Insights into Interface Charge Extraction in a Noble-Metal-Free Doped Z-Scheme [email protected] Heterojunction

It is of great significance to thoroughly explore the interface charge extraction and migration in heterojunction systems, which could guide us to synthesize higher-efficiency photocatalytic materials. A novel noble-metal-free doped Z-scheme NiO@BiOCl heterojunction was found in this work. The corre...

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Bibliographic Details
Published in:Catalysts 2020-01, Vol.10 (9), p.958
Main Authors: Yang, Jun, Zhu, Quanxi, Xie, Taiping, Wang, Jiankang, Yuan, Peng, Wang, Yajing, Liu, Chenglun, Xu, Longjun
Format: Article
Language:English
Subjects:
Bands
Catalysts
Chemical potential
Chemical reactions
Crystal surfaces
Efficiency
Electron paramagnetic resonance
Electron spin
First principles
Heterojunctions
Heterostructures
Hydroxyl radicals
Light
Mathematical analysis
Nanoparticles
Nickel oxides
Noble metals
Oxygen production
Photocatalysis
Photodegradation
Photoluminescence
Photolysis
Spectrum analysis
Spin resonance
Vibration
Wastewater treatment
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Summary:It is of great significance to thoroughly explore the interface charge extraction and migration in heterojunction systems, which could guide us to synthesize higher-efficiency photocatalytic materials. A novel noble-metal-free doped Z-scheme NiO@BiOCl heterojunction was found in this work. The corresponding heterostructure, interface electron extraction, and electron migration were investigated via first-principles calculation. 5,5′-dimethyl-1-pyrroline-N-oxide (DMPO) spin-trapping electron spin resonance (ESR) and time-resolved photoluminescence (TRPL) tests were implemented to confirm the calculation results, which showed that electrons and holes stayed in the NiO (100) facet and BiOCl (110) facet, respectively. Owing to the large chemical potential of 2.40 V (vs ENHE) for the BiOCl valence-band hole, it possessed super activity to oxidize water into hydroxyl radicals or molecular oxygen. We hope this promising multifunctional photocatalytic material, therefore, NiO@BiOCl can be applied in advanced treatment of organic wastewater and oxygen production from photolysis water.
ISSN:2073-4344
DOI:10.3390/catal10090958