期刊
JOURNAL OF ENERGY CHEMISTRY
卷 35, 期 -, 页码 132-137出版社
ELSEVIER
DOI: 10.1016/j.jechem.2018.11.007
关键词
Porous materials; Thin films; Alkaline batteries; Metal oxides; Energy storage and conversion
资金
- National Natural Science Foundation of China [51772272, 51502263, 51728204]
- Science and Technology Program of Taizhou [14GY03]
- Excellent Young Scientists Fund of Taizhou University [2017JQ004]
- Fundamental Research Funds for the Central Universities [2018QNA4011]
- Qianjiang Talents Plan D [QJD1602029]
- Startup Foundation for Hundred-Talent Program of Zhejiang University
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 NiCo2S4 is directly converted into NiCo2S4 nanosheets arrays without high-temperature sulfurization. Higher porosity and better electrical conductivity are obtained for the NiCo2S4 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 mAh g(-1) at 0.5 A g(-1)) and better cycling stability (capacity retention of 93% after 5000 cycles) than the NiCo2S4 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. (C) 2018 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.
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