Rhodium Phosphide: A New Type of Hydrogen Oxidation Reaction Catalyst with Non‐Linear Correlated Catalytic Response to pH

Abstract Rh 2 P nanoparticles were colloidally synthesized and used as electrocatalysts toward the hydrogen oxidation reaction (HOR) in alkaline electrolyte for the first time. It was found that Rh 2 P exhibits remarkable catalytic performance, which is superior to Rh and even commercial Pt/C and can be attributed to the synergistic effect caused by the P atoms on the surface of Rh 2 P. This work might open up a new avenue for expanding the family of electrocatalysts with advanced HOR performance in alkaline electrolyte.