Al-substituted α-cobalt hydroxide synthesized by potentiostatic deposition method as an electrode material for redox-supercapacitors

被引：84

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 / 177卷 / 02期

基金：

日本科学技术振兴机构;

关键词：

cobalt hydroxide; aluminum hydroxide; potentiostatic deposition; specific capacitance; supercapacitor;

D O I：

10.1016/j.jpowsour.2007.10.091

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：

At-substituted a-cobalt hydroxide was prepared by a potentiostatic deposition process at - 1.0 V (vs. Ag/AgCl) onto stainless steel electrodes by using a mixed aqueous solution of cobalt nitrate and aluminum nitrate. Their structure and surface morphology were studied by using X-ray diffraction analysis, energy dispersive X-ray spectroscopy and scanning electron microscopy. The SEM images showed changes in the nanostructure of a-cobalt hydroxide by the addition of Al. Galvanostatic charge-discharge curves showed a drastic improvement in the capacitive characteristics of a-cobalt hydroxide, with a specific energy increase from 11.3 to 18.7 Wh kg(-1) by the substitution of just 8 at.% Al, and a specific capacitance of 843 F g(-1) between 0 and 0.4 V. The cycle stability data suggest no significant changes in the discharge characteristics of alpha-cobalt hydroxide by the addition of Al. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：685 / 689

页数：5

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