Construction of p-n type heterojunction for effective photo-generated electron separation and visible light hydrogen evolution

With the development of research on the photocatalytic water splitting and hydrogen (H 2 ) precipitation, cobalt ferrite and molybdate have begun to appear as catalysts for the study of photocatalytic hydrogen precipitation. In this paper, the p-n heterojunction CoFe 2 O 4 /NiMoO 4 (CFO/NMO) is prepared by hydrothermal method . The constructed p-n type (type Ⅱ) heterojunction CFO/NMO has the highest hydrogen evolution (Eosin Y as a sensitizer), which is 7.39 times and 1.95 times that of elemental CFO and NMO, respectively. After the CFO and NMO form a heterojunction, a built-in electric field is formed inside to effectively separate the photogenerated carriers . At the same time, the dense interface of the heterojunction also promotes the transfer of photogenerated carriers and promotes the reduction of H + protons on this catalyst surface . In short, this work provides more possibilities for the field of photocatalytic hydrogen evolution from molybdate and cobalt ferrite compounds.