期刊
JOURNAL OF POWER SOURCES
卷 253, 期 -, 页码 205-213出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2013.12.073
关键词
Nickel-cobalt hydroxide; Cathodic deposition; Porous nanonetwork; Superior capacitive performances; Asymmetric supercapacitor
资金
- National Science Council of ROC Taiwan [NSC-102-2221-E-007-120-MY3, 102-3113-P-006-012, 102-3113-P-194-003, 101-2221-E-007-112-MY3]
- Delta-NTHU research program
- Low Carbon Energy Research Center of National Tsing Hua University
Binary nickel-cobalt hydroxides (denoted as NixCo1-x(OH)(2)) with advanced capacitive performances, such as the superior rate capability, energy efficiency, and capacitance rate-/cycle-retention, are synthesized by cathodic deposition. The effects of deposition variables are systematically investigated and discussed. The deposition current density has been found to determine the morphology of hydroxides whereby a small current density facilitates the formation of porous nanonetwork microstructures. Both pH and temperature of the precursor solution affect the Co/Ni ratio of hydroxides, which in turn influence the capacitive performances. Eventually, Ni0.32Co0.68(OH)(2) synthesized under our proposed deposition condition exhibits a specific capacitance value of ca. 1000 F g(-1) at 5 mV s(-1), 100% capacitance cycle-retention over 1000 cycles, and 69% capacitance rate-retention (varying from 5 to 500 mV s(-1)). These superior capacitive performances make Ni0.32Co0.68(OH)(2) a promising material of the positive electrode for an asymmetric supercapacitor with an energy efficiency of 90% at 10 A g(-1). (C) 2013 Elsevier B.V. All rights reserved.
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