Abstract
Nanostructured nickel tungsten carbide (Ni6W6C) and nickel molybdenum carbide (Ni6Mo6C) are well known hydrodesulfurization catalysts, that have been speculated to be useful as sulfur-tolerant proton exchange membrane fuel cell anode catalysts. We synthesized these compounds and evaluated their electrocatalytic activities for the hydrogen oxidation reaction (HOR) in sulfur-free electrolyte as well as electrolyte contaminated with 31 μM mercaptosuccinic acid (1 ppm sulfur) using a rotating disk electrode. The HOR activity of the carbides is higher than that reported elsewhere, but still is low when compared to platinum catalysts. The nanostructured catalysts corrode and show poor sulfur tolerance. Further development is needed to understand why these catalysts perform poorly in fuel cell environments.
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