Self-hydrogenated shell promoting photocatalytic H2 evolution on anatase TiO2

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

16 Scopus Citations
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Author(s)

  • Yue Lu
  • Wen-Jin Yin
  • Kai-Lin Peng
  • Kuan Wang
  • Qi Hu
  • Annabella Selloni
  • Li-Min Liu
  • Man-Ling Sui

Detail(s)

Original languageEnglish
Article number2752
Journal / PublicationNature Communications
Volume9
Publication statusPublished - 16 Jul 2018

Link(s)

Abstract

As one of the most important photocatalysts, TiO2 has triggered broad interest and intensive studies for decades. Observation of the interfacial reactions between water and TiO2 at microscopic scale can provide key insight into the mechanisms of photocatalytic processes. Currently, experimental methodologies for characterizing photocatalytic reactions of anatase TiO2 are mostly confined to water vapor or single molecule chemistry. Here, we investigate the photocatalytic reaction of anatase TiO2 nanoparticles in water using liquid environmental transmission electron microscopy. A self-hydrogenated shell is observed on the TiO2 surface before the generation of hydrogen bubbles. First-principles calculations suggest that this shell is formed through subsurface diffusion of photo-reduced water protons generated at the aqueous TiO2 interface, which promotes photocatalytic hydrogen evolution by reducing the activation barrier for H2 (H-H bond) formation. Experiments confirm that the self-hydrogenated shell contains reduced titanium ions, and its thickness can increase to several nanometers with increasing UV illuminance.

Research Area(s)

  • TIO2(101) SURFACE, WATER, IRRADIATION, INTERFACE, SPECIMENS, DIFFUSION, LIQUID

Citation Format(s)

Self-hydrogenated shell promoting photocatalytic H2 evolution on anatase TiO2. / Lu, Yue; Yin, Wen-Jin; Peng, Kai-Lin; Wang, Kuan; Hu, Qi; Selloni, Annabella; Chen, Fu-Rong; Liu, Li-Min; Sui, Man-Ling.

In: Nature Communications, Vol. 9, 2752, 16.07.2018.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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