Construction of Ni 3 S 4 @ZIS@C 3 N 5 photocatalyst with type II and Z-type heterojunctions by self-assembly for efficient photocatalytic hydrogen evolution

A novel ternary photocatalyst Ni S @ZIS@C N with type II and Z-type heterojunctions was synthesized for the first time by hydrothermal and electrostatic self-assembly methods, effectively avoiding the thermal decomposition of C N during the synthesis of the complex. The best ternary catalyst Ni S @ZIS@C N is capable of achieving an optimal hydrogen evolution rate of 9750 mmol g h , which is approximately 10.89 times as high as that of C N , indicating that the complex effectively enhanced the photocatalytic properties of the monomer. The coexistence of two types of heterojunctions in the complex effectively enhances photocatalytic performance, in which the monomer ZIS constructs type II scheme with Ni S and Z-type scheme with C N , respectively. The two heterojunctions complement each other and jointly promote the rapid electron transfer from Ni S and C N to the ZIS surface. In conclusion, the cooperation of the two heterojunctions efficiently facilitates the migration of photogenerated carriers, thus enhancing the photocatalytic hydrogen generation performance of Ni S @ZIS@C N .