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Research Article

Atomic-level unveiling secondary recrystallization enabled micro- and macroscopic polarization enhancement for piezo-photocatalytic oxygen activation

Kai Lin1, Zijian Zhu1, Weiyi Ge1, Tianxing Jiang2, Hongwei Huang1( )
Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources, Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Material Sciences and Technology, China University of Geosciences (Beijing), Beijing 100083, China
School of Chemistry, Beihang University, Beijing 100191, China
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Graphical Abstract

Strongly polarized Bi2WO6 nanosheets are synthesized by secondary recrystallization, which allows extra ~ 20% distortion of [WO6] octahedron and superposition of polar units along ab plane. The simultaneous micro- and macroscopic polarization enhancement results in largely enhanced piezo-photocatalytic oxygen activation for reactive oxygen species production.

Abstract

Piezoelectric semiconductors bear the bifunctional photocatalysis and piezocatalysis, while the absent or weak internal charge driving force severely restricts its catalytic activity. Developing polarization strategy is desirable, and particularly understanding its mechanism from a microscopic perspective remains scanty. Herein, we report a secondary recrystallization approach to achieving the simultaneous micro- and macroscopic polarization enhancement on Bi2WO6 nanosheets for boosting piezo-photocatalytic oxygen activation, and unravel the mechanism at an atom-level. The secondary recrystallization process not only results in a strengthened distortion of [WO6] octahedra with distortion index enhancement by ～ 20% for a single octahedron, but also enables lateral crystal growth of nanosheets along the ab plane (av. 50 to 180 nm), which separately allows the rise in dipole moment of unit cell (e.g., 1.63 D increase along a axis) and the stacking of the distorted [WO6] octahedron to accumulate the unit cell dipole, collectively contributing to the considerably strengthened spontaneous polarization and piezoelectricity. Besides, exposure of large-area {001} front facet enables more efficient capture and conversion of stress into piezo-potential. Therefore, the well-recrystallized Bi2WO6 nanosheets exhibit considerably promoted piezo-photocatalytic reactive oxygen species generation, given the decreased specific surface area. This work presents a feasible methodology to regulate inside-out polarization for guiding carriers transfer behavior, and may advance the solid understanding on the intrinsic mechanism.

Keywords

secondary recrystallizationpiezo-photocatalytic oxygen activationoctahedron distortionpolar units stackingmicro- and macroscopic polarization enhancement

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Nano Research
Volume 17 Issue 6,
June 2024
Pages 5040-5049
DOI: 10.1007/s12274-024-6518-4
Cite this article:
Lin K, Zhu Z, Ge W, et al. Atomic-level unveiling secondary recrystallization enabled micro- and macroscopic polarization enhancement for piezo-photocatalytic oxygen activation. Nano Research, 2024, 17(6): 5040-5049. https://doi.org/10.1007/s12274-024-6518-4
Topics:
Oxygen evolution reaction

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Received: 04 January 2024
Revised: 22 January 2024
Accepted: 25 January 2024
Published: 15 March 2024
© Tsinghua University Press 2024
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