An efficient heterostructure MoP2-CoMoP-NC electrocatalyst derived from ZIF-67 for hydrogen evolution reaction

Abstract

The fabrication of heterostructure electrocatalysts is an effective method for optimizing catalytic activity and improving electrocatalytic performance. Herein, we designed a novel MoP2-CoMoP-NC heterostructure electrocatalyst derived from ZIF-67. The prepared MoP2-CoMoP-NC displays wheat-spike nanorods cross-linked with each other for providing a large electrochemically active surface area. Furthermore, the nitrogen-doped carbon framework derived from ZIF-67 successfully wrapped nanoparticles, which is advantageous for enhancing the stability and conductivity of the catalyst. The heterointerface between MoP2 and CoMoP facilitates mass transport and charge transfer. The MoP2-CoMoP-NC/NF heterostructure electrocatalyst shows enhanced electrocatalytic activity, with a relatively low overpotential of 88.2 mV at 10 mA cm−2 for the hydrogen evolution in alkaline conditions and a Tafel slope of only 65.9 mV dec−1. Furthermore, long-term measurements showed that MoP2-CoMoP-NC/NF has superior durability in alkaline solutions.