期刊
JOURNAL OF POWER SOURCES
卷 221, 期 -, 页码 128-133出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2012.07.111
关键词
Cathodic deposition; Nickel hydroxide; Cobalt hydroxide; Supercapacitors; Asymmetric type
资金
- Delta-NTHU collaboration program
- National Science Council of Taiwan [NSC100-2628-E-007-028-MY2]
- Low Carbon Energy Research Center of National Tsing Hua University
This work demonstrates the influences of electrochemical reversibility of the pseudocapacitive materials on the performances of an asymmetric supercapacitor consisting of a pseudocapacitive cathode and an anode of the double-layer type. Thanks for the simple, one-step, cathodic deposition of nickel and cobalt hydroxide (denoted as Ni(OH)(2) and Co(OH)(2), respectively) films from their chloride precursor in aqueous media with the addition of 40 mM NO3- as the OH-donating agent. The specific capacitances of Ni(OH)(2) and Co(OH)(2) films (ca. 0.4 mg cm(-2)) deposited at 1.0 mA cm(-2) for 1000 s are equal to 2217 and 549 F g(-1), respectively while the electrochemical reversibility of Co(OH)(2) is better than that of Ni(OH)(2) based on peak potential difference and symmetry of charge/discharge curves. The Co(OH)(2)-graphene asymmetric supercapacitor shows higher capacitance retention and higher energy efficiency of charge-discharge than the Ni(OH)(2)-graphene system although the latter system exhibits higher energy and power densities than the former one. The microstructures of as-deposited Ni(OH)(2) and Co(OH)(2) films have been examined by scanning electron microscopic (SEM), transmission electron microscopic (TEM), and X-ray diffraction (XRD) analyses. (C) 2012 Elsevier B.V. All rights reserved.
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