Enhancement in Photocatalytic Hydrogen Precipitation of BaTiO3@TiO2 through Piezoelectric Effect
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.
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