Heterogeneous catalysis; Catalysis; Thin Films; Methodology and phenomena; XPS; Microscopy; Spectroscopy and general characterization; photoluminescence; ZnO/NiO; surface modification; band bending; photocatalytic activity
Abstract :
[en] Charge carrier separation is considered as a key factor in enhancing the photocatalytic process and can be maximized by mitigating surface recombination. Following this idea, the surface of zinc oxide (ZnO) was modified by thermal treatment and nickel oxide (NiO) deposition. The influence of the ZnO thermal treatment and NiO deposition conditions on the ZnO surface chemistry and heterostructure interface properties were investigated by in situ X-ray photoelectron spectroscopy (XPS) and photoluminescence (PL) and correlated to the dye photodegradation efficiency. The XPS analysis confirmed a change of doping of ZnO after thermal treatment, which mainly influenced the developed band bending, and has led to an improved photocatalytic activity. For the same reason, the heterostructures based on the surface cleaned ZnO surface had higher photocatalytic efficiency than the ones based on non-cleaned ZnO. The temperature input during NiO deposition had negligible effect on the heterostructure interface properties. The photocatalytic efficiency did not follow the band bending evolution because of a dominant contribution of charge recombination across the NiO layer as indicated by PL analysis.
Disciplines :
Chemistry Physics
Author, co-author :
Periyannan, Shanmugapriya ; Université de Liège - ULiège > Département de chimie (sciences) > LCIS - GreenMAT
Manceriu, Laura ; Université de Liège - ULiège > Département de chimie (sciences) > LCIS - GreenMAT
Nguyen, Ngoc Duy ; Université de Liège - ULiège > Département de physique > Physique des solides, interfaces et nanostructures
KLEIN, Andreas; Technical University of Darmstadt (TUD), Darmstadt, Hessen, Germany > Department of Materials and Geosciences > Surface science division > Professor
JAEGERMANN, Wolfram; Technical University of Darmstadt (TUD), Darmstadt, Hessen, Germany > Department of Materials and Geosciences > Surface science division > Professor
Colson, Pierre ; Université de Liège - ULiège > Département de chimie (sciences) > LCIS - GreenMAT
Henrist, Catherine ; Université de Liège - ULiège > Département de chimie (sciences) > LCIS - GreenMAT
Cloots, Rudi ; Université de Liège - ULiège > Département de chimie (sciences) > Vice-Recteur à la vie étud. et aux infrastr. immobilières
Language :
English
Title :
Influence of ZnO Surface Modification on the Photocatalytic Performance of ZnO/NiO Thin Films
Publication date :
17 April 2019
Journal title :
Catalysis Letters
ISSN :
1011-372X
eISSN :
1572-879X
Publisher :
Kluwer Academic Publishers, Netherlands
Pages :
1-12
Peer reviewed :
Peer Reviewed verified by ORBi
European Projects :
H2020 - 641640 - EJD-FunMat - European Joint Doctorate in Functional Materials Research
Name of the research project :
Metal Oxide Heterostructured films with controlled architecture for enhanced photocatalytic properties
Funders :
Marie Sklodowska Curie Grant through EJD-FunMat (European Joint Doctorate for Multifunctional Materials) CE - Commission Européenne [BE]
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