Abstract
A quaternary nanoflower photocatalyst, NiS/In(OH)3/InOOH/ZnIn2S4, with compact heterojunction, is synthesized through a two-step solvothermal method. NiS, In(OH)3 and InOOH are generated in situ on the surface of ZnIn2S4 nanosheets. Namely, the S of NiS, the In of In(OH)3 and InOOH are directly derived from ZnIn2S4. In addition, the relative amount of In(OH)3 and InOOH in the NiS/In(OH)3/InOOH/ZnIn2S4 composite can be controlled by adjusting the dosage of Ni2+ during the second solvothermal process. The average H2 evolution rate of NiS-ZIS-1 is 1911 μmol·g−1·h−1, approximately 5.1, 2.4, 3.5 times higher than that of ZIS, In(OH)3/InOOH/ZnIn2S4, and NiS/ZnIn2S4, respectively. Structural characterizations, photoelectric property tests, theoretical calculations, and in-situ XPS analyses reveal that the excellent visible light photocatalytic H2 production property of the NiS/In(OH)3/InOOH/ZnIn2S4 composite is due to the synergistic interaction of NiS, In(OH)3 and InOOH. Namely, the in-situ construction of NiS, In(OH)3 and InOOH on the ZnIn2S4 nanosheets can accelerate the electrons migration and improve the charge carriers’ separation efficiency. Meanwhile, the NiS, In(OH)3 and InOOH provide more active sites for the reduction of H+ reduction to H2.
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