Band Gap Tuning via Supercritical CO<sub>2</sub>-Induced Exciton Effect in BiFeO<sub>3</sub> for Photocatalytic CO<sub>2</sub> Reduction.
basic_science · Level V
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- Record sourced from PubMed, PMID 40320651.
- Also identified by DOI 10.1021/acs.nanolett.5c01832.
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Abstract
The exciton effect induced by the Coulomb interaction between photogenerated electrons and holes has an important influence on physical processes such as light absorption, luminescence, excitation, and optical nonlinear interaction in semiconductors. However, there are few studies related to photocatalysis based on the exciton effect. For catalysts, dissociation and the coexistence of excitons are obstacles to the generation of carriers. Therefore, converting excitons to carriers will optimize the photocatalytic process. In this paper, we treated BiFeO<sub>3</sub> with supercritical carbon dioxide (SC CO<sub>2</sub>) to strip two-dimensional (2D) BiFeO<sub>3</sub> and introduced oxygen vacancies, which can dissociate excitons into carriers for photocatalytic reduction of CO<sub>2</sub> under visible light. This work guides the development of the photocatalysis of BiFeO<sub>3</sub> from a new view in terms of excitons.