Construction of Ni₃S₄@ZIS@C₃N₅ photocatalyst with type II and Z-type heterojunctions by self-assembly for efficient...

A novel ternary photocatalyst Ni₃S₄@ZIS@C₃N₅ 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 C₃N₅ during the synthesis of the complex. The best ternary catalyst Ni₃S₄@ZIS@C₃N₅ is capable of achieving an optimal hydrogen evolution rate of 9750 mmol g^-1 h^-1, which is approximately 10.89 times as high as that of C₃N₅, 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 Ni₃S₄ and Z-type scheme with C₃N₅, respectively. The two heterojunctions complement each other and jointly promote the rapid electron transfer from Ni₃S₄ and C₃N₅ 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 Ni₃S₄@ZIS@C₃N₅.