Journal
ADVANCED SCIENCE
Volume 7, Issue 16, Pages -Publisher
WILEY
DOI: 10.1002/advs.202000204
Keywords
oxygen vacancies; photothermal catalysis; solar energy; solution plasma
Categories
Funding
- Natural Science Foundation of China [91833303, 51072032, 51102001, 51872044]
- Jilin Province Science and Technology Development Project [20180101175JC]
- 111 Project [B13013]
- Jilin Provincial Education Department Project [JJKH20201162KJ]
- Fundamental Research Funds for the Central Universities [2412019FZ039]
- Japan Science and Technology Agency (JST)
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Colored wide-bandgap semiconductor oxides with abundant mid-gap states have long been regarded as promising visible light responsive photocatalysts. However, their catalytic activities are hampered by charge recombination at deep level defects, which constitutes the critical challenge to practical applications of these oxide photocatalysts. To address the challenge, a strategy is proposed here that includes creating shallow-level defects above the deep-level defects and thermal activating the migration of trapped electrons out of the deep-level defects via these shallow defects. A simple and scalable solution plasma processing (SPP) technique is developed to process the presynthesized yellow TiO(2)with numerous oxygen vacancies (Ov), which incorporates hydrogen dopants into the TiO(2)lattice and creates shallow-level defects above deep level of Ov, meanwhile retaining the original visible absorption of the colored TiO2. At elevated temperature, the SPP-treated TiO(2)exhibits a 300 times higher conversion rate for CO(2)reduction under solar light irradiation and a 7.5 times higher removal rate of acetaldehyde under UV light irradiation, suggesting the effectiveness of the proposed strategy to enhance the photoactivity of colored wide-bandgap oxides for energy and environmental applications.
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