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《能源化学(英文版)》 2019-08
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Exploring NiCo_2S_4 nanosheets arrays by hydrothermal conversion for enhanced high-rate batteries

Jianbo Wu;Xiaohua Huang;Xinhui Xia;Zhejiang Provincial Key Laboratory for Cutting Tools, Taizhou University;Department of Materials Science and Engineering, Zhejiang University;Institute of Advanced Electrochemical Energy, Xi’an University of Technology;  
Highly cross-linked porous NiCo_2S_4 nanosheets arrays are synthesized by a high-efficiency hydrothermal conversion from the preformed electrodeposited NiCo_2O_4 arrays. By using thioacetamide as the sulfur source, the electrodeposited NiCo_2O_4 is directly converted into NiCo_2O_4 nanosheets arrays without hightemperature sulfurization. Higher porosity and better electrical conductivity are obtained for the NiCo_2O_4 nanosheets arrays. In addition, reduced diffusion paths of electrons/ions and alleviated volume expansion during cycling are achieved due to the unique porous structure of NiCo_2S_4. Consequently, as the cathode of alkaline batteries, the obtained NiCo_2S_4 nanosheets arrays show better electrochemical performance with a high specific capacity(83.5 m Ah g~(-1) at 0.5 A g~(-1)) and better cycling stability(capacity retention of 93% after 5000 cycles) than the NiCo_2O_4 counterpart arrays(40.3 mAh g~(-1) at 0.5 A g~(-1)). Our work demonstrates that sulfurization on binary metal oxides can greatly enhance electrochemical performance and shows a new way for construction of advanced electrodes for high-rate batteries.
【Fund】: financial support from National Natural Science Foundation of China(Grant No.51502188);; Science and Technology Program of Taizhou(Grant No.14GY03);; Excellent Young Scientists Fund of Taizhou University(Grant No.2017JQ004);; supported by National Natural Science Foundation of China(Grant No.51772272 51502263 and 51728204);; Fundamental Research Funds for the Central Universities(Grant No.2018QNA4011);; Qianjiang Talents Plan D(QJD1602029);; Startup Foundation for Hundred-Talent Program of Zhejiang University
【CateGory Index】: TB383.1;TM911.14
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