Statically deposited nanostructured CoxNi1-x layered double hydroxides as electrode materials for redox-supercapacitors

被引：278

作者：

Gupta, Vinay ^{[1
,2
]}

Gupta, Shubhra ^{[1
]}

Miura, Norio ^{[1
]}

机构：

[1] Kyushu Univ, Art Sci & Technol Ctr Cooperat Res, Kasuga, Fukuoka 8168580, Japan

[2] Japan Sci & Technol Agcy, Kawaguchi, Saitama 3320012, Japan

来源：

JOURNAL OF POWER SOURCES | 2008年 / 175卷 / 01期

基金：

日本科学技术振兴机构;

关键词：

COxNi1-x LDHs; potentiostatic deposition; specific capacitance; supercapacitor;

D O I：

10.1016/j.jpowsour.2007.09.004

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：680 / 685

页数：6

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