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Computational insight into the capacitive performance of graphene edge planes

Journal Article · · Carbon

Recent experiments have shown that electric double-layer capacitors utilizing electrodes consisting of graphene edge plane exhibit higher capacitance than graphene basal plane. However, theoretical understanding of this capacitance enhancement is still limited. Here we applied a self-consistent joint density functional theory calculation on the electrode/electrolyte interface and found that the capacitance of graphene edge plane depends on the edge type: zigzag edge has higher capacitance than armchair edge due to the difference in their electronic structures. We further examined the quantum, dielectric, and electric double-layer (EDL) contributions to the total capacitance of the edge-plane electrodes. Classical molecular dynamics simulation found that the edge planes have higher EDL capacitance than the basal plane due to better adsorption of counter-ions and higher solvent accessible surface area. Finally, our work therefore has elucidated the capacitive energy storage in graphene edge planes that take into account both the electrode's electronic structure and the EDL structure.

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) (SC-22)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1399371
Alternate ID(s):
OSTI ID: 1396886
Journal Information:
Carbon, Journal Name: Carbon Journal Issue: C Vol. 116; ISSN 0008-6223
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (10)

Design of Supercapacitor Electrodes Using Molecular Dynamics Simulations journal January 2018
Storing Energy in Biodegradable Electrochemical Supercapacitors journal October 2018
Computational Insights into Materials and Interfaces for Capacitive Energy Storage journal April 2017
Highly Loaded Mildly Edge‐Oxidized Graphene Nanosheet Dispersions for Large‐Scale Inkjet Printing of Electrochemical Sensors journal January 2020
Ionic liquid electrolytes in electric double layer capacitors journal July 2019
Charge storage at the nanoscale: understanding the trends from the molecular scale perspective journal January 2017
A first-principles roadmap and limits to design efficient supercapacitor electrode materials journal January 2019
Exploring doped or vacancy-modified graphene-based electrodes for applications in asymmetric supercapacitors journal January 2020
Synthesis of edge-rich vertical multilayer graphene nanotube arrays towards high-performance supercapacitors journal August 2019
Theoretical Study on the Quantum Capacitance Origin of Graphene Cathodes in Lithium Ion Capacitors journal October 2018

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