Electrochemical capacitance of mesoporous tungsten oxynitride in aqueous electrolytes

被引：46
|
作者：
Kartachova, Olga [1 ]
Glushenkov, Alexey M. [1 ]
Chen, Yanhui [2 ]
Zhang, Hongzhou [2 ]
Dai, Xiujuan J. [1 ]
Chen, Ying [1 ]
机构：
[1] Deakin Univ, IFM, Waurn Ponds, Vic 3216, Australia
[2] Trinity Coll Dublin, CRANN, Sch Phys, Dublin 2, Ireland
来源：
JOURNAL OF POWER SOURCES | 2012年 / 220卷
基金：
爱尔兰科学基金会;
关键词：
Supercapacitors; Pseudocapacitance; Cyclic stability; Oxynitrides; Aqueous electrolytes; CHARGE-STORAGE PROPERTIES; MANGANESE-DIOXIDE; HALIDE APPROACH; ENERGY-STORAGE; SUPERCAPACITORS; MNO2; NITRIDE; OXIDE; ULTRACAPACITORS; TRANSITION;
D O I：
10.1016/j.jpowsour.2012.07.132
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：
Transition metal nitrides and oxynitrides are promising candidates for the application in electrodes of supercapacitors. In this manuscript characterization of tungsten oxynitride and its electrochemical properties in a range of aqueous electrolytes (1 M H2SO4, 1 M KOH, 3 M KCl, 3 M NaCl, 1 M LiCl and 1 M CaCl2) are presented. The electrochemical behavior of tungsten oxynitride depends strongly on the type of cation present in the electrolyte, and the highest capacitance value of 85 F g(-1) is measured in 1 M H2SO4. Cyclic stability in the acid, neutral and alkaline electrolytes is evaluated, and the highest stability is observed in 1 M KOH electrolyte. Possible charge-discharge mechanisms are discussed, and the contribution of a pseudocapacitive mechanism in addition to the electric double-layer formation is proposed. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：298 / 305
页数：8
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