压电效应增强BaTiO3@TiO2光催化析氢性能研究
Enhancement in Photocatalytic Hydrogen Precipitation of BaTiO3@TiO2 through Piezoelectric Effect
李明通 1周建华1
作者信息
- 1. 桂林电子科技大学材料科学与工程学院,广西电子信息材料重点实验室,广西桂林 541004
- 折叠
摘要
光催化产氢受到催化剂光吸收范围窄和催化剂活性低等技术瓶颈的制约.采用简单水热法合成了光催化压电复合材料BaTiO3@TiO2纳米花.通过XRD、SEM、TEM等测试手段对产物结构、形貌进行了表征,并以搅拌作为外在压力,深入研究了不同搅拌转速对复合材料光催化析氢性能的影响.实验结果表明,TiO2在BaTiO3纳米球表面被紧密修饰,建立了紧密接触的Ⅱ型能带结构.BaTiO3@TiO2-1.2在搅拌转速为900 r·min-1时的析氢速率高达45.48 μmol·g-1·h-1,是低转速300 r·min-1时的7.19倍.该优异的光催化析氢性能可归因于压电场的反复变化促进光生载流子转移和电荷分离.
Abstract
Photocatalytic hydrogen production is constrained by technical bottlenecks,such as narrow light absorption range of the catalyst and low catalyst activity.Photocatalytic piezoelectric composite BaTiO3@TiO2 nanoflowers were synthesized by using a simple hydrothermal method.The structure and morphology were characterized by using XRD,SEM and TEM,while the effect of stirring speed on photocatalytic hydrogen precipitation performance of the composites was deeply studied by using stirring as the external pressure.It is observed that TiO2 was tightly anchored on surface of the BaTiO3 nanospheres,whereas a close-contact type Ⅱ energy band structure was established.The BaTiO3@TiO2-1.2 sample exhibited a hydrogen precipitation rate of as high as 45.48 μmol·g-1·h-1,at a stirring rotational speed of 900 r·min-1,which was higher than that at a low rotational speed(300 r·min-1)by 7.19 times.The excellent photocatalytic hydrogen precipitation performance can be attributed to the repeated changes of piezoelectric field that has promoted the photogenerated carrier transfer and charge separation.
关键词
BaTiO3@TiO2异质结/压电辅助光催化/析氢反应/Ⅱ型异质结/载流子分离Key words
BaTiO3@TiO2 heterojunction/piezo-assisted photocatalysis/hydrogen evolution/type-Ⅱ heterojunction/charge separation引用本文复制引用
基金项目
国家自然科学基金(52173094)
桂林市科技计划项目(2022010-1)
出版年
2024
国家科技期刊平台
NSTL
万方数据