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Published on: September 10, 2012
Self-assembled heteropolyacid on nitrogen-enriched carbon nanofiber for vanadium flow batteries
Mohammad Etesami1, Ebrahim Abouzari-Lotf, Saidatul Sophia Sha'rani
1Advanced Materials Research Group, Centre of Hydrogen Energy, Universiti Teknologi Malaysia, 54100, Kuala Lumpur, Malaysia. Ebrahim@utm.my.
Abstract:
A novel polyoxometalate-based electrode was developed by incorporating phosphotungstic acid (PWA) in nylon-6,6 nanofiber, followed by carbonization. The developed PWA-carbon nanofiber (PWA-CNF) showed the characteristics of the dual-scale porosity of micro- and mesoporous substrate with surface area of around 684 m2 g-1. The compound exhibited excellent stability in vanadium electrolyte and battery cycling. Evaluation of electrocatalytic properties toward V2+/V3+ and VO2+/VO2+ redox couples indicated promising advantages in electron transfer kinetics and increasing energy efficiency, particularly for the VO2+/VO2+ couple. Moreover, the developed electrode exhibited substantially improved energy efficiency (14% higher than that of pristine carbon felt) in the single cell vanadium redox flow battery. This outstanding performance was attributed to high surface area and abundant oxygen-containing linkages in the developed electrode.
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