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Phosphonated graphene oxide with high electrocatalytic performance for vanadium redox flow battery

Etesami, M. and Abouzari-Lotf, E. and Ripin, A. and Mahmoud Nasef, M. and Ting, T.M. and Saharkhiz, A. and Ahmad, A. (2018) Phosphonated graphene oxide with high electrocatalytic performance for vanadium redox flow battery. International Journal of Hydrogen Energy, 43 (1). pp. 189-197.

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Abstract

Development of more efficient electrodes is essential to improve the competitiveness of vanadium redox flow battery (VRFB) systems. Covalent functionalization of carbon structure in graphene oxide with phosphonic acid groups was carried out to enhance the electrode wettability. The phosphonated graphene oxide (P-GO) was characterized and found displaying an improved electrocatalytic performance towards electrooxidation/electroreduction of vanadium ion pairs. The defect in P-GO structure increased the negative charge density on the surface leading to higher vanadium ions tendency for electrooxidation/electroreduction reactions. The battery performance was evaluated using electrodes made of carbon felt hosted GO and P-GO in a single cell VRFB and 180 charge-discharge cycles were recorded. The VRFB with P-GO displayed an improved performance and stable coulombic, voltage and energy efficiency compared to VRFB with GO. © 2017 Hydrogen Energy Publications LLC

Item Type:Article
Impact Factor:cited By 2
Uncontrolled Keywords:Defect density; Electric batteries; Electric discharges; Electrocatalysts; Electrodes; Electrooxidation; Energy efficiency; Felt; Graphene; Secondary batteries; Surface defects; Vanadium, Carbon felts; Charge-discharge cycle; Covalent functionalizations; Electrocatalytic performance; Graphene oxides; Phosphonic acid groups; Vanadium redox batteries; Vanadium redox flow batteries, Flow batteries
Academic Subject One:Academic Department - Chemical Engineering - Separation Process
Departments / MOR / COE:Research Institutes > Institute for Sustainable Building
ID Code:21860
Deposited By: Ahmad Suhairi
Deposited On:01 Aug 2018 01:19
Last Modified:20 Feb 2019 06:26

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