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Title: Effect of electrode porosity on the charge transfer in vanadium redox flow battery
Authors: Abbas, Aumber
Abbas, Saleem
Bhattarai, Arjun
Naziah Mohamad Latiff
Wai, Nyunt
Phan, Anh N.
Lim, Tuti Mariana
Keywords: Engineering::Civil engineering
Issue Date: 2021
Source: Abbas, A., Abbas, S., Bhattarai, A., Naziah Mohamad Latiff, Wai, N., Phan, A. N., & Lim, T. M. (2021). Effect of electrode porosity on the charge transfer in vanadium redox flow battery. Journal of Power Sources, 488, 229411-. doi:10.1016/j.jpowsour.2020.229411
Journal: Journal of Power Sources 
Abstract: 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.
ISSN: 0378-7753
DOI: 10.1016/j.jpowsour.2020.229411
Rights: © 2021 Elsevier B.V. All rights reserved. This paper was published in Journal of Power Sources and is made available with permission of Elsevier B.V.
Fulltext Permission: embargo_20230116
Fulltext Availability: With Fulltext
Appears in Collections:CEE Journal Articles
ERI@N Journal Articles
NEWRI Journal Articles

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