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The hydroxide exchange membrane fuel cell (HEMFC) is a promising energy conversion technology, but it is limited by the need of platinum-group-metal (PGM) electrocatalysts, especially for the hydrogen oxidation reaction (HOR). Here we report a Ni-based HOR catalyst that exhibits an electrochemical surface area-normalized exchange current density of 70 μA/cm2, the highest among PGM-free catalysts. The catalyst comprises of Ni nanoparticles embedded in a nitrogen-doped carbon support. Accordingdoi:10.26434/chemrxiv.13546823.v1 fatcat:psed4rojovgf5aeefu7ignwizm