Oxygen Vacancy-Induced Construction of CoO/h-TiO2 Z‑Scheme Heterostructures for Enhanced Photocatalytic Hydrogen Evolution

Environmentally friendly catalysts with excellent performance and low cost are critical for photocatalysis. Herein, using hydrogenated TiO2 (h-TiO2) nanosheets with enriched oxygen vacancies as the support, two-dimensional CoO/h-TiO2 Z-scheme heterostructures are fabricated for hydrogen production t...

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Bibliographic Details
Published in:ACS applied materials & interfaces 2022-06, Vol.14 (25), p.28945-28955
Main Authors: Chen, Xiaoyu, Sun, Bojing, Chu, Jiayu, Han, Zhi, Wang, Yu, Du, Yunchen, Han, Xijiang, Xu, Ping
Format: Article
Language:English
Subjects:
Energy, Environmental, and Catalysis Applications
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Summary:Environmentally friendly catalysts with excellent performance and low cost are critical for photocatalysis. Herein, using hydrogenated TiO2 (h-TiO2) nanosheets with enriched oxygen vacancies as the support, two-dimensional CoO/h-TiO2 Z-scheme heterostructures are fabricated for hydrogen production through photocatalytic water splitting. It is revealed that the oxygen vacancies in h-TiO2 can inhibit the oxidation of Co2+ into high-valence Co3+ during the hydrothermal reaction and thermal treatment processes. A CoO/h-TiO2 Z-scheme heterostructure possesses a space charge region and a built-in electric field at the interface, and oxygen vacancies in h-TiO2 can provide more reactive sites, which synergistically improve the separation and transportation of photogenerated carriers. As a result, the photocatalytic hydrogen evolution rate achieves 129.75 μmol·h–1 (with 50 mg of photocatalysts) on the optimized CoO/h-TiO2 heterostructures. This work provides a new design idea for the preparation of excellent TiO2-based photocatalysts.
ISSN:1944-8244
1944-8252
DOI:10.1021/acsami.2c06622