The effect of the ionic size of small quaternary ammonium BF4 salts on electrochemical double layer capacitors

被引：70

作者：

Koh, Ah Reum ^{[1
]}

Hwang, Byunghyun ^{[1
]}

Roh, Kwang Chul ^{[2
]}

Kim, Ketack ^{[1
]}

机构：

[1] Sangmyung Univ, Dept Chem, Seoul 110743, South Korea

[2] Korea Inst Ceram & Engn & Technol, Div Energy & Environm, Seoul 153801, South Korea

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2014年 / 16卷 / 29期

基金：

新加坡国家研究基金会;

关键词：

CARBON ELECTRODES; PORE STRUCTURE; PERFORMANCE; ELECTROLYTES; INSIGHTS; BEHAVIOR; GRAPHENE; LIQUID;

D O I：

10.1039/c4cp00949e

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：

By varying the cation size of quaternary ammonium salts, approximately 10% higher capacitance was achieved with trimethylethylammonium BF4 and trimethylpropylammonium BF4 relative to tetraethylammonium BF4 using microporous activated carbon (AC) electrodes. The ions carried solvation shells in the bulk electrolytes, but became desolvated within the narrow AC pores when the electrochemical double-layer capacitor was charged to a high potential. The capacitance depended on the size of the cation rather than that of the BF4 anion because the anion is smaller than the quaternary ammonium ions. The capacitance was found to be proportional to the reciprocal radii of the neat cations. The effective radius of the asymmetric trimethylpropylammonium ion was estimated to be 0.314 nm based on the present results.

引用

页码：15146 / 15151

页数：6

共 29 条

[1] High temperature carbon-carbon supercapacitor using ionic liquid as electrolyte [J].