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Title: Quantum Effects on the Capacitance of Graphene-Based Electrodes

Journal Article · · Journal of Physical Chemistry. C

We recently measured quantum capacitance for electric double layers (EDL) at electrolyte/graphene interfaces. However, the importance of quantum capacitance in realistic carbon electrodes is not clear. Toward understanding that from a theoretical perspective, here we studied the quantum capacitance and total capacitance of graphene electrodes as a function of the number of graphene layers. The quantum capacitance was obtained from electronic density functional theory based on fixed band approximation with an implicit solvation model, while the EDL capacitances were from classical density functional theory. We found that quantum capacitance plays a dominant role in total capacitance of the single-layer graphene both in aqueous and ionic-liquid electrolytes but the contribution decreases as the number of graphene layers increases. Moreover, the total integral capacitance roughly levels off and is dominated by the EDL capacitance beyond about four graphene layers. Finally, because many porous carbons have nanopores with stacked graphene layers at the surface, this research provides a good estimate of the effect of quantum capacitance on their electrochemical performance.

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:
1265780
Journal Information:
Journal of Physical Chemistry. C, Vol. 119, Issue 39; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 101 works
Citation information provided by
Web of Science

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Cited By (15)

Trade-off between quantum capacitance and thermodynamic stability of defected graphene: an implication for supercapacitor electrodes journal March 2018
Ultralow Impedance Graphene Microelectrodes with High Optical Transparency for Simultaneous Deep Two-Photon Imaging in Transgenic Mice journal June 2018
Route to achieving enhanced quantum capacitance in functionalized graphene based supercapacitor electrodes journal August 2019
Molecular understanding of charge storage and charging dynamics in supercapacitors with MOF electrodes and ionic liquid electrolytes journal February 2020
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
Theoretical Study on the Quantum Capacitance Origin of Graphene Cathodes in Lithium Ion Capacitors journal October 2018
The dielectric constant of a bilayer graphene interface journal January 2019
Substrate Effects in Graphene-Based Electric Double-Layer Capacitors: The Pivotal Interplays between Ions and Solvents journal September 2017
Computational Insights into Materials and Interfaces for Capacitive Energy Storage journal April 2017
Hunting ionic liquids with large electrochemical potential windows journal November 2018
Exploring doped or vacancy-modified graphene-based electrodes for applications in asymmetric supercapacitors journal January 2020
Morphological and Radio Frequency Characterization of Graphene Composite Films journal May 2018
Charge storage at the nanoscale: understanding the trends from the molecular scale perspective journal January 2017
Improving the Quantum Capacitance of Graphene-Based Supercapacitors by the Doping and Co-Doping: First-Principles Calculations journal August 2019

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