Construction of graphdiyne/CoMoO4 type II heterojunction for efficiently enhanced photocatalytic hydrogen evolution

Abstract

Cost-effective bimetallic oxide catalysts are gradually replacing noble metal catalysts for photocatalytic hydrogen production. This study used a two-step method to synthesize CoMoO4 with a rod-shaped structurea. CuBr is a catalytic base synthesis graphdiyne material. The graphdiyne that serves to anchor CoMoO4 rods through a solvent-thermal synthesis method, thereby enhancing the photocatalytic performance of the resultant composite catalyst. The results show that the 5 h hydrogen evolution capacity of the optimized CoMoO4/graphdiyne composite catalyst is 187.47 μmol, which is 2.9 times higher than that of CoMoO4 monomer and 41.7 times higher than that of graphdiyne monomer. The addition of graphdiyne provides a larger comparison area for CoMoO4, giving composite catalyst more active sites, and enhancing the optical hydrogenation effect of catalysts. Through the Mott-Schottky test, the UV–visible diffuse reflectance test and band gap calculation can be speculated that the CoMoO4 and graphdiyne construct the type II heterojunction which promotes the rapid transfer of photogonic carriers. This work provides a good prospect and opportunity for studying graphdiyne in the application of graphdiyne in the application of dualmetal oxides.