[10p-E215-1~15] CS.10 Code-sharing session of 6.5&7.5

5:00 PM - 5:15 PM JST(8:00 AM - 8:15 AM UTC)

[10p-E215-13] Ambient-Pressure HAXPES Observation of Electronic Structure Dynamics of Anatase TiO₂ Photocatalysts under Water Vapor Atmospheres

〇(M2)Keita Murase¹, Hidetoshi Miyazaki¹, Joji Mizuno¹, Yasumasa Takagi², Satoshi Yasuno², Juhana Jaafar³, Naoko Yoshida⁴ (1.Nitech, 2.JASRI, 3.UTM, 4.Nagoya Univ.)

Keywords:

TiO2,AP-HAXPES

This study employed ambient-pressure hard X-ray photoelectron spectroscopy (AP-HAXPES) to investigate the electronic-state changes of anatase TiO₂ under a water-vapor atmosphere. No significant spectral changes were observed under UV irradiation at a water vapor pressure of 2.5 kPa. In contrast, at 4.4 kPa, the OH^- and H₂O-related components exhibited shifts toward higher binding energies. These shifts are attributed to the oxidation of surface OH^- species and adsorbed water by photogenerated holes under UV irradiation, resulting in a decrease in electron density and a corresponding increase in binding energy.