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

authored by

S.-T. Xiao, S.-M. Wu, Y. Dong, J.-W. Liu, L.-Y. Wang, L. Wu, Y.-X. Zhang, G. Tian, C. Janiak, M. Shalom, Y.-T. Wang, Y.-Z. Li, R.-K. Jia, D.W. Bahnemann, X.-Y. Yang

Abstract

The surface hydroxyl groups in TiO

₂ are crucial to many of its practical applications, but their controlled synthesis represents still a challenge. Herein, nanostructured TiO

₂ with rich surface hydroxyl species groups and high crystallinity (TiO

₂-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 TiO

₂ with the rich surface hydroxyl species. Moreover, the rich surface hydroxyl species groups in TiO

₂ 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 TiO

₂ and the correponding directed hole-trapping at an atomic-/nanoscale.

Organisation(s)

Institute of Technical Chemistry

External Organisation(s)

Wuhan University of Technology
Sun Yat-Sen University
Chinese Academy of Sciences (CAS)
Hubei University
Harvard University
Heinrich-Heine-Universität Düsseldorf
Ben-Gurion University of the Negev
Northeast Electric Power University (NEEPU)
Saint Petersburg State University
Qingdao University

Type

Article

Journal

Chemical engineering journal

Volume

400

ISSN

1385-8947

Publication date

15.11.2020

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

General Chemistry, Environmental Chemistry, General Chemical Engineering, Industrial and Manufacturing Engineering

Sustainable Development Goals

SDG 7 - Affordable and Clean Energy, SDG 14 - Life Below Water

Electronic version(s)

https://doi.org/10.1016/j.cej.2020.125909 (Access: Closed)