Band gap engineered TiO2 nanoparticles for visible light induced photoelectrochemical and photocatalytic studies

Title
Band gap engineered TiO2 nanoparticles for visible light induced photoelectrochemical and photocatalytic studies
Author(s)
조무환한도흥이진태칸모하마드만숩모드안사리사지드안자리데바브라타프라단[데바브라타프라단]
Keywords
ENERGY ELECTRON-BEAM; ELECTROCHEMICALLY ACTIVE BIOFILM; TITANIUM-DIOXIDE; OXYGEN VACANCIES; BLACK TIO2; PERFORMANCE ENHANCEMENT; ZNO PHOTOCATALYST; NANOCRYSTALS; WATER; FILMS
Issue Date
201401
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v.2, no.3, pp.637 - 644
Abstract
Visible light-active TiO2 (m-TiO2) nanoparticles were obtained by an electron beam treatment of commercial TiO2 (p-TiO2) nanoparticles. The m-TiO2 nanoparticles exhibited a distinct red-shift in the UV-visible absorption spectrum and a much narrower band gap (2.85 eV) due to defects as confirmed by diffuse reflectance spectroscopy (DRS), photoluminescence (PL), X-ray diffraction, Raman spectroscopy, electron paramagnetic resonance, transmission electron microscopy, X-ray photoelectron spectroscopy (XPS), electrochemical impedance spectroscopy (EIS) and linear scan voltammetry (LSV). The XPS revealed changes in the surface states, composition, Ti4+ to Ti3+ ratio, and oxygen deficiencies in the mTiO(2). The valence band XPS, DRS and PL results were carefully examined to understand the band gap reduction of m-TiO2. The visible light-responsive enhanced photocatalytic activity of m-TiO2 was demonstrated by degrading methylene blue and brilliant blue G. The EIS and LSV in the dark and under visible light irradiation further support the visible light-induced photocatalytic activities of the m-TiO2 due to a decrease in electron transfer resistance and an increase in photocurrent. This study confirms that m-TiO2 can be used effectively as a photocatalyst and photoelectrode material owing to its enhanced visible light-induced photocatalytic activity.
URI
http://hdl.handle.net/YU.REPOSITORY/33581http://dx.doi.org/10.1039/c3ta14052k
ISSN
2050-7488
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공과대학 > 화학공학부 > Articles
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