Issue 19, 2023

Tuning quantum capacitance in 2D graphene electrodes: the role of defects and charge carrier concentration

Abstract

Even though graphene has been intensively applied in electrochemical devices, the effects of oxidation and how the presence of graphene structural defects interferes with the monolayer graphene electrode–aqueous electrolyte interface remains unclear. Here, we investigate the role of structural defects in the quantum capacitance at the interface between a graphene monolayer and the aqueous electrolyte solution, where the graphene was gradually oxidized by a temporal-controlled electrochemical procedure. We show that the quantum capacitance of graphene can be modulated by tuning the electronic properties, which resulted in a three-fold increase from a value of 3.83 μF cm−2 for the pristine graphene up to 11.11 μF cm−2 for the structurally modified monolayers. A strong correlation is observed between the carrier concentration, density of defects, and quantum capacitance. We suggest that the control of such properties can modulate the performance of graphene-based electrochemical devices according to application.

Graphical abstract: Tuning quantum capacitance in 2D graphene electrodes: the role of defects and charge carrier concentration

  • This article is part of the themed collection: #MyFirstJMCC

Supplementary files

Article information

Article type
Communication
Submitted
23 Ira. 2022
Accepted
14 Api. 2023
First published
17 Api. 2023

J. Mater. Chem. C, 2023,11, 6301-6305

Tuning quantum capacitance in 2D graphene electrodes: the role of defects and charge carrier concentration

A. Hassan, I. A. Mattioli, R. N. P. Colombo and F. N. Crespilho, J. Mater. Chem. C, 2023, 11, 6301 DOI: 10.1039/D2TC04037A

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