A Dynamic Active Site for OER Catalysis at Nickel-Vanadium-Phosphide Depends on V Surface Position and Fe in Alkaline.

Enhancing the rate of the oxygen evolution reaction (OER) by doping Ni-based electrocatalysts with guest metals other than Fe (V in this work) and the stability of the metal site should be assessed independent of Fe traces and in relation to the guest metal activity in solution. We examined OER catalysis and its sustainability at vanadium-doped nickel phosphide (NiP-V) independent of the role of Fe traces in alkaline. V was included in NiP by codeposition at cathodic bias (termed V) or postdeposition during the phosphide-to-hydroxide surface transformation at anodic bias in alkaline spiked with VCl (termed V).