In situ growth of CdIn2S4 on NH2-MIL-125 as efficient photocatalysts for H2 production under visible-light irradiation

Abstract

Heterojunction engineering is considered an effective strategy to improve the photocatalytic hydrogen production efficiency. In this paper, the novel CdIn2S4@NH2-MIL-125 (CIS@TIM) heterojunction photocatalysts were synthesized by the facile hydrothermal method. And the photocatalytic performance and stability for CIS@TIM of CIS were systematically investigated. Among these catalysts, the optimal catalysts (CIS@ with different ratios TIM-30) exhibited the highest photocatalytic hydrogen rate (2550 μmol g−1 h−1) under visible light illumination, which was more than 3 times that of pure CIS. The enhancement of photocatalytic hydrogen production activity was mainly due to the construction of heterojunction between CdIn2S4 and NH2-MIL-125. The construction of heterojunction can effectively separate photogenerated electrons and holes. Significantly, a rational catalytic mechanism that Z-scheme heterojunction was constructed between CdIn2S4 and NH2-MIL-125 was put forward, which can remarkably boost the photo-redox ability of the CIS@TIM composite. This work provides a new horizon for exploring high-efficient Z-scheme photocatalysts for photocatalytic H2 evolution by the heterojunction engineering.