Monovalent silicotungstate salts as electrolytes for electrochemical supercapacitors

被引：19

作者：

Gao, Han ^{[1
]}

Virya, Alvin ^{[1
]}

Lian, Keryn ^{[1
]}

机构：

[1] Univ Toronto, Dept Mat Sci & Engn, Toronto, ON M5S 3E4, Canada

来源：

ELECTROCHIMICA ACTA | 2014年 / 138卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

electrical double layer capacitor; neutral aqueous electrolytes; alkali cations; heteropolyacid salts; ACTIVATED CARBON; HETEROPOLY COMPOUNDS; ACID ELECTROLYTES; DOUBLE-LAYER; CAPACITORS;

D O I：

10.1016/j.electacta.2014.06.127

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Lithium, sodium, and potassium salts of silicotungstic acid were synthesized and characterized as aqueous neutral electrolytes for electrochemical supercapacitors. The acidity of the aqueous solution and the structure of the solid-state anion were examined to confirm the presence of SiW salts. Ionic conductivity and the electrochemical stability potential window were characterized and compared to a silicotungstic acid solution using metallic blocking electrodes. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were used to investigate the performance of carbon EDLC cells enabled by the neutral electrolytes and revealed a 1.5 V cell voltage and good cycle life. The similarities and differences among the three salts are explained based on the properties of cations in these neutral electrolytes. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：240 / 246

页数：7

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