P-N junction mechanism on improved NiO/TiO2 photocatalyst

Cha Jung Chen; Chi Hung Liao; Kai Chien Hsu; Yi Ting Wu; Jeffrey C.S. Wu

doi:10.1016/j.catcom.2011.05.009

P-N junction mechanism on improved NiO/TiO₂ photocatalyst

Cha Jung Chen, Chi Hung Liao, Kai Chien Hsu, Yi Ting Wu, Jeffrey C.S. Wu

Research output: Contribution to journal › Article › peer-review

119 Scopus citations

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)
Pages (from-to)	1307-1310
Number of pages	4
Journal	Catalysis Communications
Volume	12
Issue number	14
DOIs	https://doi.org/10.1016/j.catcom.2011.05.009
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

Publisher link

10.1016/j.catcom.2011.05.009

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@article{3dd839b736d94900ae07b1149680dc45,

title = "P-N junction mechanism on improved NiO/TiO2 photocatalyst",

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.",

keywords = "NiO, P-N junction, Photocatalysis, TiO",

author = "Chen, {Cha Jung} and Liao, {Chi Hung} and Hsu, {Kai Chien} and Wu, {Yi Ting} and Wu, {Jeffrey C.S.}",

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 . ",

year = "2011",

month = aug,

day = "15",

doi = "10.1016/j.catcom.2011.05.009",

language = "English (US)",

volume = "12",

pages = "1307--1310",

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TY - JOUR

T1 - P-N junction mechanism on improved NiO/TiO2 photocatalyst

AU - Chen, Cha Jung

AU - Liao, Chi Hung

AU - Hsu, Kai Chien

AU - Wu, Yi Ting

AU - Wu, Jeffrey C.S.

N1 - 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 .

PY - 2011/8/15

Y1 - 2011/8/15

N2 - 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.

AB - 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.

KW - NiO

KW - P-N junction

KW - Photocatalysis

KW - TiO

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