Effects of surface chemical properties of activated carbon modified by amino-fluorination for electric double-layer capacitor

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• 作者：Min-Jung Jung ; Euigyung Jeong ; Seho Cho ; Sang Young Yeo ; Young-Seak Lee
• 关键词：Activated carbon ; Surface modification ; Amino-fluorination ; Electric double-layer capacitor
• 刊名：Journal of Colloid and Interface Science
• 出版年：2012
• 出版时间：1 September, 2012
• 年：2012
• 卷：381
• 期：1
• 页码：152-157
• 全文大小：445 K

文摘

The surface of phenol-based activated carbon (AC) was seriatim amino-fluorinated with solution of ammonium hydroxide and hydrofluoric acid in varying ratio to fabricate electrode materials for use in an electric double-layer capacitor (EDLC). The specific capacitance of the amino-fluorinated AC-based EDLC was measured in a 1 M H₂SO₄ electrolyte, in which it was observed that the specific capacitances increased from 215 to 389 F g^?1 and 119 and 250 F g^?1 with the current densities of 0.1 and 1.0 A g^?1, respectively, in comparison with those of an untreated AC-based EDLC when the amino-fluorination was optimized via seriatim mixed solution of 7.43 mol L^?1 ammonium hydroxide and 2.06 mol L^?1 hydrofluoric acid. This enhancement of capacitance was attributed to the synergistic effects of an increased electrochemical activity due to the formation of surface N- and F-functional groups and increased, specific surface area, and mesopore volumes, all of which resulted from the amino-fluorination of the electrode material.