Tightly-bound interfaces between ZnIn2S4 nanosheets and few-layered Mo2TiC2 MXene induced highly efficient noble-metal-free Schottky junction for photocatalytic hydrogen evolution,Separation and Purification Technology

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Tightly-bound interfaces between ZnIn2S4 nanosheets and few-layered Mo2TiC2 MXene induced highly efficient noble-metal-free Schottky junction for photocatalytic hydrogen evolution
Separation and Purification Technology ( IF 8.1 ) Pub Date : 2024-12-19 , DOI: 10.1016/j.seppur.2024.131199
Huihui Zhang, Yamei Huang, Xinglin Wang, Jiayi Meng, Linlin Gao, Yu Li, Yu Zhang, Yifan Liao, Wei-Lin Dai

As a novel two-dimensional (2D) material with superior electrical conductivity, Mo₂TiC₂ MXene has been synthesized and applied in the fields of supercapacitors, lithium batteries, and electrocatalysis. Moreover, Mo₂TiC₂ MXene exhibits significant potential in photocatalytic processes due to its excellent light absorption and electron acceptance properties. Consequently, a few-layered Mo₂TiC₂ MXene with a large lamellar structure was designed and synthesized using etching and intercalation methods. Based on this, a tightly-bound ZnIn₂S₄/Mo₂TiC₂ binary composite was then fabricated through an in situ solvothermal process. Under simulated sunlight irradiation, the optimal ZnIn₂S₄/10 %Mo₂TiC₂ composite exhibited an outstanding photocatalytic hydrogen evolution (PHE) rate of 4.3 mmol·g⁻¹·h⁻¹ (using 10 mg of catalyst), which was 3.8 times higher than that of ZnIn₂S₄ and also surpassed the activity of ZnIn₂S₄ with 1 % Pt as co-catalyst. According to in situ X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT) calculations, the enhanced PHE activity was attributed to the formation of a Schottky junction with the tightly-bound interface between ZnIn₂S₄ and Mo₂TiC₂, which effectively facilitated the transfer of photogenerated electrons and inhibited electron recombination in the composites. Additionally, all the composites showed improved light absorption intensity compared to pure ZnIn₂S₄, which also contributed to the enhanced PHE performance. This work demonstrated the superior activity of few-layered Mo₂TiC₂ MXene as a noble-metal-free co-catalyst, and its large lamellar structure made it an ideal substrate for further incorporating with other semiconductors to construct high-performance MXene-based heterostructures.

更新日期：2024-12-20

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