The p-n heterojunction constructed by NiMnO3 nanoparticles and Ni3S4 to promote charge separation and efficient catalytic hydrogen evolution

Using sunlight to catalyze water to produce H 2 is a key technology to solve the problem of energy shortage. In this research, perovskite-type NiMnO 3 and Ni 3 S 4 was recombined through secondary hydrothermal treatment . The optimal hydrogen evolution for composite materials NiMnO 3 /Ni 3 S 4 is 3.76 μmol mg −1  h −1 , that 3.7 and 4 times more than that of two monomer materials, respectively. After four cycles of catalytic experiments, proving the high efficiency and stability of the composite catalyst. The characteristics of fluorescence spectroscopy and electrochemistry have confirmed the existence of p-n heterostructures , the excellent catalytic performance is related to the built-in electric field (accelerating the separation and utilization of photocharges) generated by the combination of NiMnO 3 and Ni 3 S 4 . Strengthening the performance of the catalyst by constructing a heterostructure is an effective modification strategy and has positive application value in the fields of sensors and optoelectronics .