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Oxygen vacancies and p-n heterojunction modified BiOBr for enhancing donor density and separation efficiency under visible-light irradiation
- Source :
- Journal of Alloys and Compounds. 834:155025
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- It remains a great challenge to overcome the problems of poor conductivity and rapid charge recombination in bismuth oxybromide (BiOBr). Herein, for the first time we report the synergistic effect of oxygen vacancies (Ov) and p-n heterojunction to improve photoelectrochemical performance of BiOBr. Benefitting from the new electron donor level caused by oxygen vacancies, the visible-light absorption region, carrier concentration and exposure of {001} facets of BiOBr are all increased. In the meantime, the 2D p-n heterojunction between BiOBr and BiOI leads to a built-in electric field and thus significantly accelerating the charge separation and transfer. Upon visible light irradiation, the resulted BiOBr-Ov/BiOI photoanode presents robust photoelectrochemical performance, achieving a photocurrent density of 1.33 mA/cm2 at 1.23 V vs. RHE. This work not only provides new insight for designing efficient photoelectrodes but also highlights the importance of oxygen defect-engineering strategy in photoelectrochemical water splitting.
- Subjects :
- Photocurrent
Materials science
Mechanical Engineering
Metals and Alloys
chemistry.chemical_element
Heterojunction
Electron donor
02 engineering and technology
Conductivity
010402 general chemistry
021001 nanoscience & nanotechnology
Photochemistry
01 natural sciences
Oxygen
0104 chemical sciences
chemistry.chemical_compound
chemistry
Mechanics of Materials
Electric field
Materials Chemistry
Water splitting
0210 nano-technology
Absorption (electromagnetic radiation)
Subjects
Details
- ISSN :
- 09258388
- Volume :
- 834
- Database :
- OpenAIRE
- Journal :
- Journal of Alloys and Compounds
- Accession number :
- edsair.doi...........cf34a4746ca5d25bfa1b3d051452f54d