Work

Graphite felt etching Co 3 O 4 as a cathode to improve electrochemical characteristics for vanadium redox flow batteries

Year: 2026

Type: article

Abstract: In this study, a simple method involving immersion and heat treatment was used to modify graphite felt, enabling the attachment of Co 3 O 4 and altering its morphology. The etching process created nanorod structures, which significantly increased the surface area and improved wettability. A Co(NO 3 ) 2 concentration of 4 m m demonstrated optimal electrochemical activity compared to pristine graphite felt. Following the modification, the electrochemically active surface area reached a high value of 131.71 cm 2 , the charge transfer resistance decreased to 12.27 Ω, and the exchange current density increased to 25.02 mA/cm 2 . Cyclic voltammetry measurements revealed that GF4 exhibited reversible redox activity across various scan rates and maintained stability over 50 cycles at a scan rate of 1.0 mV/s, with I pa / I pc = 1.18 and ∆ E p = 220 mV. These findings indicate that the modification method improves the performance of graphite felt cathodes in vanadium redox flow batteries, emphasizing its potential for energy storage.

Source: Vietnam Journal of Chemistry

DOI: 10.1002/vjch.70132

Authors: Tran Bich Tram Vo, Phuong Nam Ta, Thuy Kim Thoa Ho, Van Man Tran

Institutions: Vietnam National University Ho Chi Minh City, Ho Chi Minh City University of Science

Language: English

Topic: Advanced battery technologies research

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: gold

Estimated APC paid: $3,400