Abstract
AbstractExploring the mechanism of hydrogen oxidation reaction (HOR) in alkaline media is essential for the development of alkaline polymer electrolyte fuel cells (APEFCs). In this work, a series of Pd−Ni(OH)2 composites with different Pd/Ni atomic ratios (Pd : Ni=1:0 (without Ni addition), 7 : 1, 5 : 1, 3 : 1, 1 : 1) have been synthesized via wet chemical reduction method, and their corresponding HOR activities have been systematically evaluated with rotating disk electrode (RDE) technique. A good linear relationship between the HOR activities (described as the mass activity and exchange current density) and the surface oxophilicities (assessed by the oxidation current at 0.3 V vs. RHE in CO stripping voltammetry) is observed, indicating a bifunctional mechanism for HOR. The present study offers a direction for further improving the activity of Pd‐based HOR electrocatalyst.
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