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

Etesami, Mohammad and Abouzari-Lotf, Ebrahim and Ripin, Adnan and Nasef, Mohamed Mahmoud and Ting, Teo M. and Saharkhiz, Azam and Ahmad, Arshad (2018) Phosphonated graphene oxide with high electrocatalytic performance for vanadium redox flow battery. International Journal of Hydrogen Energy, 43 (1). pp. 189-197. ISSN 0360-3199

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Official URL: http://dx.doi.org/10.1016/j.ijhydene.2017.11.050

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.

Item Type:Article
Uncontrolled Keywords:Carbon felt, Electrocatalyst
Subjects:T Technology > TP Chemical technology
Divisions:Chemical and Energy Engineering
ID Code:86375
Deposited By: Widya Wahid
Deposited On:31 Aug 2020 22:02
Last Modified:31 Aug 2020 22:02

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