Abstract
The development of zinc bromine redox flow battery technology is experiencing a critical challenge due to the slow kinetics of bromine/bromide redox reactions, which results in poor efficiency of the cell. Here, we demonstrate a comparative electrocatalytic effect of platinum, graphite and graphite/single-walled carbon nanotube (G/SWCNT) composite electrodes for the 2Br–/Br2 redox couple for zinc bromine redox flow battery application. The anodic peak current density of G/SWCNT electrode is found to be higher than that of pristine Pt and graphite electrodes, indicating the enhanced electrocatalytic effect of G/SWCNT perhaps due to the incorporated basal planes. The peak separation between the anodic and cathodic process of graphite and G/SWCNT electrodes is 225 and 160 mV, respectively, demonstrating the quasireversible nature of the 2Br–/Br2 redox reaction. Further characterizations of composites electrodes are carried out using FTIR, Raman spectroscopy and scanning electron microscopy (SEM) before and after cycling. The electrochemical performance and characteristic of the zinc bromine flow cell fabricated with graphite and G/SWCNT as electrodes is discussed in detail.
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