Electrochemical Quartz Crystal Microbalance Studies on the Storage Behavior of Ions at Activated Carbon Electrodes in NaClO4 Aqueous Solutions

doi:10.7503/cjcu20120955

Chem. J. Chinese Universities ›› 2013, Vol. 34 ›› Issue (7): 1743.doi: 10.7503/cjcu20120955

• Physical Chemistry • Previous Articles Next Articles

Electrochemical Quartz Crystal Microbalance Studies on the Storage Behavior of Ions at Activated Carbon Electrodes in NaClO₄ Aqueous Solutions

GAO Ji-Chao^1,2, YIN Jiao^1,2, QI Li¹, WANG Hong-Yu¹

1. Changchun Insititute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China

Received:2012-10-25 Online:2013-07-10 Published:2013-06-21
Contact: Hongyu Wang E-mail:hongyuwang@ciac.jl.cn

Abstract

Abstract:

Electrochemical quartz crystal microbalance(EQCM) was used to study the mass changes on activated carbon electrodes in various NaClO₄ aqueous solutions during the course of ions adsorption into the pores of the electrode. For each electrolyte solution, the hydration numbers of Na⁺ in the bulk solutions and at the electrode/solution interface were calculated from Raman and EQCM data, respectively. These two sets of hydration numbers of Na⁺ were compared and the desolvation effect of Na⁺ was investigated. Results indicate that the desolvation effect of Na⁺ is suppressed by increasing the concentrations of NaClO₄ aqueous solutions, which may be one of the main reasons for the improvement of the supercapacitors' power density. At the same time, results also prove that EQCM is an excellent tool for studies on ions' adsorption.

Key words: Electrochemical quartz crystal microbalance(EQCM), NaClO₄, Activated carbon, Electrochemical capacitor

CLC Number:

O646

TrendMD:

GAO Ji-Chao, YIN Jiao, QI Li, WANG Hong-Yu. Electrochemical Quartz Crystal Microbalance Studies on the Storage Behavior of Ions at Activated Carbon Electrodes in NaClO₄ Aqueous Solutions[J]. Chem. J. Chinese Universities, 2013, 34(7): 1743.

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Electrochemical Quartz Crystal Microbalance Studies on the Storage Behavior of Ions at Activated Carbon Electrodes in NaClO₄ Aqueous Solutions

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