Journal
JOURNAL OF POWER SOURCES
Volume 221, Issue -, Pages 128-133Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2012.07.111
Keywords
Cathodic deposition; Nickel hydroxide; Cobalt hydroxide; Supercapacitors; Asymmetric type
Funding
- 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
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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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