Jump to main content
Jump to site search


Impact of oxygen vacancies on TiO2 charge carrier transfer for photoelectrochemical water splitting

Author affiliations

Abstract

Oxygen vacancies are recognized as the most prevalent defects in oxide materials. The effect of oxygen vacancies on the physicochemical properties of metal oxide semiconductors has attracted considerable attention in the photocatalysis field. But so far, the impact of oxygen vacancies on charge carrier transfer for photoelectrochemical water splitting has been unclear. In this work, TiO2 photoanodes with various oxygen vacancy concentrations were studied as metal oxide models to clarify the impact of oxygen vacancies on charge carrier transfer behaviors. The potential distribution and electrochemical impedance spectroscopy results indicate that the oxygen vacancies facilitate charge carrier diffusion in TiO2, but are disadvantageous for the charge carrier drift in the TiO2/electrolyte interface. The TiO2-400 photoanode with intermediate oxygen vacancy concentration exhibits the highest photocurrent density. It is expected that this work will provide reference to design and fabricate oxide semiconductors as photoanodes for higher charge carrier utilization in the field of solar-to-chemical energy conversion.

Graphical abstract: Impact of oxygen vacancies on TiO2 charge carrier transfer for photoelectrochemical water splitting

Back to tab navigation

Supplementary files

Article information


Submitted
12 Nov 2019
Accepted
20 Jan 2020
First published
20 Jan 2020

Dalton Trans., 2020, Advance Article
Article type
Paper

Impact of oxygen vacancies on TiO2 charge carrier transfer for photoelectrochemical water splitting

X. Huang, X. Gao, Q. Xue, C. Wang, R. Zhang, Y. Gao and Z. Han, Dalton Trans., 2020, Advance Article , DOI: 10.1039/C9DT04374H

Social activity

Search articles by author

Spotlight

Advertisements