The CoN which with excellent performance was introduced into Mn_0.2Cd_0.8S through simple electrostatic self-assembly for the first time, then the composite photocatalyst with low cost and high catalytic activity was prepared. The introduction of CoN improves the absorption intensity of catalyst to visible light. CoN accepts photo-induced electrons from Mn_0.2Cd_0.8S as an excellent electron acceptor in the form of active sites due to its suitable conduction band position and good conductivity. The surface interaction of composite photocatalyst formed by electrostatic self-assembly is strong, which is conducive to the directional transfer of photogenic carriers from Mn_0.2Cd_0.8S to CoN, greatly inhibits the recombination of photogenic carriers and improves the separation and the transfer rate of photogenic carriers. The introduction of CoN greatly improved the hydrogen production rate of photocatalyst up to 14.612 mmol g⁻¹ h⁻¹, it was 17.3 times that of pure MCS. This work provides inspiration for transition metal nitrides as cocatalysts in the sphere of photocatalytic splitting of water for hydrogen production.

首次通过简单的静电自组装将性能优异的CoN引入Mn _0.2 Cd _0.8 S中，制备了低成本，高催化活性的复合光催化剂。CoN的引入提高了催化剂对可见光的吸收强度。由于其合适的导带位置和良好的导电性，CoN可以以活性位点的形式接受来自Mn _0.2 Cd _0.8 S的光诱导电子作为出色的电子受体。静电自组装形成的复合光催化剂的表面相互作用强，有利于光生载体从Mn _0.2 Cd _0.8的定向转移从S到CoN，极大地抑制了光生载体的重组，并改善了光生载体的分离和转移速率。CoN的引入大大提高了光催化剂的产氢率，达到14.612 mmol g ^-1 h ^-1，是纯MCS的17.3倍。这项工作为过渡金属氮化物作为光催化分解水中氢气的助催化剂提供了灵感。