Influence of chemical modification of activated carbon surface on characteristics of supercapacitors

被引：20

作者：

Bakhmatyuk, B. P. ^{[1
]}

Venhryn, B. Ya. ^{[1
]}

Grygorchaka, I. I. ^{[1
]}

Micov, M. M. ^{[2
]}

机构：

[1] Lviv Polytech Natl Univ, UA-79013 Lvov, Ukraine

[2] Concern Hefra, Bratislava 84103, Slovakia

来源：

JOURNAL OF POWER SOURCES | 2008年 / 180卷 / 02期

关键词：

modified activated carbon; electrochemical impedance spectroscopy; supercapacitor; X-ray photoelectron spectroscopy; specific capacitance; specific energy;

D O I：

10.1016/j.jpowsour.2008.02.045

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：

The influence of the change of Fermi level electrons position of activated carbon mu(C) caused by chemical modification of its porous surface by Mn2+ ions on its capacitive characteristics in 7.6 m KOH, 4 m KI, 2 m Znl(2) aqueous solutions is investigated in this work. The detection of adsorbed Mn2+ ions on the surface of activated carbon was carried out according to methods of secondary ionic mass spectrometry (SIMS). An increase in electronic density on the Fermi level of modified with Mn2+ activated carbon was determined with a help of X-ray photoelectron spectroscopy (XPS) data. Capacitive characteristics of the electrodes have been investigated by means of electrochemical impedance spectroscopy, computer modeling, and galvanic discharge. The correlation between electronic structure of modified activated carbon (MAC) and thermodynamic characteristics of ions of the used electrolytes is established. On the basic of the obtained experimental data, electrochemical system of the hybrid capacitor with a specific capacitance of 1740 Fg(-1) and with a specific energy of 30 mWh g(-1) is developed. (C) 2008 Published by Elsevier B.V.

引用

页码：890 / 895

页数：6

共 24 条

[1] On the hierarchy of the influences of porous and electronic structures of carbonaceous materials on parameters of molecular storage devices [J].