Crystal Facet Engineering and Hydrogen Spillover-Assisted Synthesis of Defective Pt/TiO 2- x Nanorods with Enhanced Visible Light-Driven Photocatalytic Activity

• Published in: ACS applied materials & interfaces 2022-01, Vol.14 (1), p.2291-2300
• Main Authors: Yamazaki, Yukari, Toyonaga, Tetsuya, Doshita, Naoto, Mori, Kohsuke, Kuwahara, Yasutaka, Yamazaki, Suzuko, Yamashita, Hiromi
• Format: Article
• Language: English
• ISSN: 1944-8244; 1944-8252
• DOI: 10.1021/acsami.1c20148

Hydrogen spillover can assist the introduction of defects such as Ti and concomitant oxygen vacancies (V ) in a TiO crystal, thereby inducing a new level below the conduction band to improve the conductivity of photogenerated electrons and the visible light absorption property of TiO . Meanwhile, crystal facet engineering offers a promising approach to achieve improved activity by influencing the recombination step of the photogenerated electrons and holes. In this study, with the aim of achieving enhanced visible light-driven photocatalytic activity, rutile TiO nanorods with different aspect ratios were synthesized by crystal facet engineering, and Pt-deposited TiO nanorods (Pt/TNR) were then obtained via reduction treatment assisted by hydrogen spillover. The reduction treatment at 200 °C induced the formation of surface Ti exclusively, whereas surface Ti and V were formed by performing the reduction at 600 °C. The Pt/TNR with a higher aspect ratio reduced at 200 °C exhibited the highest activity in photocatalytic H production under visible light irradiation owing to the synergistic effect of the introduction of Ti defects and the spatial charge carrier separation induced by crystal facet engineering.