Ti3C2 MXene纳米片上原位生长的Cd0.5Zn0.5S纳米棒实现高效可见光催化析氢

doi:10.3866/PKU.WHXB202402016

Abstract

Abstract:

Against the backdrop of energy scarcities and ecological concerns, the process of photocatalytic hydrogen evolution emerges as a critical method for transforming solar energy into chemical energy. Central to this technology is the crafting of photocatalysts that are not only efficient and durable but also economically viable. The key to creating photocatalysts that boast superior hydrogen production capabilities lies in enhancing the separation and transfer of photo-generated electrons and holes. This study introduces a binary heterojunction photocatalyst, featuring a combination of Cd_0.5Zn_0.5S and Ti₃C₂ MXene, synthesized via an in situ hydrothermal method. In the composite, slender Cd_0.5Zn_0.5S nanorods are uniformly coated over the surface of single layer Ti₃C₂ nanosheets, forming a Schottky heterojunction at the material interface. This structure enhances the separation efficiency of photo-generated electrons and holes, thereby improving the utilization of light. With 0.5 wt% (mass fraction) of Ti₃C₂ MXene incorporated, we observed a peak photocatalytic H₂ generation rate of 15.56 mmol∙g⁻¹∙h⁻¹, outperforming the baseline Cd_0.5Zn_0.5S by 2.56 times. Notably, the photocatalytic efficiency remained largely unchanged after five cycles. This composite achieved the highest apparent quantum efficiency (AQE) of 18.4% when exposed to 350 nm UV light. Various characterization techniques, including in situ X-ray photoelectron spectroscopy (XPS) and femtosecond transient absorption (fs-TA) spectroscopy, along with density functional theory (DFT) calculations, have further substantiated that the formation of a Schottky heterojunction at the interface is crucial for enhancing the photocatalytic hydrogen evolution performance of the composite material. This paper demonstrates the effectiveness of the novel carbon based material MXene as a co-catalyst for improving the performance of photocatalysts and offers a viable approach for the construction of MXene-containing photocatalytic hydrogen evolution catalysts.

Key words: Cd_1-xZn_xS nanorods, Photocatalysis, Hydrogen evolution, Ti₃C₂ MXene nanosheet, Heterojunction

Qin Li, Huihui Zhang, Huajun Gu, Yuanyuan Cui, Ruihua Gao, Wei-Lin Dai. In situ Growth of Cd_0.5Zn_0.5S Nanorods on Ti₃C₂ MXene Nanosheet for Efficient Visible-Light-Driven Photocatalytic Hydrogen Evolution[J]. Acta Phys. -Chim. Sin. 2025, 41(4), 100031. doi: 10.3866/PKU.WHXB202402016

Figures/Tables 11

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References 59

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In situ Growth of Cd_0.5Zn_0.5S Nanorods on Ti₃C₂ MXene Nanosheet for Efficient Visible-Light-Driven Photocatalytic Hydrogen Evolution

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In situ Growth of Cd0.5Zn0.5S Nanorods on Ti3C2 MXene Nanosheet for Efficient Visible-Light-Driven Photocatalytic Hydrogen Evolution

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In situ Growth of Cd_0.5Zn_0.5S Nanorods on Ti₃C₂ MXene Nanosheet for Efficient Visible-Light-Driven Photocatalytic Hydrogen Evolution