期刊
ELECTROCHIMICA ACTA
卷 334, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.135559
关键词
Electrochemical conversion; Co(OH)(2)/CoOOH/Co3O4/Cu(OH)(2); Cu foam; Supercapacitor; Hydrothermal method
资金
- National Natural Science Foundation of China [51772148]
- Top-notch Academic Programs Project of Jiangsu Higher Education Institutions (TAPP) [PPZY2015B128]
- Postgraduate Research AMP
- Practice Innovation Program of Jiangsu Province [KYCX18_1086]
- Jiangsu Students' Platform for Innovation and Entrepreneurship Training Program [201910291025Z]
- Priority Academic ProgramDevelopment of Jiangsu Higher Education Institutions (PAPD)
Novel blanket-like Co(OH)(2)/CoOOH/Co3O4/Cu(OH)(2) composites on Cu foam are prepared through the electrochemical conversion of the precursors synthesized using hydrothermal method, named as CV sample. After the electrochemical conversion, flatbread-like precursors changes to blanket-like Co(OH)(2)/CoOOH/Co3O4/Cu(OH)(2) consisting of many nanowires. The CV sample has a specific area of 228.4 m(2) ga(-1), which is obviously larger than 24.5 m(2) ga(-1) for the precursors. The CV sample has a specific capacity of 290.8 mu Ah cm(-2) (1.94 F cm(-2)) at 1 mA cm(-2) and a capacity retention of 80.9% after 10000 cycles at 64 mA cm(-2). A hybrid supercapacitor consisting of CV sample as a positive electrode and heated carbon cloth as a negative electrode has an areal capacity of 245.1 mu Ah cm(-2) (0.552 F cm(-2)) at 2 mA cm(-2), an energy density of 196.1 mu W h cm(-2) at 1.6 mW cm(-2). The initial phase conversion from the precursors to Co(OH)(2)/CoOOH/Co3O4/Cu(OH)(2) induced by alkaline electrolyte resulted in smaller charge transfer and ion diffusion resistance, larger surface area, more active sites and better structural compatibility, which were demonstrated to be the critical factors for the capacity enhancement. (C) 2019 Elsevier Ltd. All rights reserved.
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