Exploring NiCo2S4 nanosheets arrays by hydrothermal conversion for enhanced high-rate batteries

作     者：Jianbo Wu Xiaohua Huang Xinhui Xia Jianbo Wu;Xiaohua Huang;Xinhui Xia

作者机构：Zhejiang Provincial Key Laboratory for Cutting Tools Taizhou UniversityTaizhou 318000 Zhejiang China Department of Materials Science and Engineering Zhejiang UniversityHangzhou 310027Zhejiang China Institute of Advanced Electrochemical Energy Xi'an University of TechnologyXi'an 710048 Shaanxi China 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2019年第28卷第8期

页      面：132-137,I0005页

核心收录：

学科分类：0820[工学-石油与天然气工程] 0808[工学-电气工程] 07[理学] 0817[工学-化学工程与技术] 0807[工学-动力工程及工程热物理] 0827[工学-核科学与技术] 0703[理学-化学] 0702[理学-物理学] 

基　　金：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 

主　　题：Porous materials Thin films Alkaline batteries Metal oxides Energy storage and conversion 

摘      要：Highly cross-linked porous NiCo2S4 nanosheets arrays are synthesized by a high-efficiency hydrothermal conversion from the preformed electrodeposited NiCo2O4 arrays. By using thioacetamide as the sulfur source, the electrodeposited NiCo2O4 is directly converted into NiCo2O4 nanosheets arrays without hightemperature sulfurization. Higher porosity and better electrical conductivity are obtained for the NiCo2O4 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 NiCo2S4. Consequently, as the cathode of alkaline batteries, the obtained NiCo2S4 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 NiCo2O4 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.