Electrochemical investigation of thermically treated graphene oxides as electrode materials for vanadium redox flow battery

O. Di Blasi, N. Briguglio, C. Busacca, M. Ferraro, V. Antonucci and A. Di Blasi

Applied Energy, 2015, vol. 147, issue C, 74-81

Abstract: Thermically treated graphene oxides (TT-GOs) are synthesized at different temperatures, 100°C, 150°C, 200°C and 300°C in a reducing environment (20% H2/He) and investigated as electrode materials for vanadium redox flow battery (VRFB) applications. The treated graphene oxide-based electrodes are prepared by the wet impregnation method using carbon felt (CF) as support. The main aim is to achieve a suitable distribution of the dispersed graphene oxides on the CF surface in order to investigate the electrocatalytic activity for the VO2+/VO2+ and V2+/V3+ redox reactions in the perspective of a feasible large area electrodes scale-up for battery configuration of practical interest. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) are carried out in a three electrode half-cell to characterize the electrochemical properties of the TT-GO-based electrodes. Physico-chemical characterizations are carried out to corroborate the electrochemical results. The TT-GO sample treated at 100°C (TT-GO-100) shows the highest electrocatalytic activity in terms of peak to peak separation (ΔE=0.03V) and current density intensity (∼0.24Acm−2 at 30mV/s) both toward the VO2+/VO2+ and V2+/V3+ redox reactions. This result is correlated to the presence of hydroxyl (OH) and carboxyl (COOH) species that act as active sites. A valid candidate is individuated as effective anode and cathode electrode in the perspective of electrodes scale-up for battery configuration of practical interest.

Keywords: Vanadium redox flow battery; Thermically treated graphene oxides; Wet impregnation method; Electrochemical properties (search for similar items in EconPapers)
Date: 2015
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Citations: View citations in EconPapers (11)

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DOI: 10.1016/j.apenergy.2015.02.073

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