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Effect of electrode porosity on the charge transfer in vanadium redox flow battery

Lookup NU author(s): Aumber Abbas, Dr Anh Phan

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).


Abstract

© 2021 Elsevier B.V. Vanadium redox flow battery (VRB) has attracted enormous attention as a large-scale energy storage system owing to its long life, stable capacity and high safety. The electrode porosity plays a crucial role in the performance of VRB. This work reports the effect of electrode porosity on the electrocatalytic activity and charge transfer in VRB using spent tea derived porous carbon as electrode material. The electrode porous microstructure is systematically modified and specific surface area is enhanced from ~10 to ~2085 m2 g⁻1, with microporosity up to ~1930 m2 g⁻1. The electrochemical performance of modified electrodes is comprehensively investigated by cyclic voltammetry, impedance spectroscopy and galvanostatic charge/discharge studies. The modified electrode with high degree of porosity improves the charge transfer process and exhibits lower charge transfer resistance with higher electrocatalytic activity for vanadium redox reactions. Moreover, the VRB static cell performance demonstrates superior energy, voltage and coulombic efficiencies for modified electrodes than the pristine graphite electrode at all tested current densities. The results suggest that the tailored porosity substantially influences the charge migration and significantly improves the VRB performance.


Publication metadata

Author(s): Abbas A, Abbas S, Bhattarai A, Latiff NM, Wai N, Phan AN, Lim TM

Publication type: Article

Publication status: Published

Journal: Journal of Power Sources

Year: 2021

Volume: 488

Print publication date: 15/03/2021

Online publication date: 09/01/2021

Acceptance date: 26/12/2020

Date deposited: 24/03/2021

ISSN (print): 0378-7753

ISSN (electronic): 1873-2755

Publisher: Elsevier BV

URL: https://doi.org/10.1016/j.jpowsour.2020.229411

DOI: 10.1016/j.jpowsour.2020.229411


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