Constructing Pd/ferroelectric Bi4Ti3O12 nanoflake interfaces for O2 activation and boosting NO photo-oxidation

被引：37
作者：
Zhang, Qian [1 ,2 ]
Shi, Yuanyu [4 ]
Shi, Xianjin [1 ,3 ]
Huang, Tingting [1 ]
Lee, Shuncheng [5 ]
Huang, Yu [1 ,2 ]
Cao, Jun-ji [1 ,2 ]
机构：
[1] Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol SKLLQG, Key Lab Aerosol Chem & Phys, Xian 710061, Peoples R China
[2] CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China
[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[4] Hohai Univ, Nanjing 211100, Peoples R China
[5] Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong, Peoples R China
来源：
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY | 2022年 / 302卷
基金：
中国国家自然科学基金;
关键词：
Ferroelectric polarization; Perovskite nanomaterials; O(2 )activation; Photocatalysis; Air pollution; TIO2; NANOPARTICLES; OXIDATION; OXYGEN; PD; SELECTIVITY; REMOVAL; PHOTOCATALYSIS; NANOSHEETS; REDUCTION;
D O I：
10.1016/j.apcatb.2021.120876
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Photo-oxidative NOx removal often encountered with sluggish charge carrier separation kinetics and poor selectivity. Herein, Pd/ferroelectric Bi4Ti3O12 nanoflakes (Pd/BTO NF) were constructed to investigate the photo-excited charge separation, O2 activation and the generated reactive oxygen species (ROS) in dictating NO removal. Results showed that the depolarization field of ferroelectric BTO NF significantly promoted bulk charge separation, leading to boosted NO removal reaction kinetics (10 times higher) for Pd/BTO NF comparing with Pd/TiO2. Revealed by electronic paramagnetic resonance and radical scavenging tests, it is observed that the primary O2 activation species differed among Pd, Ag and Pt supported BTO NF photocatalysts, which resulted in different selectivity. The underlying mechanism of NO photo-oxidative conversion pathway was studied by in situ diffuse reflectance infrared Fourier transform spectroscopy. This work illustrate that metal/ferroelectric interfaces can be tuned to obtain differing O2 activation species, and notable selectivity changes in photocatalysis mediated environmental remediation reactions.
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页数：13
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