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

• Published in: Applied catalysis. B, Environmental Vol. 302; p. 120876
• Main Authors: Zhang, Qian, Shi, Yuanyu, Shi, Xianjin, Huang, Tingting, Lee, Shuncheng, Huang, Yu, Cao, Jun-ji
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.03.2022; Elsevier BV
• Subjects: Air pollution; Bismuth titanate; Current carriers; Depolarization; Environmental cleanup; Ferroelectric materials; Ferroelectric polarization; Ferroelectricity; Fourier transforms; Interfaces; Kinetics; O2 activation; Oxidation; Palladium; Paramagnetic resonance; Perovskite nanomaterials; Photocatalysis; Photooxidation; Reaction kinetics; Reactive oxygen species; Scavenging; Selectivity; Separation; Silver; Titanium dioxide; O2 activation; Air pollution; Perovskite nanomaterials; Ferroelectric polarization; Photocatalysis
• ISSN: 0926-3373; 1873-3883
• DOI: 10.1016/j.apcatb.2021.120876

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. [Display omitted] ●Microwave heating was employed for synthesis of ferroelectric Bi4Ti3O12 nanoflakes.●Noble metal/Bi4Ti3O12 NF were constructed for O2 activation and NO photooxidation.●Pd/BTO NF showed superior performance due to depolarization electric field.●Only ·O2- were detected for Pd/BTO NF to contribute to the high selectivity.●OVs at the BTO NF surface altered the generation of ROS and selectivity.