Energy band matching WO3/B-doped g-C3N4 Z-scheme photocatalyst to fix nitrogen effectively

Abstract Photocatalytic nitrogen fixation is a promising method for solar energy storage. In order to improve the efficiency of photocatalysis, it is necessary to accelerate the transfer of photogenerated electron-holes and inhibit their recombination. Based on energy band engineering theory, the band gap of CN is changed by adjusting the doping proportion of B element so as to better match the energy band of WO3, and the optimal energy band state is achieved. The change of the band of CN is studied in depth while introducing B. The WO3/B-CN photocatalytic system can effectively improve the separation efficiency and prolong the life of photogenerated carriers. The quantum efficiency of the photocatalyst material for nitrogen fixation at 400 nm is 0.71%. The yield of NH3 under visible light is 450.94 μmol g-1 h-1. This study has important guiding significance for the design of high efficiency photocatalysts in photocatalytic nitrogen fixation.