构建Bi4Ti3O12与g-C3N4偶联的无机/有机s型异质结用于光催化纯水制H2O2

IF 10.8 2区化学 Q1 CHEMISTRY, PHYSICAL

物理化学学报 Pub Date : 2024-11-01 DOI:10.3866/PKU.WHXB202403009

Ke Li , Chuang Liu , Jingping Li , Guohong Wang , Kai Wang

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引用次数: 0

摘要

过氧化氢（H2O2）作为工业化学和势能载体发挥着重要作用。然而，常见的H2O2光合作用催化剂存在太阳光谱吸收受限、团聚严重、再利用困难等问题，阻碍了其广泛应用。本研究采用静电纺丝辅助自组装的方法合成了一种由g-C3N4纳米片和Bi4Ti3O12纳米纤维组成的无机/有机异质结光催化剂。Bi4Ti3O12/g- c3n4异质结能显著提高H2O2产率（1650 μmol∙g−1∙h−1），并能直接从纯水中进行有效的H2O2光合作用。性能的提高是由于S-scheme异质结中光诱导载流子的可见光吸收、电荷分离效率和氧化还原性能的增强。此外，利用原位x射线光电子能谱（ISXPS）可以研究无机/有机Bi4Ti3O12/g-C3N4异质结的S-scheme机制和动力学。本研究提出了一种设计用于太阳能驱动H2O2生产的无机/有机异质结光催化剂的新方法。下载：下载高清图片（98KB）下载：下载全尺寸图片

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Architecting Inorganic/Organic S-Scheme Heterojunction of Bi4Ti3O12 Coupling with g-C3N4 for Photocatalytic H2O2 Production from Pure Water

Hydrogen peroxide (H₂O₂) plays a significant role as an industrial chemical and potential energy carrier. However, common H₂O₂ photosynthesis catalysts face challenges such as limited solar spectrum absorption, severe agglomeration, and difficulty in reuse, hindering their widespread application. In this study, an inorganic/organic heterojunction photocatalyst comprising g-C₃N₄ nanosheets and Bi₄Ti₃O₁₂ nanofibers is synthesized using electrospinning assisted self-assembly methods. The Bi₄Ti₃O₁₂/g-C₃N₄ heterojunction exhibits significantly enhanced H₂O₂ yield of 1650 μmol∙g⁻¹∙h⁻¹ and efficient H₂O₂ photosynthesis directly from pure water. The improved performance is attributed to enhanced visible light absorption, charge separation efficiency, and boosting redox properties of photoinduced carriers in S-scheme heterojunctions. Additionally, the utilization of in situ X-ray photoelectron spectroscopy (ISXPS) enables the investigation of the S-scheme mechanism and dynamics of inorganic/organic Bi₄Ti₃O₁₂/g-C₃N₄ heterojunctions. This research presents a novel approach for designing inorganic/organic heterojunction photocatalysts for solar-driven H₂O₂ production.

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