期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 7, 期 5, 页码 789-794出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.6b00047
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资金
- Fluid Interface Reactions, Structures, and Transport (FIRST) Center, an Energy Frontier Research Center - U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences
- Office of Science of the U.S. Department of Energy [DE-AC02-05CH11231]
We apply joint density functional theory (JDFT), which treats the electrode/electrolyte interface self-consistently, to an electric double-layer capacitor (EDLC) based on few-layer graphene electrodes. The JDFT approach allows us to quantify a third contribution to the total capacitance beyond quantum capacitance (C-Q) and EDL capacitance (C-EDL). This contribution arises from the dielectric screening of the electric field by the surface of the few-layer graphene electrode, and we therefore term it the dielectric capacitance (C-Dielec). We find that C-Dielec becomes significant in affecting the total capacitance when the number of graphene layers in the electrode is more than three. Our investigation sheds new light on the significance of the electrode dielectric screening on the capacitance of few-layer graphene electrodes.
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