Potentiostatically deposited nanostructured CoxNi1−x layered double hydroxides as electrode materials for redox-supercapacitors |
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| Authors: | Vinay Gupta Shubhra Gupta Norio Miura |
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| Affiliation: | 1. Art, Science and Technology Center for Cooperative Research, Kyushu University, Kasuga-shi, Fukuoka 816-8580, Japan;2. Japan Science and Technology Agency, Kawaguchi-shi, Saitama 332-0012, Japan |
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| Abstract: | Cobalt–nickel layered double hydroxides (CoxNi1−x LDHs) were deposited onto stainless steel electrodes by the potentiostatic deposition method at −1.0 V vs. Ag/AgCl using various molar ratios of Co(NO3)2 and Ni(NO3)2 in distilled water. Their structure and surface morphology were studied by using X-ray diffraction analysis, energy dispersive X-ray spectroscopy and scanning electron microscopy. A network of CoxNi1−x LDH nanosheets was obtained. The nature of the cyclic voltammetry and charge–discharge curves suggested that the CoxNi1−x LDHs exist in the form of solid solutions. The capacitive characteristics of the CoxNi1−x LDHs in 1 M KOH electrolyte showed that Co0.72Ni0.28 LDHs had the highest specific capacitance value, 2104 F g−1, which is also the highest yet reported value for oxide materials in general. |
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| Keywords: | CoxNi1&minus x LDHs Potentiostatic deposition Specific capacitance Supercapacitor |
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