High visible light photocatalytic activities obtained by integrating g-C3N4 with ferroelectric PbTiO3
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2021年第15期
论文作者：Tingting Xu Ping Niu Shulan Wang Li Li
摘 要：Graphitic carbon nitride（g-C3N4） with the merits of high visible light absorption, proper electronic band structure with high conduction band edge and variable modulation, is viewed as a promising photocatalyst for practical use. To alleviate its high recombination rate of photo-excited charge carriers and maximize the photocatalytic performances, it is paramount to design highly effective transfer channels for photo-excited charge carriers. Ferroelectric materials can have the charge carriers transport in opposite directions owing to the internal spontaneous polarization, which may be suitable for constructing the heterostructure with g-C3N4 for efficient charge separation. Inspired by this concept, herein ferroelectric PbTiO3, which can be the visible-light absorber, is coupled with g-C3N4 to construct PbTiO3/g-C3N4 heterostructure with close contact via Pb–N bond by the facile post thermal treatment. The optimized Pb TiO3/g-C3N4 heterostructure exhibited excellent photocatalytic and photoelectrochemical activities under visible light irradiation. Moreover, the simultaneous application of ultrasound-induced mechanical waves can further improve its photocatalytic activities through reinforcing the built-in piezoelectric field. This work proposes a widely applicable strategy for the fabrication of high-performance ferroelectric based photocatalysts and also provides some new ideas for developing the understanding of ferroelectric photocatalysis.
Tingting Xu1,2,3，Ping Niu3，Shulan Wang1，Li Li2,3
1. Department of Chemistry, School of Science, Northeastern University2. State Key Laboratory of Rolling and Automation, Northeastern University3. School of Metallurgy, Northeastern University
摘 要：Graphitic carbon nitride（g-C3N4） with the merits of high visible light absorption, proper electronic band structure with high conduction band edge and variable modulation, is viewed as a promising photocatalyst for practical use. To alleviate its high recombination rate of photo-excited charge carriers and maximize the photocatalytic performances, it is paramount to design highly effective transfer channels for photo-excited charge carriers. Ferroelectric materials can have the charge carriers transport in opposite directions owing to the internal spontaneous polarization, which may be suitable for constructing the heterostructure with g-C3N4 for efficient charge separation. Inspired by this concept, herein ferroelectric PbTiO3, which can be the visible-light absorber, is coupled with g-C3N4 to construct PbTiO3/g-C3N4 heterostructure with close contact via Pb–N bond by the facile post thermal treatment. The optimized Pb TiO3/g-C3N4 heterostructure exhibited excellent photocatalytic and photoelectrochemical activities under visible light irradiation. Moreover, the simultaneous application of ultrasound-induced mechanical waves can further improve its photocatalytic activities through reinforcing the built-in piezoelectric field. This work proposes a widely applicable strategy for the fabrication of high-performance ferroelectric based photocatalysts and also provides some new ideas for developing the understanding of ferroelectric photocatalysis.
关键词：
