Synergetic Effect of Facet Junction and Specific Facet Activation of ZnFe2O4 Nanoparticles on Photocatalytic Activity Improvement
| Autor: | Xinyong Li, Xinyang Wang, Lianzhou Wang, Jianan Li, Zhifan Yin, H. T. Ma |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
business.industry Spinel Nanoparticle 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Hydrothermal circulation 0104 chemical sciences law.invention Crystal Semiconductor law engineering Photocatalysis General Materials Science Facet 0210 nano-technology business Electron paramagnetic resonance |
| Zdroj: | ACS Applied Materials & Interfaces. 11:29004-29013 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.9b11836 |
| Popis: | Crystal facet engineering has been proved as a versatile approach in modulating the photocatalytic activity of semiconductors. However, the facet-dependent properties and underlying mechanisms of spinel ZnFe2O4 in photocatalysis still have rarely been explored. Herein, ZnFe2O4 nanoparticles with different {001} and {111} facets exposed were successfully synthesized via a facile hydrothermal method. Facet-dependent photocatalytic degradation performance toward gaseous toluene under visible light irradiation was observed, where truncated octahedral ZnFe2O4 (ZFO(T)) nanoparticles with both {001} and {111} facets exposed exhibited a superior performance than the others. The formed surface facet junction between {010} and {100} facets was responsible for the improved activity by separating photogenerated e-/h+ pairs efficiently to reduce their recombination rate. Photogenerated electrons and holes were demonstrated to be immigrated onto {001} and {111} facets, separately. Intriguingly, electron paramagnetic resonance trapping results indicated that both •O2- and •OH were abundantly present in the ZFO(T) sample under visible light irradiation as major reactive oxygen species involved in the photocatalytic degradation process. Additionally, further investigation revealed that {001} facets played a predominant role in activating photogenerated transient species H2O2 into •OH, beneficially boosting the intrinsic photocatalytic activity. This work has not only presented a promising strategy in regulating photocatalytic performance through the synergetic effect of facet junction and specific facet activation but also broadened the application of facet engineering with multiple effects simultaneously cooperating. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|