期刊
SOLAR RRL
卷 6, 期 1, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.202100587
关键词
in situ irradiated X-ray photoelectron spectroscopy; internal electrical field; p-type semiconductors; S-scheme heterojunction; work function
资金
- National Natural Science Foundation of China [51961135303, 51872220, 51932007, 21871217, 52073223, U1905215, U1705251]
- Fundamental Research Funds for the Central Universities [WUT: 2021IVA137]
- open project of Guangxi Key Laboratory of Chemistry and Engineering of Forest Products [GXFK1904]
- Specific Research Project of Guangxi for Research Bases and Talents [guike AD18126005]
The study demonstrates enhanced CO2 photoreduction activity through an S-scheme BiOBr/NiO heterojunction, showcasing improved understanding of the mechanism through integration of in situ monitoring techniques with density functional theory calculation.
Artificial photosynthesis by CO2 photoreduction is an ideal channel for mitigating the greenhouse effect and energy crises. Nevertheless, its efficiency is still low due to severe charge recombination and sluggish kinetics. Herein, an S-scheme BiOBr/NiO heterojunction, composed of two kinds of p-type semiconductors, exhibits enhanced CO2 photoreduction activity. Enhanced light absorption and specific surface area are attributable to NiO nanosheets with hierarchical porous structures. Results from in situ irradiated X-ray photoelectron spectroscopy and work function calculation manifest that the photoexcited electrons transfer from BiOBr to NiO via the S-scheme mechanism. And charge separation and a strong redox ability are simultaneously realized. In situ diffuse reflectance infrared Fourier transform spectra unveil complex intermediates in CO2 photoreduction. This work presents a novel understanding for the CO2 photoreduction mechanism of S-scheme heterojunctions built by p-type semiconductors by integrating in situ monitoring techniques with density functional theory calculation.
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