Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 662, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2023.130995
Keywords
BiOCl; BiOBr; O vacancies; Visible light; Photocatalytic ammonia synthesis
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In this study, BiOCl and BiOBr photocatalysts with abundant O vacancies were synthesized for photocatalytic reduction of nitrogen to ammonia. The results showed that the ammonia generation rates of BiOCl and BiOBr with O vacancies were significantly higher than those of pure BiOCl and BiOBr. The O vacancies narrowed the band gap of BiOX and reduced the energy requirement for visible-light excited carrier generation. The O vacancies not only enriched photogenerated electrons but also promoted the transfer of more electrons to N2 molecules, thereby facilitating photocatalytic N2 reduction reaction.
In this work, BiOCl and BiOBr photocatalysts containing abundant O vacancies were synthesized for photo -catalytic reduction of nitrogen to ammonia. The experimental results show that the ammonia generation rates of BiOCl and BiOBr constructed with O vacancies reach 40.51 mu mol g-1 h-1 and 49.66 mu mol g -1 h- 1, respectively, which are significantly higher than those of pure BiOCl and BiOBr. The band gap, XPS characterization, and DFT calculations demonstrate that O vacancies narrow the band gap of BiOX and reduce the energy requirement for visible-light excited carrier generation. As a chemisorption site, it is not only a place where photogenerated electrons are enriched, but also promotes the transfer of more photogenerated electrons to N2 molecules through the O vacancies, thereby promoting the photocatalytic N2 reduction reaction.
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