物理化学学报 >> 2025, Vol. 41 >> Issue (6): 100067.doi: 10.1016/j.actphy.2025.100067

所属专题: 光催化中的S型异质结

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设计热力学稳定的贵金属单原子光催化剂用于乙醇的高效非氧化转化形成高纯氢和增值产物乙醛

周昱晨1,2, 刘焕敏1, 李红星2,*(), 宋欣妤1, 唐永华2, 周鹏1,*()   

  1. 1 北京大学深圳研究生院, 环境与能源学院, 生态环境与资源效率研究实验室, 广东 深圳 518055
    2 湘潭大学, 物理与光电工程学院, 湖南 湘潭 411105
  • 收稿日期:2025-01-18 修回日期:2025-02-16 录用日期:2025-02-17 发布日期:2025-04-19
  • 通讯作者: Email: pengzhou1209@pku.edu.cn (周鹏)hongxinglee@xtu.edu.cn (李红星)
  • 基金资助:
    北京大学深圳研究生院启动基金和国家自然科学基金优秀青年科学家项目资助, 同时感谢曙光超级计算机中心对本文计算的支持

Designing thermodynamically stable noble metal single-atom photocatalysts for highly efficient non-oxidative conversion of ethanol into high-purity hydrogen and value-added acetaldehyde

Yuchen Zhou1,2, Huanmin Liu1, Hongxing Li2,*(), Xinyu Song1, Yonghua Tang2, Peng Zhou1,*()   

  1. 1 Eco-environment and Resource Efficiency Research Laboratory, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, Guangdong Province, China
    2 School of Physics and Optoelectronics, Xiangtan University, Xiangtan 411105, Hunan Province, China
  • Received:2025-01-18 Revised:2025-02-16 Accepted:2025-02-17 Published:2025-04-19
  • Contact: Email: pengzhou1209@pku.edu.cn (Peng Zhou)hongxinglee@xtu.edu.cn (Hongxing Li)
  • Supported by:
    The project was supported by the start-up support from Peking University Shenzhen Graduate School and the National Natural Science Foundation Excellent Young Scientist Project, PKUSZ, China. The authors would like to thank the calculation support from Shuguang Supercomputer Center

摘要:

光催化剂固有的表面原子构型,通常缺乏不稳定或难以生成的原子空位,这往往限制了金属单原子(MSA)助催化剂与光催化剂之间有效相互作用的形成,从而抑制了单原子光催化剂的稳定性和性能提升。在本研究中,我们提出了一种简便且经济的光化学氧还原反应(ORR)机制,用于在温和条件下(仅消耗水和氧气,压力为101325 Pa,温度为25 ℃)在TiO2光催化剂上制备热力学稳定的贵金属单原子助催化剂。第一性原理模拟首次从理论上揭示了TiO2的固有表面构型仅能产生不稳定的Pt―O2结构。然而,TiO2上发生的ORR不仅能够提供一个外来氧与Pt单原子(PtSA)配位,还能诱导一个表面晶格氧向PtSA移动,从而促进热力学稳定的Pt―O4物种的形成,这一点通过在氧气氛围而非惰性氛围中实验合成TiO2上的PtSA得到了验证。所获得的稳定PtSA-TiO2光催化剂在共生产高纯度氢气和附加值乙醛时,表现出320.4 mmol·g−1·h−1的光催化速率,选择性高达99.65%,其活性是负载Pt纳米颗粒的TiO2的三倍。该策略进一步扩展至其他贵金属,如Rh和Pd。

关键词: 金属单原子, 表面重构, 热稳定性, 光催化, 氢气

Abstract:

The intrinsic surface atomic configuration of photocatalyst without unstable or difficult-to-generate atomic vacancies often limits the formation of effective interaction between metal single atom (MSA) cocatalyst and photocatalyst, thus inhibiting the stability and performance improvement of single-atom photocatalysts. In this study, we present a convenient and cost-effective photochemical oxygen reduction reaction (ORR) mechanism to prepare thermodynamically stable noble metal single-atom cocatalysts on TiO2 photocatalyst under mild condition (only consuming water and oxygen at 101325 Pa and 25 ℃). The first-principles simulation firstly theoretically reveals that the intrinsic surface configuration of TiO2 can only produce unstable Pt―O2 structure. However, ORR occurring on TiO2 can not only provide one foreign oxygen to coordinate with Pt single atom (PtSA), but also induce one surface lattice oxygen to move toward PtSA, promoting the formation of one thermodynamically stable Pt―O4 species, demonstrated by the experimental synthesis of PtSA on TiO2 in oxygen atmosphere instead of inert atmosphere. The obtained stable PtSA-TiO2 photocatalysts exhibit a photocatalytic rate of 320.4 mmol·g−1·h−1 for the coproduction of high-purity hydrogen and value-added acetaldehyde with a selectivity of 99.65%, three-fold higher than the activity of Pt nanoparticles-loaded TiO2. This strategy is further extended to other noble metals, such as Rh and Pd.

Key words: Metal single atom, Surface reconstruction, Thermal stability, Photocatalysis, Hydrogen