Enhanced Piezo-Photocatalytic Performance of Na0.5Bi4.5Ti4O15 by High-Voltage Poling

Author:

Lan Shuang1,Zheng Mupeng1ORCID,Zhuo Fangping2ORCID,Zhu Mankang1,Hou Yudong1ORCID

Affiliation:

1. Key Laboratory of Advanced Functional Materials, Faculty of Materials and Manufacturing, Beijing University of Technology, Ministry of Education, Beijing 100124, China

2. Department of Materials and Earth Sciences, Technical University of Darmstadt, 64287 Darmstadt, Germany

Abstract

The internal electric field within a piezoelectric material can effectively inhibit the recombination of photogenerated electron–hole pairs, thus serving as a means to enhance photocatalytic efficiency. Herein, we synthesized a Na0.5Bi4.5Ti4O15 (NBT) catalyst by the hydrothermal method and optimized its catalytic performance by simple high-voltage poling. When applying light and mechanical stirring on a 2 kV mm−1 poled NBT sample, almost 100% of Rhodamine B solution could be degraded in 120 min, and the reaction rate constant reached as high as 28.36 × 10−3 min−1, which was 4.2 times higher than that of the unpoled NBT sample. The enhanced piezo-photocatalytic activity is attributed to the poling-enhanced internal electric field, which facilitates the efficient separation and transfer of photogenerated carriers. Our work provides a new option and idea for the development of piezo-photocatalysts for environmental remediation and pollutant treatment.

Funder

Beijing Natural Science Foundation

National Natural Science Foundation of China

Publisher

MDPI AG

Subject

General Materials Science

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