Citation: Tong Zhou, Xue Liu, Liang Zhao, Mingtao Qiao, Wanying Lei. Efficient Photocatalytic H₂O₂ Production and Cr(Ⅵ) Reduction over a Hierarchical Ti₃C₂/In₄SnS₈ Schottky Junction[J]. Acta Physico-Chimica Sinica, ;2024, 40(10): 230902. doi: 10.3866/PKU.WHXB202309020 shu

Efficient Photocatalytic H₂O₂ Production and Cr(Ⅵ) Reduction over a Hierarchical Ti₃C₂/In₄SnS₈ Schottky Junction

Tong Zhou ^{1, †} ,
Xue Liu ^{2, †} ,
Liang Zhao ¹ ,
Mingtao Qiao ¹ ,
Wanying Lei ^1,,

1.
College of Materials and Science, Xi'an University of Architecture and Technology, Xi'an 710055, China
2.
Institute of Tobacco Research, Chinese Academy of Agricultural Sciences, Qingdao 266101, Shandong Province, China

Corresponding author: Wanying Lei, leiwy@xauat.edu.cn

^†

Received Date: 12 September 2023
Revised Date: 18 October 2023
Accepted Date: 19 October 2023
Available Online: 20 December 2023
Fund Project: the National Natural Science Foundation of China 51902243the National Natural Science Foundation of China 2302112Key Research Project of Shaanxi Education Department 22JY039Key Research Project of Shaanxi Education Department 22JY037the Fundamental Research Funds for Central Non-Profit Scientific Institution 1610232023008the Agricultural Science and Technology Innovation Program ASTIP-TRIC07

Artificial photosynthesis is an appealing approach for generating hydrogen peroxide (H₂O₂) from H₂O and O₂ with solar energy as the sole energy input. However, the current catalyst systems commonly face challenges such as the limited optical absorption, poor electron-hole pair separation efficiency, and restricted surface reactivity, which hinders the overall photoactivity. Here, we immobilize cubic-phase ultrathin In₄SnS₈ nanosheets (E_g = 2.16 eV) with thickness of 5–10 nm on the surface of few-layer Ti₃C₂ to develop a sandwich-like hierarchical structure of Ti₃C₂/In₄SnS₈ nanohybrid via in situ hydrothermal strategy. The enlarged interfacial area and close contact between Ti₃C₂ and In₄SnS₈ benefit for carrier transportation among nanohybrids. Characterization through X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) corroborates the successful construction of Ti₃C₂/In₄SnS₈ nanostructures. Band structures investigation including valence band maximum and Mott-Schottky plots reveals the formation of Schottky junction in this 2D/2D heterostructure, that favors for ultrafast charge carrier separation and transportation from In₄SnS₈ to Ti₃C₂ and preventing the electrons backflow from Ti₃C₂ to In₄SnS₈. Photoluminescene analysis and photo/electrochemical measurements prove that the combination of Ti₃C₂ and In₄SnS₈ accelerates the transportation of photoexcited electron-hole pairs and efficiently suppresses charge carrier recombination. Unsurprisingly, 7 wt% Ti₃C₂/In₄SnS₈ catalysts exhibit the highest visible-light-driven photoreactivity with H₂O₂ production rates of 1.998 µmol∙L⁻¹∙min^‒1 that is 2.2 times larger than that of single In₄SnS₈. Additionally, Ti₃C₂/In₄SnS₈ demonstrates a multifunctional capability in Cr(Ⅵ) reduction with the greatest reaction rates of 19.8 × 10⁻³ min^‒1 that is almost 4-fold larger than that of individual semiconductor. Moreover, the nanohybrids exhibit excellent photostability after 5 cycles testing in both reaction systems. The morphology, crystal structure and composition for Ti₃C₂/In₄SnS₈ remain unaltered after photoreaction. A comprehensive analysis including trapping agents and atmosphere experiments as well as electron paramagnetic resonance demonstrates that the H₂O₂ evolution pathway consists of two channels: a two-step successive 1e^‒ oxygen reduction reaction and a one-step 2e^‒ water oxidation reaction. This work may provide a viable protocol for designing efficient and multifunctional photocatalytic systems for solar-to-chemical energy conversion.
- Ti₃C₂,
- In₄SnS₈,
- Photocatalysis,
- H₂O₂ production,
- Cr(Ⅵ) reduction
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Efficient Photocatalytic H2O2 Production and Cr(Ⅵ) Reduction over a Hierarchical Ti3C2/In4SnS8 Schottky Junction

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通讯作者: 陈斌, bchen63@163.com

Efficient Photocatalytic H₂O₂ Production and Cr(Ⅵ) Reduction over a Hierarchical Ti₃C₂/In₄SnS₈ Schottky Junction