Defect-Induced Band Gap Narrowed CeO2 Nanostructures for Visible Light Activities

Title
Defect-Induced Band Gap Narrowed CeO2 Nanostructures for Visible Light Activities
Author(s)
조무환칸모하마드만숩사지드안자리Debabrata Pradhan[Debabrata Pradhan]한도흥이진태
Keywords
ELECTROCHEMICALLY ACTIVE BIOFILM; CERIUM OXIDE NANOPARTICLES; ELECTRON-BEAM; OPTICAL-PROPERTIES; OXYGEN VACANCIES; PHOTOELECTROCHEMICAL PERFORMANCE; PHOTOCATALYTIC ACTIVITY; RECENT PROGRESS; THIN-FILMS; TIO2
Issue Date
201406
Publisher
AMER CHEMICAL SOC
Citation
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, v.53, no.23, pp.9754 - 9763
Abstract
This work reports an electron beam irradiation (30 kGy and 90 kGy) approach to narrow the band gap of the pristine CeO2 nanostructure (p-CeO2) to enhance their visible light activity through defect engineering. This was confirmed by diffuse reflectance spectroscopy, photoluminescence, Raman spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller, electrochemical impedance spectroscopy, and linear scan voltammetry. XPS revealed changes in the surface states, composition, Ce4+ to Ce3+ ratio, and other defects in the modified CeO2 nanostructures (m-CeO2). The m-CeO2 exhibits excellent photocatalytic activities by degrading 4-nitrophenol and methylene blue in the presence of visible light (lambda > 400 nm) compared to the p-CeO2. The optical, photocatalytic, and photoelectrochemical studies and proposed mechanism further support the enhanced visible light photocatalytic activities of the m-CeO2. This study confirmed that defect-induced band gap engineered m-CeO2 could be used effectively as photocatalyst and photoelectrodes owing to their enhanced visible light photocatalytic activities.
URI
http://hdl.handle.net/YU.REPOSITORY/32010http://dx.doi.org/10.1021/ie500986n
ISSN
0888-5885
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공과대학 > 화학공학부 > Articles
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