Volume 61, Issue 44 e202210700
Research Article

Piezo-Photocatalytic Synergy in BiFeO3@COF Z-Scheme Heterostructures for High-Efficiency Overall Water Splitting

Dr. Mei-Ling Xu

Dr. Mei-Ling Xu

School of Materials Science and Engineering, University of Jinan, Jinan, 250022 P. R. China

Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan, 250022 P. R. China

These authors contributed equally to this work.

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Meng Lu

Meng Lu

School of Chemistry, South China Normal University, Guangzhou, 510006 P. R. China

These authors contributed equally to this work.

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Guan-Ying Qin

Guan-Ying Qin

School of Materials Science and Engineering, University of Jinan, Jinan, 250022 P. R. China

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Xiu-Mei Wu

Xiu-Mei Wu

School of Materials Science and Engineering, University of Jinan, Jinan, 250022 P. R. China

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Ting Yu

Ting Yu

School of Materials Science and Engineering, University of Jinan, Jinan, 250022 P. R. China

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Prof. Li-Na Zhang

Prof. Li-Na Zhang

Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan, 250022 P. R. China

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Prof. Kui Li

Corresponding Author

Prof. Kui Li

School of Materials Science and Engineering, University of Jinan, Jinan, 250022 P. R. China

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Prof. Xin Cheng

Corresponding Author

Prof. Xin Cheng

Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan, 250022 P. R. China

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Prof. Ya-Qian Lan

Corresponding Author

Prof. Ya-Qian Lan

School of Chemistry, South China Normal University, Guangzhou, 510006 P. R. China

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First published: 13 September 2022
Citations: 231

Graphical Abstract

We combined covalent organic frameworks (COFs) and piezoelectric material by covalent bonds to form a Z-scheme core@shell heterostructure piezo-photocatalyst with tunable shell thickness for overall water splitting. The optimal sample reveals the unprecedented H2 and O2 production rates of 1416.4 and 708.2 μmol h−1 g−1 under the excitation of ultrasonication coupled with visible light irradiation.

Abstract

Solar-driven overall water splitting is an ideal way to generate renewable energy while still challenging. For the first time, this work combined covalent organic frameworks (COFs) and piezoelectric material by covalent linkages to form Z-scheme core@shell heterostructure for overall water splitting. Benefiting from the synergistic effect between the polarized electric field and photo-generated charges, as well as the precise adjustment of shell thickness, the carrier separation and utilization efficiency is greatly improved. The optimal BiFeO3@TpPa-1-COF photocatalyst revealed hydrogen (H2) and oxygen (O2) production rates of 1416.4 and 708.2 μmol h−1 g−1 under the excitation of ultrasonication coupled with light irradiation, which is the best performance among various piezo- and COF-based photocatalysts. This provides a new sight for the practical application of highly efficient photocatalytic overall water splitting.

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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