A Little Nickel Goes a Long Way: Ni Incorporation into RhP for Stable Bifunctional Electrocatalytic Water Splitting in Acidic Media.

In acidic media, many transition-metal phosphides are reported to be stable catalysts for the hydrogen evolution reaction (HER) but typically exhibit poor stability toward the corresponding oxygen evolution reaction (OER). A notable exception appears to be RhP/C nanoparticles, reported to be active and stable toward both the HER and OER. Previously, we investigated base-metal-substituted RhP, specifically CoRhP and NiRhP, for HER and OER as a means to reduce the noble-metal content and tune the reactivity for these disparate reactions.