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.
Original language | English (US) |
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Pages (from-to) | 1307-1310 |
Number of pages | 4 |
Journal | Catalysis Communications |
Volume | 12 |
Issue number | 14 |
DOIs | |
State | Published - Aug 15 2011 |
Externally published | Yes |
Bibliographical note
Funding Information:The authors would like to acknowledge the National Science Council of Taiwan for financial support of this research under contracts NSC 99-2923-E-002-002-MY2 and NSC 99-2120-M-002-012 .
Keywords
- NiO
- P-N junction
- Photocatalysis
- TiO