期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 596, 期 -, 页码 288-296出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.03.040
关键词
Piezocatalysis; BaTiO3; Dye decomposition; Hydrogen generation; Nanosheets
资金
- Major Science and Technology Programs of Yunnan [202002AB0800011]
- Beijing Municipal Science and Technology Project [Z191100004819002]
- National Natural Science Foundation of China [91963114]
- National Key Research and Development Program of China [2018YFB0704301]
This study significantly improves the piezocatalytic activity of BaTiO3 nanocrystals through morphology engineering rather than composition design. It demonstrates that 2D morphology in nanosheets greatly enhances piezocatalytic activity, which is dominated by morphology-dependent piezoelectricity.
Piezocatalysis, converting mechanical vibration into chemical energy, is an emerging technology to address environmental issues. In this work, we propose an efficient method to significantly improve the piezocatalytic activity by morphology engineering rather than composition design. The catalytic property in BaTiO3 nanocrystallites with diverse morphologies is investigated by dye degradation and hydrogen production under ultrasonic vibration. The BaTiO3 nanosheets exhibit an excellent piezocatalytic activity with a degradation rate of 0.1279 min(-1) for Rhodamine B, far beyond those in previous piezocatalytic literature and even comparable to excellent photocatalysts, and also a high hydrogen production rate of 92 lmol g(-1) h(-1). Compared with nanowires and nanoparticles, the 2D morphology greatly enhances the piezocatalytic activity in nanosheets owing to much larger piezoelectric potential. This proves that the piezocatalytic property is dominated by the morphology-dependent piezoelectricity, rather than specific surface area as other catalysis. Dominated by bending vibrating mode, the piezocatalytic activity reaches a maximum at the piezoelectric resonating frequency, and it increases with the ultrasonic power. Moreover, it has good reusability and wide versatility for catalytic degradation. This work gives an in-depth understanding of piezocatalytic mechanism and provides a way to develop high performance and eco-friendly piezocatalysts. (C) 2021 Elsevier Inc. All rights reserved.
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