In situ construction of a Sillen Aurivillius layered perovskite-based 0D/2D homologous Schottky junction for efficient piezo-photocatalytic activity

Jian Yang; Yali Xue; Chuang Han

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In situ construction of a Sillen Aurivillius layered perovskite-based 0D/2D homologous Schottky junction for efficient piezo-photocatalytic activity

机译：In situ construction of a Sillen Aurivillius layered perovskite-based 0D/2D homologous Schottky junction for efficient piezo-photocatalytic activity

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The interface shielding effect resulting from the accumulation of charge carriers and the relatively weak driving force provided by the single built-in electric field in conventional heterojunctions seriously hamper the rapid and continuous charge separation. Herein, focusing on Sillen-Aurivillius perovskite-type bismuth tantalum oxyhalides, an ingenious 0D/2D Bi/Bi4TaO8Cl_(0.5)Br_(0.5) (BTOCB) piezoelectric homologous Schottky heterojunction is judiciously designed and fabricated via in situ deposition of Bi nanodots on the surfaces of BTOCB solid solution nanosheets and shows mainly exposed (001) facets and strong piezoelectricity. Rietveld refinements confirm the substitution of Cl and Br in the lattice, and the band structure is regulated by solid solution engineering. Meanwhile, the introduction of Bi improves visible light absorption and creates an internal electric field at the heterointerface. Under the synergetic action of illumination and ultrasonic vibration, the unique multi-internal electric field modulation derived from the piezoelectric polarization and Schottky junction can break the heterointerface shielding effect and deliver powerful driving force for impactful spatial photocarrier migration and separation. As a result, the as-prepared Bi/ BTOCB Schottky junction exhibits outstanding piezo-photocatalyst performance for tetracycline (TC) degradation. Lastly, the possible degradation pathway of TC is proposed, and the toxicity of intermediates is also analyzed. This study demonstrates a strategy of multi-field modulation in optimizing photogenerated carrier behaviors and gives deep insights into the design of high-performance piezo-photocatalysts.

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来源
《Catalysis science & technology》 |2023年第18期|5313-5325|共13页
作者
Jian Yang; Yali Xue; Chuang Han;
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Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China;

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正文语种英语
中图分类物理化学（理论化学）、化学物理学;
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In situ construction of a Sillen Aurivillius layered perovskite-based 0D/2D homologous Schottky junction for efficient piezo-photocatalytic activity

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