A comparative study of chemically oxidized carbon cloth and thermally treated carbon paper electrodes applied on aqueous organic redox flow batteries

Author(s)

Faria, Luana C. I. ; Sedenho, Graziela C. ; Bertaglia, Thiago ; Macedo, Lucyano J. A. ; Crespilho, Frank N.

• Document type: Journal article
• Source: Electrochimica Acta; v. 485, p. 8-pg., 2024-03-16.

Abstract

Aqueous organic redox flow batteries (AORFBs) are emerging as promising candidates for efficient energy storage in grid-scale applications. In this study, we present a comprehensive analysis comparing the performance of thermally treated carbon paper and chemically oxidized carbon cloth electrodes, which have been extensively examined for their potential suitability in AORFBs. Results indicate that carbon cloth electrodes exhibit a higher concentration of oxygenated functional groups, contributing to enhanced electrochemical kinetics and improved electrochemical stability. These attributes translate to an AORFB with 62 times higher power density when compared to paper-based electrodes used. Through repeated charge-discharge cycles utilizing the BQDS & boxV;AQS model as a representative AORFB prototype, superior performance in the carbon cloth electrodes is consistently observed. Our findings even suggest the potential for optimizing the flow rate of the electrolyte to further enhance performance. (AU)

• FAPESP's process: 22/09164-5 - Understanding the charge transfer mechanisms in biological and biomimetic systems using in-situ and operando techniques: from fundamental science to energy application
• Grantee: Frank Nelson Crespilho
• Support Opportunities: Regular Research Grants
• FAPESP's process: 20/12404-2 - Multi-user equipment approved in grant 2018/22214-6, In situ STM with Electrochemistry
• Grantee: Frank Nelson Crespilho
• Support Opportunities: Multi-user Equipment Program
• FAPESP's process: 19/21089-6 - Carbon surfaces for organic battery application: structural properties of the hydrogel/electrolyte/electrode interface
• Grantee: Luana Cristina Italiano Faria
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• FAPESP's process: 20/04796-8 - In situ and operando studies of metaloenzymes for energy conversion and fuel bioelectrosynthesis
• Grantee: Graziela Cristina Sedenho
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 17/20493-2 - Study of metalloenzymes through electrochemistry coupled to vibrational spectroscopy
• Grantee: Lucyano Jefferson Alves de Macêdo
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 20/03681-2 - Organic microbatteries: using bioinspired hydrogels and redox molecules
• Grantee: Thiago Bertaglia
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• 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