Piezoelectric potential enhanced photocatalytic performance based on ZnO with different nanostructures

In this paper, two novel nanostructures with ZnO nanowire and nanosheet arrays vertically growing on the FTO and Al foil have been synthesized by a hydrothermal method, which exhibit both the piezoelectric and photocatalytic properties. These nanostructures have typical wurtzite structures based on the XRD results. From the SEM results, the average diameter and length of nanowire have been measured to be about 150 nm and 4.5 mu m, the thickness of ZnO nanosheet is about 50 nm and the width is about 5 mu m. In the photocatalytic test, the photodegradation of RhB under 365 nm illumination for nanowire and nanosheet is about 25% and 37% in 80 min reaction. With stirring, the degradation rate is increased to 61% and 85%. Finally, the photocurrent test and finite element method were used to analyze the piezo-photodegradation mechanism.

Automated summary

Novel nanostructures of ZnO nanowire and nanosheet arrays were synthesized by a hydrothermal method, exhibiting both piezoelectric and photocatalytic properties with typical wurtzite structures. Under illumination, the nanowires and nanosheets showed increased degradation rates for RhB with longer reaction times and stirring. The piezo-photodegradation mechanism was analyzed using photocurrent testing and finite element method.