Nanoarchitectonics of CoMoO4/NiS catalyst with starry flower morphology for carrier transport path investigation with advanced and photocatalytic hydrogen evolution performance.

A novel p-n heterojunction photocatalyst of CoMoO 4 /NiS-3 was constructed by electrostatic adsorption (In CoMoO 4 /NiS-3, the content of CoMoO 4 accounts for 30%). Through SEM and crystal structure, it can be seen that the composite catalyst has a starry flower morphology and is successfully synthesized. The fluorescence emission spectra show that CoMoO 4 /NiS-3 can accelerate the separation rate of photogenerated carriers. The electron transfer mechanism can be determined by ultraviolet characterization and electrochemical methods. Hydrogen evolution experiments can be observed that the amount of hydrogen evolution by the composite catalyst CoMoO 4 /NiS-3 is 225.1 μmol, which is 2.74 and 4.89 times higher than that of the CoMoO 4 and NiS catalysts, respectively. Through the control of the starry flower morphology and the contact interface of p-n heterojunction, the internal electric field is effectively constructed to inhibit the recombination rate of photogenerated carriers, which provides a powerful theoretical model for high performance hydrogen evolution reaction. The formation of p-n heterojunction effectively improves the transmission path of photogenerated carriers and greatly improves the performance of photocatalytic hydrogen evolution. [Display omitted] • The p-n heterojunction between NiS and CoMoO 4 has good stability. • Dispersion of NiS on CoMoO 4 is important for the hydrogen evolution reaction activity. • The electron transport path and hydrogen evolution mechanism of CoMoO 4 /NiS composite catalyst are proposed. • High-efficiency hydrogen evolution is realized through CoMoO 4 /NiS heterojunction. [ABSTRACT FROM AUTHOR]