期刊
ELECTROCHEMISTRY COMMUNICATIONS
卷 13, 期 11, 页码 1221-1224出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2011.08.039
关键词
Electrochemical dilatometry; Carbide-derived carbons; Supercapacitors
资金
- Fluid Interface Reactions, Structures and Transport (FIRST) Center
- Energy Frontier Research Center
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [ERKCC61]
- Swiss National Science Foundation (SNSF) [200021_126855/1]
- Alexander von Humboldt Foundation
- Swiss National Science Foundation (SNF) [200021_126855] Funding Source: Swiss National Science Foundation (SNF)
The long life durability and extraordinary stability of supercapacitors are ascribed to the common concept that the charge storage is purely based on double-layer charging. Therefore the ideal supercapacitor electrode should be free of charge induced microscopic structural changes. However, recent in-situ investigations on different carbon materials for supercapacitor electrodes have shown that the charge and discharge is accompanied by dimensional changes of the electrode up to several percent. This work studies the influence of the pore size on the expansion behavior of carbon electrodes derived from titanium carbide-derived carbons with an average pore size between 5 and 8 angstrom. Using tetraethylammonium tetrafluoroborate in acetonitrile, the swelling of the electrodes was measured by in situ dilatometry. The experiments revealed an increased expansion on the negatively charged electrode for pores below 6 angstrom, which could be described with pore swelling. (C) 2011 Elsevier B.V. All rights reserved.
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