Synergism of 1D CdS/2D Modified Ti3C2Tx MXene Heterojunctions for Boosted Photocatalytic Hydrogen Production

Shi Cheng, Qianqian Xiong, Chengxiao Zhao* and Xiaofei Yang*

Chin. J. Struct. Chem. 2022, 41, 2208058-2208064  DOI: 10.14102/j.cnki.0254-5861.2022-0151

July 25, 2022

CdS, MXene, heterojunction, water splitting, hydrogen evolution reaction

ABSTRACT

Rational design and controllable synthesis of visible-light-responsive photocatalysts that exhibit both good hydrogen-producing efficiency and stability in the water splitting reaction are undoubtedly a challenge. Here we report an integrated CdS nanorod/oxygen-terminated Ti3C2Tx MXene nanosheet heterojunction with a high catalytic hydrogen evolution reaction (HER) activity. By incorporating one-dimensional (1D) CdS nanorods onto annealed ultrathin two-dimensional (2D) MXene nanoshees, the mixed-dimensional 1D/2D heterojunction achieved a hydrogen-evolving rate of 8.87 mmol × g-1 × h-1, much higher than that of bulk CdS and CdS/unmodified MXene hybrid catalysts. The enhanced HER activity and stability of the designed heterojunction catalyst are attributed to the presence of oxygen-containing terminal groups on the surface of thermally treated Ti3C2Tx MXene, extended light absorption spectra as well as the precisely-constructed intimate Schottky contact, implying an accelerated interfacial charge transfer and efficient, long-term photocatalytic hydrogen production performance. The results demonstrate that oxygen-terminated 2D MXene can be well utilized as a functional platform for the development of novel heterojunctioned photocatalysts.

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