Phosphide-oxide honeycomb-like heterostructure CoP@CoMoO4/CC for enhanced hydrogen evolution reaction in alkaline solution

•The unique honeycomb-like CoP@CoMoO4/CC was prepared due to the difference stability of mono-bimetallic.•CoP@CoMoO4/CC achieves an overpotential of 81 mV, a tafel slope of 69 mV dec−1, benefiting from the promotion of HER kinetics by CoP and CoMoO4.•The excellent synergistic effect of phosphorus-oxide significantly enhances the stability of CoP in alkaline solutions.