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Title: Contribution of dielectric screening to the total capacitance of few-layer graphene electrodes

Journal Article · · Journal of Physical Chemistry Letters
 [1];  [1]
  1. Univ. of California, Riverside, CA (United States)

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 (CQ) and EDL capacitance (CEDL). 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 (CDielec). We find that CDielec becomes significant in affecting the total capacitance when the number of graphene layers in the electrode is more than three. In conclusion, our investigation sheds new light on the significance of the electrode dielectric screening on the capacitance of few-layer graphene electrodes.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Energy Frontier Research Centers (EFRC) (United States). Fluid Interface Reactions, Structures and Transport Center (FIRST)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1267032
Journal Information:
Journal of Physical Chemistry Letters, Vol. 7, Issue 5; ISSN 1948-7185
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 36 works
Citation information provided by
Web of Science

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Cited By (5)

Computational Insights into Materials and Interfaces for Capacitive Energy Storage journal April 2017
Evaluating continuum solvation models for the electrode-electrolyte interface: Challenges and strategies for improvement journal February 2017
A first-principles roadmap and limits to design efficient supercapacitor electrode materials journal January 2019
A comparative study of room temperature ionic liquids and their organic solvent mixtures near charged electrodes journal September 2016
The Influence of Anion Shape on the Electrical Double Layer Microstructure and Capacitance of Ionic Liquids-Based Supercapacitors by Molecular Simulations journal February 2017

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