Abstract
Alkaline anion exchange membrane (AEM) water electrolyzers paid significant attention due to the cost benefits over proton exchange membrane electrolyzers. The durability of AEM electrolyzers is one of the critical requirements for the commercially viable systems. We have investigated that the possible performance loss over time is related to the oxidation of polymeric binders used for AEM electrolyzers. In this presentation, the oxidative degradation of the phenyl group is reported using the commercial Pt/C, IrO2 and house-made perovskite oxide catalyst. Rotating disk electrode experiments exhibited that the oxidation of phenyl group on the oxygen evolution reaction (OER) catalysts is pronounced: The oxidation rate of commercial Pt/C and IrO2 catalysts was > 11% at 1.6 V vs. RHE over the 5-hour chronoamperometric test, while the house-made LA0.85Sr0.15CoO3 catalyst perovskite oxide catalyst exhibited 4.1%. Density functional theory calculations show that the adsorption of the phenyl on the perovskite oxide catalyst is significantly smaller, suggesting that the electrolyte oxidation is related to the adsorption properties of the phenyl group.
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