Electrochemical Preparation and Characterization of Surface-Fluorinated TiO2 Nanoporous Film and Its Enhanced Photoelectrochemical and Photocatalytic Properties
Abstract:In recent years, surface fluorination of TiO 2 has been demonstrated to be an efficient method for improving its photocatalytic (PC) reactivity toward some pollutants. In this paper, a new and simple method for surface fluorination and porosity-creating of TiO 2 is presented. The sample was prepared by anodization of TiO 2 in HF aqueous solutions formed by direct thermal oxidization of titanium sheet. The preparation conditions were optimized. The prepared samples were characterized by scanning electron micros… Show more
“…Since the diameters of the semicircles are equal to the charge-transfer resistance of a sample, semicircles in Nyquist plots reveal the information on the charge transfer process. Based on previous studies, the smaller size of the semicircle arc diameter implies a more effective separation of the photogenerated e-h pairs and/or a faster interfacial charge transfer to the electron donor-acceptor[44]. As depicted inFigure 6d, the TiO 2-x -500 exhibits the smallest semicircular diameter compared to other TiO 2-x samples both in the dark and under visible-light illumination, illustrating enhanced electronic conductivity in TiO 2-x -500 nanoparticles.…”
“…Since the diameters of the semicircles are equal to the charge-transfer resistance of a sample, semicircles in Nyquist plots reveal the information on the charge transfer process. Based on previous studies, the smaller size of the semicircle arc diameter implies a more effective separation of the photogenerated e-h pairs and/or a faster interfacial charge transfer to the electron donor-acceptor[44]. As depicted inFigure 6d, the TiO 2-x -500 exhibits the smallest semicircular diameter compared to other TiO 2-x samples both in the dark and under visible-light illumination, illustrating enhanced electronic conductivity in TiO 2-x -500 nanoparticles.…”
“…The excited electron life was further studied by PL spectra. PL spectra have been widely used to study surface structure and excited states and to follow a surface process involving electron/hole lifetime [50][51][52][53]. With electronhole pairs recombination after a photocatalyst is irradiated (i.e., laser), photons are emitted, resulting in photoluminescence.…”
Section: Photoelectrochemical Behavior Of Cds/pt-tio 2 Ntsmentioning
“…Although the high charge transfer resistance values for both photo-electrodes due to the absence of an electron-donor molecule in the solution, the charge-transfer resistance value for the LiTCNE/TiO 2 /ITO photoelectrochemical sensor under LED light was 10-fold lower than that to TiO 2 /ITO photoelectrode. The lower charge transfer resistance to LiTCNE-sensitized TiO 2 suggests a more effective separation of photogenerated electron-hole pair or a faster interfacial charge transfer to the electron donor/acceptor with the composite LiTCNE/TiO 2 material [35,36]. Fig.…”
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