2D/2D耦合构建ZnIn2S4/TiO2异质结及其增强的光催化还原CO2性能

doi:10.15541/jim20250097

摘要/Abstract

摘要： 二氧化钛(TiO₂)作为一种典型的光催化材料,因其优异的化学稳定性、无毒性和低成本等优势,在环境治理和能源转换领域得到了广泛应用。然而,其较宽的带隙结构导致只能吸收紫外光,而且块体材料中光生电子-空穴对的严重复合制约了量子效率。本研究采用水热法构筑了一种新型2D/2D耦合的ZnIn₂S₄(ZIS)@TiO₂复合材料。该异质结构由超薄TiO₂纳米笼与片状ZIS纳米片复合而成,具有独特的中空核壳形貌。复合40 mg TiO₂纳米笼的ZIS-T20催化剂在400~720 nm宽波长范围内展现出显著增强的光吸收能力。在内建电场的作用下,光生电子无法从ZIS的导带(CB)向TiO₂的CB迁移,而空穴从ZIS的价带(VB)转移至TiO₂的VB却不受阻碍,这种空间分离效应使得ZIS中保留了具有较高还原电位的电子,克服了传统I型异质结还原电势降低的固有缺陷。在光催化CO₂还原(PCR)性能测试中,ZIS@TiO₂的催化性能得到显著提升,CO和CH₄的生成速率分别达到58.87和12.03 μmol·g^-1·h^-1,较纯ZIS和TiO₂分别提高了6.15和1.96倍,其中CO选择性高达83.03%。该工作不仅为设计高效2D/2D异质结光催化剂提供了新思路,也为深入理解界面电荷转移机制提供了重要参考。

关键词: 2D/2D耦合, TiO₂纳米片, 光催化CO₂还原, 异质结, ZnIn₂S₄

Abstract: As a typical photocatalytic material, titanium dioxide (TiO₂) has been widely applied in environmental remediation and energy conversion due to its excellent chemical stability, non-toxicity, and low cost. However, its wide bandgap structure restricts light absorption to ultraviolet wavelengths, and the severe recombination of photogenerated electron-hole pairs in bulk materials limits quantum efficiency. A hydrothermal method was used to construct a novel 2D/2D coupled ZnIn₂S₄ (ZIS)@TiO₂ composite material. This heterojunction consists of ultrathin TiO₂ nanocages composited with ZIS nanosheets, exhibiting a unique hollow core-shell morphology. ZIS-T20 catalyst with composite 40 mg TiO₂ nanocages demonstrates significantly enhanced light absorption across a broad wavelength range of 400-720 nm. Under the influence of the built-in electric field, photo-generated electrons cannot migrate from the conduction band (CB) of ZIS to that of TiO₂, whereas the transfer of holes from the valence band (VB) of ZIS to that of TiO₂ proceeds unimpeded. This spatial separation effect preserves electrons with high reduction potential in ZIS, overcoming the inherent drawback of reduced redox capability in conventional type-I heterojunctions. In photocatalytic CO₂ reduction (PCR) reaction, ZIS@TiO₂ exhibits improved performance, achieving CO and CH₄ production rates of 58.87 and 12.03 μmol·g^-1·h^-1, respectively, with CO selectivity as high as 83.03%. Compared to individual components, the CO yield was 6.15 and 1.96 times higher than that of pristine ZnIn₂S₄ and TiO₂, respectively. This work not only provides a new strategy for designing efficient 2D/2D heterojunction photocatalysts, but also offers valuable insights into understanding interfacial charge transfer mechanisms.

Key words: 2D/2D coupling, TiO₂ nanosheet, photocatalytic CO₂ reduction, heterojunction, ZnIn₂S₄

中图分类号:

TQ426

朱建华, 杨鑫, 茹凌杰. 2D/2D耦合构建ZnIn₂S₄/TiO₂异质结及其增强的光催化还原CO₂性能[J]. 无机材料学报, DOI: 10.15541/jim20250097.

ZHU Jianhua, YANG Xin, RU Lingjie. 2D/2D Coupled ZnIn₂S₄/TiO₂Heterojunction and Enhanced Photocatalytic Reduction of CO₂[J]. Journal of Inorganic Materials, DOI: 10.15541/jim20250097.

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2D/2D耦合构建ZnIn₂S₄/TiO₂异质结及其增强的光催化还原CO₂性能

2D/2D Coupled ZnIn₂S₄/TiO₂Heterojunction and Enhanced Photocatalytic Reduction of CO₂

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