Based on the concept of semiconductor heterojunction, for the first time, a series of calcium tantalate-based semiconductor heterojunction composites were synthesized by a simple process and low-cost molten salt method. It was found that the components and contents of binary and multi-element semiconductor composites can be simply controlled by changing the proportion of precursors. It proves that the changes in crystal phases and composition of the heterojunction composites are closely related to the photocatalytic hydrogen production performance, and clarifies the mechanism that the formation of heterojunctions at the interface of different calcium tantalate crystal phases promotes the effective separation of photogenerated charges. Greatly improve the photocatalytic hydrogen production performance.

Synthetic tunnel structure Sr2KNMO15 (M= Nb,Ta, W, Mo, etc.) nanorod photocatalytic materials. For the first time, tungsten bronze-type Sr2KNb5O15 and Sr2KTa5O15 nanorod tunnel structure photocatalytic materials were developed. Compared with the international standard TiO2, this unique structure shows excellent photocatalytic hydrogen production performance (increased by more than 6 times and 10 times respectively); It was also found that these tunnel structure photocatalytic materials have good total water decomposition ability and the Ni/NiO nanoparticle core-shell structure promoting effect. Based on their uniform nanorod morphology structure, strong evidence for the formation of surface-supported Ni/NiO nanoparticles core-shell structures were found, and a correct explanation was given for the possible mechanism of their catalytic total water decomposition.