Electrochemical capacitance of NiO/Ru0.35V0.65O2 asymmetric electrochemical capacitor

被引:159
作者
Yuan, Chang-Zhou [1 ]
Gao, Bo [1 ]
Zhang, Xiao-Gang [1 ]
机构
[1] Nanjing Univ Aeronaut & Astronaut, Coll Mat Sci & Engn, Nanjing 210016, Peoples R China
基金
中国国家自然科学基金;
关键词
Ru0.35V0.65O2; NiO; hybrid electrochemical capacitor;
D O I
10.1016/j.jpowsour.2007.04.034
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
A designed asymmetric hybrid electrochemical capacitor was presented where NiO and Ru0.35V0.65O2 as the positive and negative electrode, respectively, both stored charge through reversible faradic pseudocapacitive reactions of the anions (OH-) with electroactive materials. And the two electrodes had been individually tested in 1 M KOH aqueous electrolyte to define the adequate balance of the active materials in the hybrid system as well as the working voltage of the capacitor based on them. The electrochemical tests demonstrated that the maximum specific capacitance and energy density of the asymmetric hybrid electrochemical capacitor were 102.6 Fg(-1) and 41.2 Wh kg(-1), respectively, delivered at a current density of 7.5 A cm(-2). And the specific energy density decreased to 23.0 Wh kg(-1) when the specific power density increased up to 1416.7 W kg(-1). The hybrid electrochemical capacitor also exhibited a good electrochemical stability with 83.5% of the initial capacitance over consecutive 1500 cycle numbers. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:606 / 612
页数:7
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