| Full text | |
| Author(s): |
Hassan, Ayaz
;
Mattioli, Isabela A. A.
;
Colombo, Rafael N. P.
;
Crespilho, Frank N. N.
Total Authors: 4
|
| Document type: | Journal article |
| Source: | JOURNAL OF MATERIALS CHEMISTRY C; v. 11, n. 19, p. 5-pg., 2023-04-17. |
| 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 mu F cm(-2) for the pristine graphene up to 11.11 mu F 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. (AU) | |
| FAPESP's process: | 19/12053-8 - High performance electrodes applied in organic batteries and in biofuel cell |
| Grantee: | Frank Nelson Crespilho |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 19/15333-1 - Bio-photo-electrochemical hybrid cells for solar energy conversion |
| Grantee: | Frank Nelson Crespilho |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 18/22214-6 - Towards a convergence of technologies: from sensing and biosensing to information visualization and machine learning for data analysis in clinical diagnosis |
| Grantee: | Osvaldo Novais de Oliveira Junior |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 21/05665-7 - Development of Van der Waals surfaces for application in biodevices |
| Grantee: | Rafael Neri Prystaj Colombo |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |