Scholarlink

<p>Free-electron lasers (FELs) enable the study of the ultrafast dynamics of photocatalytic reactions by time-resolved X-ray photoelectron spectroscopy (tr-XPS) with femtosecond time resolution. In an optical pump - soft X-ray probe photoemission experiment conducted at the free-electron laser in Hamburg (FLASH), we observed the ultrafast oxidation of CO to CO<sub>2</sub> on rutile TiO<sub>2</sub>(110) by monitoring the O 1s core level region. Within 800± 250 fs after laser excitation, CO<sub>2</sub> as a product of the photooxidation of CO is detected. Based on density functional theory calculations, we propose that the oxygen activation pathway for the CO oxidation is initiated via an O<sub>2</sub>-TiO<sub>2</sub> charge transfer complex directly excited by the 770 nm pump laser. Our results give insight into the fundemental understanding of photocatalytic processes of TiO<sub>2</sub> polymorphs relevant for the design of more efficient photoctalaysts.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Dynamics of CO photooxidation to CO2 on rutile (110)

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年3月10日

查看全文
  • Helena Gleissner,
  • Michael Wagstaffe,
  • Lukas Wenthaus,
  • Adrian Domínguez-Castro,
  • Verena Gupta,
  • Simon Chung,
  • Steffen Palutke,
  • Siarhei Dziarzhytski,
  • Dmytro Kutnyakhov,
  • Michael Heber,
  • Günter Brenner,
  • Harald Redlin,
  • Federico Pressacco,
  • Adriel Domínguez Garcia,
  • Thomas Frauenheim,
  • Heshmat Noei,
  • Andreas Stierle

摘要

Free-electron lasers (FELs) enable the study of the ultrafast dynamics of photocatalytic reactions by time-resolved X-ray photoelectron spectroscopy (tr-XPS) with femtosecond time resolution. In an optical pump - soft X-ray probe photoemission experiment conducted at the free-electron laser in Hamburg (FLASH), we observed the ultrafast oxidation of CO to CO2 on rutile TiO2(110) by monitoring the O 1s core level region. Within 800± 250 fs after laser excitation, CO2 as a product of the photooxidation of CO is detected. Based on density functional theory calculations, we propose that the oxygen activation pathway for the CO oxidation is initiated via an O2-TiO2 charge transfer complex directly excited by the 770 nm pump laser. Our results give insight into the fundemental understanding of photocatalytic processes of TiO2 polymorphs relevant for the design of more efficient photoctalaysts.