| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 64951 | Journal of Molecular Catalysis A: Chemical | 2015 | 7 Pages |
•Bi2O3/BiOCl (0 0 1) has been successfully synthesized by in situ chemical transformation.•The prepared sample Bi2O3/BiOCl (0 0 1) is core–shell heterojunction.•Definitive VB and CB of Bi2O3/BiOCl were experimentally confirmed by VB offset.
In order to develop low-cost photocatalyst, commercial Bi2O3 was utilized as raw material to prepare α-Bi2O3/BiOCl core-shell heterojunction via a facile in situ chemical transformation method. To clarify experimentally the band alignment relationships between the α-Bi2O3 and BiOCl (0 0 1), the α-Bi2O3/BiOCl (0 0 1) core–shell heterojunction band offsets were analyzed by X-ray photoelectron spectroscopy (XPS). Here based on energy gaps, valence band values of α-Bi2O3 and BiOCl (0 0 1), core levels difference of Bi 4f in α-Bi2O3/BiOCl (0 0 1) heterojunction, we demonstrate that band alignment of ∼0.28 eV exists between α-Bi2O3 and BiOCl with α-Bi2O3 possessing the higher valence band potential or electron affinity which is a driving force of valence band holes from α-Bi2O3 to BiOCl (0 0 1). While, the electrons in conduction band were driven to migrate through conduction band potential difference (0.49 eV) from BiOCl (0 0 1) to α-Bi2O3.
Graphical AbstractFigure optionsDownload full-size imageDownload high-quality image (75 K)Download as PowerPoint slide
