期刊
ELECTROCHEMISTRY COMMUNICATIONS
卷 34, 期 -, 页码 196-199出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2013.06.011
关键词
Electrochemical dilatometry; Ionic liquid; Electrical double layer capacitor; Porous amorphous carbon; Carbide-derived carbon
资金
- Johann von Seidlitz Fellowship from University of Tartu Foundation
- European Social Fund's (ESF) Doctorial Studies and Internationalisation Programme DoRa
- ESF [1.2.0401.09-0079]
- German Federal Ministry for Research and Education (BMBF) [03EK3013]
In situ electrochemical dilatometry was used to study, for the first time, the expansion behavior of a porous carbon electrode in a pure ionic liquid, 1-ethyl-3-methyl-imidazolium-tetrafluoroborate. For a single electrode, an applied potential of -2 V and +2 V against the potential of zero charge resulted in maximum strains of 1.8% and 0.5%, respectively. During cyclic voltammetry, the characteristic expansion behavior strongly depends on the scan rate, with increased scan rates leading to a decrease of the expansion. Chronoamperometry was used to determine the equilibrium specific capacitance and expansion. The obtained strain versus accumulated charge relationship can be fitted with a simple quadratic function. Cathodic and anodic expansion data collapse on one parabola when normalizing the surface charge by the ratio of ion volume and average pore size. There is also a transient spike in the height change when polarity is switched from positive to negative that is not observed when changing the potential from negative to positive indicating the size and the shape of the ion is influencing the expansion behavior. (C) 2013 Elsevier B.V. All rights reserved.
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