P-N junction mechanism on improved NiO/TiO2 photocatalyst
Journal
Catalysis Communications
Journal Volume
12
Journal Issue
14
Pages
1307-1310
Date Issued
2011
Author(s)
Abstract
The composite photocatalyst comprising p-type NiO and n-type TiO 2 showed improved photoactivity due to the inhibition of electron-hole recombination. A series of P-N junction photocatalysts, NiO/TiO2, were prepared by incipient wetness impregnation. The photocatalysts were characterized by UV-vis spectroscopy, XRD and XPS. The photoactivity of photocatalysts was tested by the degradation of methylene blue. The results showed that 0.5 wt.% NiO/TiO2 had the highest activity as compared with TiO2. A P-N junction mechanism was proposed and verified that the photocurrent could be enhanced under forward bias in the NiO/TiO2 film. The photoactivity enhancement is attributed to P-N junction and co-catalyst effects. © 2011 Elsevier B.V.
SDGs
Type
journal article