Synergetic Effect of Facet Junction and Specific Facet Activation of ZnFe2O4 Nanoparticles on Photocatalytic Activity Improvement
发布时间：2019-11-06
点击次数：
- 论文类型：
- 期刊论文
- 发表时间：
- 2019-08-14
- 发表刊物：
- ACS APPLIED MATERIALS & INTERFACES
- 收录刊物：
- PubMed、SCIE
- 文献类型：
- J
- 卷号：
- 11
- 期号：
- 32
- 页面范围：
- 29004-29013
- ISSN号：
- 1944-8244
- 关键字：
- ZnFe2O4; facet engineering; photocatalytic activity; facet junction; H2O2 activation
- 摘要：
- 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 center dot O-2(-) and (OH)-O-center dot 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)-O-center dot, 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.
- 第一作者
- Li, Jianan
- 合写作者
- Wang, Lianzhou,Wang, Xinyang,Ma, Hangfan,Yin, Zhifan,Li, Xinyong