物理化学学报 >> 2025, Vol. 41 >> Issue (6): 100064.doi: 10.1016/j.actphy.2025.100064

所属专题: 光催化中的S型异质结

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S型ZnO/CdIn2S4光催化剂制备H2O2偶联苄胺氧化的超快电子转移飞秒吸收光谱研究

杨祎1,2, 周欣3, 谷苗莉2, 程蓓2, 吴珍3,*(), 张建军4,*()   

  1. 1 湖北工业大学, 材料与化学工程学院, 湖北 武汉 430068
    2 武汉理工大学, 材料复合新技术国家重点实验室, 湖北 武汉 430070
    3 鄂尔多斯应用技术学院, 化学工程系, 内蒙古 鄂尔多斯 017000
    4 中国地质大学(武汉), 材料与化学学院太阳燃料实验室, 湖北 武汉 430078
  • 收稿日期:2025-01-22 修回日期:2025-02-12 录用日期:2025-02-13 发布日期:2025-04-19
  • 通讯作者: Email: wuzhen@oit.edu.cn (吴珍)zhangjianjun@cug.edu.cn (张建军)
  • 基金资助:
    国家自然科学基金(22278324); 国家自然科学基金(52202375); 国家自然科学基金(22469001); 湖北省自然科学基金(2022CFA001)

Femtosecond transient absorption spectroscopy investigation on ultrafast electron transfer in S-scheme ZnO/CdIn2S4 photocatalyst for H2O2 production and benzylamine oxidation

Yi Yang1,2, Xin Zhou3, Miaoli Gu2, Bei Cheng2, Zhen Wu3,*(), Jianjun Zhang4,*()   

  1. 1 School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, Hubei Province, China
    2 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, Hubei Province, China
    3 Department of Chemical Engineering, Ordos Institute of Technology, Ordos 017000, Inner Mongolia Autonomous Region, China
    4 Laboratory of Solar Fuel, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430078, Hubei Province, China
  • Received:2025-01-22 Revised:2025-02-12 Accepted:2025-02-13 Published:2025-04-19
  • Contact: Email: wuzhen@oit.edu.cn (Zhen Wu)zhangjianjun@cug.edu.cn (Jianjun Zhang)
  • Supported by:
    National Natural Science Foundation of China(22278324); National Natural Science Foundation of China(52202375); National Natural Science Foundation of China(22469001); the Science Foundation of Hubei Province of China(2022CFA001)

摘要:

光催化合成过氧化氢(H2O2)是一种至关重要的清洁能源转化过程,涉及对氧气的两电子还原。然而,这一过程常常受限于缓慢的水氧化反应,后者需要光生空穴的参与。为了应对此挑战,我们设计了一种双功能的S型ZnO/CdIn2S4异质结体系,将H2O2生成与增值的苄胺(BA)氧化反应进行耦合。在此双功能光催化系统中,CdIn2S₄中的光生电子可以高效地还原O2生成H2O2,而ZnO中的光生空穴则选择性地将BA氧化为N-亚苄基苄胺。得益于S型异质结的优势,相比于纯ZnO或CdIn2S4,优化后的ZnO/CdIn2S4光催化剂展示出显著更高的H2O2生成速率(386 μmol·L−1·h−1)和BA转化率(81%)。飞秒瞬态吸收光谱(fs-TA)结果说明,ZnO/CdIn2S4复合材料在光的激发下,在ZnO导带(CB)和CdIn2S4价带(VB)之间发生超快S型电子转移。此外,ZnO的VB空穴和CdIn2S4的CB电子的及时消耗,有助于加速ZnO/CdIn2S4 S型异质结界面中的电荷转移。本文中ZnO/CdIn2S4 S型光催化体系的创新设计为高效的双功能异质结光催化系统的开发提供了新的思路,并引入了一种利用fs-TA光谱研究S型异质结的新方法。

关键词: 光催化产H2O2, S型异质结, 选择性苄胺氧化, fs-TA光谱, 电子转移动力学

Abstract:

Photocatalytic hydrogen peroxide (H2O2) production is a crucial process for clean energy conversion, involving the reduction of O2 through two electrons. However, this process is often hampered by the sluggish water oxidation involving the photogenerated holes. To address this challenge, we have constructed a dual-functional S-scheme ZnO/CdIn2S4 heterojunction systerm coupling the H2O2 generation with a value-added benzylamine (BA) oxidation reaction. In this dual-functional photocatalytic system, photogenerated electrons in CdIn2S4 efficiently reduce O2 to produce H2O2, while photogenerated holes in ZnO selectively oxidize BA to N-benzylidenebenzylamine. Leveraging the advantages of the S-scheme heterojunction, the optimized ZnO/CdIn2S4 photocatalyst displays an enhanced H2O2 production rate (386 μmol·L−1·h−1) and BA oxidation fraction (81%) than pure ZnO or CdIn2S4. Femtosecond transient absorption (fs-TA) spectroscopy confirm the ultrafast S-scheme electron transfer from the ZnO conduction band (CB) to the CdIn2S4 valence band (VB) upon photoexcitation of the ZnO/CdIn2S4 composite. Besides, timely depletion of VB holes in ZnO and CB electrons in CdIn2S4 can accelerate the interfacial electron transfer in the ZnO/CdIn2S4 S-scheme heterojunction. The innovative design of the ZnO/CdIn2S4 S-scheme photocatalyst provides new insights for developing efficient dual-functional heterojunction photocatalytic systems and introduces a novel method for studying S-scheme heterojunctions using fs-TA spectroscopy.

Key words: Photocatalytic H2O2 production, S-scheme heterojunction, Selective benzylamine oxidation, fs-TA spectroscopy, Electron transfer dynamics