besides, it has good conductivity, which can facilitate the transfer of photogenerated electrons, thus reducing the recombination of photogenerated carriers for photocatalytic performance improvement. It is found that the composite with optimized ratio shows good adsorption and photocatalytic performance. The photodegradation rate for methylene blue over the best composite under visible-light irradiation is 11.56 times higher than that over pure BiVO 4 and that for rhodamine B is 4.42 times higher. The study provides a promising photocatalyst to be used for organic pollutant removal in large scale. © 2018 Elsevier B.V.
语种：
英文
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Amorphous NiFe layered double hydroxide nanosheets decorated on 3D nickel phosphide nanoarrays: a hierarchical core-shell electrocatalyst for efficient oxygen evolution
作者：
Yu, Luo;Zhou, Haiqing;Sun, Jingying;Mishra, Ishwar Kumar;Luo, Dan;...
期刊：
Journal of Materials Chemistry A ,2018年6(28):13619-13623 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; Mishra, Ishwar Kumar; Zhou, Haiqing; Chen, Shuo; Yu, Luo; Chen, S; Ren, Zhifeng; Sun, Jingying; Yu, Fang] Univ Houston, Dept Phys, 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, Wuhan 430079, Hubei, Peoples R China.;Univ Houston, Dept Phys, TcSUH, Houston, TX 77204 USA.
摘要：
The rational design of efficient and earth-abundant electrocatalysts for the oxygen evolution reaction (OER) plays a paramount role in hydrogen production by water electrolysis. Here we report a 3D hierarchical core-shell nanostructured OER electrocatalyst, in which amorphous NiFe layered double hydroxide (LDH) nanosheets are decorated on 3D conductive nickel phosphide nanoarrays. The integrated 3D core-shell electrode simultaneously offers excellent electrical conductivity for fast electron transfer, a large surface area with numerous active edge sites, and a hierarchical nanostructure for rapid release of gas bubbles, thus contributing to outstanding catalytic performance: low overpotentials (197, 243, and 283 mV for current densities of 10, 100, and 300 mA cm<sup>-2</sup>, respectively), a small Tafel slope (46.6 mV dec<sup>-1</sup>), and superior stability, which are better than those of almost all reported LDH-based OER catalysts. When this hybrid catalyst is combined with nickel phosphide for overall water splitting, the two-electrode cell achieves current densities of 10 mA cm<sup>-2</sup> at 1.52 V and 100 mA cm<sup>-2</sup> at 1.68 V in alkaline media, which are even superior to those of benchmark IrO<inf>2</inf> and Pt. This work paves an effective approach to design 3D hierarchical hybrid electrocatalysts for energy conversion and storage.<br/> ©The Royal Society of Chemistry.
语种：
英文
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Design of multidimensional nanocomposite material to realize the application both in energy storage and electrocatalysis
作者：
Qiancheng Zhu;Desheng Cai;Xiaoqin Lan;Guodong Shi;Kai Jin;...
期刊：
科学通报(英文版) ,2018年63(3):152-154 ISSN：2095-9273
通讯作者：
Yu, Ying(yuying01@mail.ccnu.edu.cn)
作者机构：
[Qiancheng Zhu; Wenjuan Chen; Guodong Shi; Ying Yu; Kai Jin; Xiaoqin Lan; Desheng Cai; Jianqing Zhou] Institute of Nanoscience and Nanotechnology, College of Physical Science and Technology, Central China Normal University, Wuhan, 430079, China
通讯机构：
[Ying Yu] I;Institute of Nanoscience and Nanotechnology, College of Physical Science and Technology, Central China Normal University, Wuhan 430079, China
关键词：
存储系统;精力;材料设计;应用程序;多维;锂离子电池;存储设备;电子学
摘要：
The development of clean, sustainable and renewable energy storage systems is in urgent need with the fast-growing energy demand in the areas of electric vehicles and mobile electronics etc. Lithium-ion batteries(LIBs) have been deemed to be the most promising energy storage devices for their high power density, long cycle life and fast charge-discharge rates. Transition metal oxides, such as FeO_x, CoO_x, NiO, MnO_2 and SnO_2 etc. have been intensively studied as promising anode materials due to their high theoretical specific capacities, environmental benignity and low cost. Recently, ternary metal oxides such as NiCo_2O_4, ZnCo_2O_4, CuCo_2O_4, and ZnMn_2O_4 etc. have been reported to exhibit high electrochemical activities because of their complex chemical composition and the synergic effects of multiple metal species. However, ternary metal oxides also have conductivity issue although their conductivity is better than nonmetal oxides. Some strategies have been performed to solve these problems by structure improvement and the incorporation of carbon nanotubes, graphene, and metal nanoparticles(NPs) and so on. But the capacity and especially the cycle performance for metal oxides or ternary metal oxides are still limited.
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英文
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用于CO2捕获和光催化转化的金属氧化物研究
作者：
余颖;朱前程;余罗;巴鑫
作者机构：
[余颖; 朱前程; 余罗; 巴鑫] 华中师范大学物理科学与技术学院纳米科技研究所
会议名称：
第十一届全国环境催化与环境材料学术会议
会议时间：
2018-07-20
会议地点：
中国辽宁沈阳
关键词：
CaO捕获剂;MgO改性;Cu2O光催化剂;性能增强
摘要：
<正>众所周知,将CO2进行捕获并将其转化为燃料是解决由温室效应引起的环境危机的有效途径,其中的关键是高效的捕获剂和催化剂研制。虽然相关领域已经有很多报导,但是现有捕获剂和催化剂的活性和稳定性离实际应用还有较远的距离。大量的研究表明金属氧化物如CaO是成本低廉、吸收CO2能力较强捕获剂,但是其吸收CO2的活性和循环稳定性还有待于提高,为了解决该问题,我们在制备出四种不同CaO的基础上,提出了
语种：
中文
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