Rich surface hydroxyl design for nanostructured TiO2 and its hole-trapping effect

Shi Tian Xiao, Si Ming Wu, Yu Dong, Jia Wen Liu, Li Ying Wang, Lu Wu, Yue Xing Zhang, Ge Tian, Christoph Janiak, Menny Shalom, Yi Tian Wang, Yuan Zhou Li, Ruo Kun Jia, Detlef W. Bahnemann, Xiao Yu Yang

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

The surface hydroxyl groups in TiO2 are crucial to many of its practical applications, but their controlled synthesis represents still a challenge. Herein, nanostructured TiO2 with rich surface hydroxyl species groups and high crystallinity (TiO2-OH) by high-temperature calcination have been developed by using the ionic liquid. Experimental measurements and theoretical calculations show a strong surface hydroxyl signal of two-dimensional 1H TQ-SQ MAS NMR, as well as clear changes of the charge density of TiO2 with the rich surface hydroxyl species. Moreover, the rich surface hydroxyl species groups in TiO2 not only significantly enhance its performances involving photogenerated current, photocatalysis and energy strorage but also show a bright future on marine applications because of its high activity and stability in simulation seawater. The characteristics and mechanism have been proposed to clarify the generation of surface hydroxyl species of TiO2 and the correponding directed hole-trapping at an atomic-/nanoscale.

Original languageEnglish
Article number125909
JournalChemical Engineering Journal
Volume400
DOIs
StatePublished - 15 Nov 2020

Keywords

  • Directed catalysis
  • Hierarchical structure
  • Hydrogen production from seawater
  • Surface hydroxyl
  • Titanium oxide

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