期刊
ACS APPLIED MATERIALS & INTERFACES
卷 14, 期 25, 页码 28945-28955出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c06622
关键词
hydrogenated TiO2 nanosheets; cobalt oxide; Z-scheme heterostructure; photocatalysis; hydrogen evolution
资金
- National Natural Science Foundation of China [21871065, 22071038]
- Heilongjiang Touyan Team [HITTY-20190033]
- Interdisciplinary Research Foundation of HIT [IR2021205]
Environmentally friendly catalysts with excellent performance and low cost are crucial for photocatalysis. In this study, a two-dimensional CoO/h-TiO2 heterostructure was fabricated using hydrogenated TiO2 nanosheets with enriched oxygen vacancies as the support, and it showed a significantly improved photocatalytic hydrogen evolution rate through effective inhibition of Co2+ oxidation and enhanced separation and transportation of photogenerated carriers.
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/hTiO2 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 mu molmiddoth-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.
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