Surface Engineering to Reduce the Interfacial Resistance for Enhanced Photocatalytic Water Oxidation

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Embargoed until: 2021-07-10
Author(s)
Yan, Junqing
Liu, Jing
Ji, Yujin
Batmunkh, Munkhbayar
Li, Dan
Liu, Xiaoshuang
Cao, Xingzhong
Li, Youyong
Liu, Shengzhong
Ma, Tianyi
Griffith University Author(s)
Year published
2020
Metadata
Show full item recordAbstract
Interfacial resistance of the charge carriers across TiO2 to cocatalysts is one of the main limiting factors for realizing high photocatalytic efficiency of water oxidation. Herein, an amorphous TiOx layer is introduced on the surface of crystalline TiO2 catalyst to form the core–shell structure (am@TiO2) via an oxidation corrosion method. Owing to the surface disordered Ti–O layer, the obtained am@TiO2 exposes abundant −OH groups for the homogeneous loading of nanosized IrOx, while the charge carrier interfacial migration is substantially enhanced. The as-prepared IrOx-am@TiO2 exhibits photocatalytic water oxidation performance ...
View more >Interfacial resistance of the charge carriers across TiO2 to cocatalysts is one of the main limiting factors for realizing high photocatalytic efficiency of water oxidation. Herein, an amorphous TiOx layer is introduced on the surface of crystalline TiO2 catalyst to form the core–shell structure (am@TiO2) via an oxidation corrosion method. Owing to the surface disordered Ti–O layer, the obtained am@TiO2 exposes abundant −OH groups for the homogeneous loading of nanosized IrOx, while the charge carrier interfacial migration is substantially enhanced. The as-prepared IrOx-am@TiO2 exhibits photocatalytic water oxidation performance with an O2 evolution rate of 143.6 μmol/g·h, which is approximately 14 times higher than that of the bare am@TiO2. Moreover, an apparent quantum yield (AQY) of 18.99% is obtained under LED-405 illumination. This work provides a direction for improving the photocatalytic performance and helps to gain a fundamental understanding of the water oxidation steps.
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View more >Interfacial resistance of the charge carriers across TiO2 to cocatalysts is one of the main limiting factors for realizing high photocatalytic efficiency of water oxidation. Herein, an amorphous TiOx layer is introduced on the surface of crystalline TiO2 catalyst to form the core–shell structure (am@TiO2) via an oxidation corrosion method. Owing to the surface disordered Ti–O layer, the obtained am@TiO2 exposes abundant −OH groups for the homogeneous loading of nanosized IrOx, while the charge carrier interfacial migration is substantially enhanced. The as-prepared IrOx-am@TiO2 exhibits photocatalytic water oxidation performance with an O2 evolution rate of 143.6 μmol/g·h, which is approximately 14 times higher than that of the bare am@TiO2. Moreover, an apparent quantum yield (AQY) of 18.99% is obtained under LED-405 illumination. This work provides a direction for improving the photocatalytic performance and helps to gain a fundamental understanding of the water oxidation steps.
View less >
Journal Title
ACS Catalysis
Volume
10
Issue
15
Copyright Statement
This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Catalysis, © 2020 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acscatal.0c02063
Subject
Inorganic Chemistry
Organic Chemistry
Chemical Engineering
Science & Technology
Physical Sciences
Chemistry, Physical
Chemistry
TiO2