Morphology control of cathodically deposited TiO2 films

Huang, Ching-Chun; Hsu, Huan-Ching; Hu, Chi‐Chang; Chang, Kuo‐Hsin; Lee, Ying-Feng

doi:10.1016/j.electacta.2010.07.007

Cited by 21 publications

(27 citation statements)

References 28 publications

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“…−1.6 V on curve 1, which was much more negative than the onset potential of NO 3 − reduction obtained in the threeelectrode system. 19,20 This phenomenon is reasonable because of the electrochemical polarization on both anode and cathode. Second, the onset potential of NO 3 − reduction was slightly shifted positively to ca.…”

Section: Resultsmentioning

confidence: 95%

“…−1.5 V on curves 2 and 3, indicating that the freshly deposited oxyhydroxyl titanium species are an electrocatalyst for NO 3 − reduction. 19 Third, on curve 1, the sharp increase in the cathodic current at potentials negative to −2.4 V is attributed to hydrogen evolution on the Ti substrate which has not been completely coated with a layer of oxy-hydroxyl titanium species. On the other hand, this reaction has been significantly depressed to occur at potentials more negative than −3.05 V on curves 2 and 3.…”

Section: Resultsmentioning

confidence: 98%

“…[18][19][20] Among the above mentioned methods, anodizing and electrodeposition are the most common methods for fabricating TiO 2 photo-anodes for the photo-electrochemical processes (e.g., photo-electro-Fenton (PEF) and photo-electro-catalysis (PEC) reactions). Moreover, electrodeposition is preferred because this process generally provides the advantages such as uniform deposition on substrates of complex shapes and cost effective meanwhile the thickness can also be controlled by varying the charge density.…”

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confidence: 99%

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Electrochemical Photocatalytic Degradation of Orange G Using TiO₂Films Prepared by Cathodic Deposition

Lin

Hsiao

et al. 2014

J. Electrochem. Soc.

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Herein, we report that organic dyes with poor adsorption on photocatalysts (e.g., OG (orange G) on TiO 2 ) can only be significantly degraded via the indirect oxidation process by the electrochemical photocatalytic (EPC) or photo-electro-Fenton (PEF) mechanisms because of their enhanced electron-hole separation for generating H 2 O 2 . The TiO 2 /Ti photo-anodes were prepared by cathodic deposition from a bath containing TiCl 3 , HCl, H 2 O 2 , and NaNO 3 under a two-electrode mode for EPC dye degradation. Effects of the deposition cell voltage, deposition time, and annealing temperature on the photocatalytic activity of TiO 2 films, evaluated by the photocurrent density, are systematically investigated. The surface morphologies and crystalline structure of various TiO 2 films were studied using scanning electron microscopic (SEM) and X-ray diffraction (XRD) analyses. The EPC characteristics of TiO 2 /Ti photo-anodes combined with a graphite cathode toward the OG degradation have also been evaluated. The maximal photocatalytic activity is obtained for the TiO 2 /Ti photo-anode deposited at a cell voltage of 2.6 V for 20 min and annealed at 700 • C in air for 1 hr, which exhibits a photocurrent density of 22.86 μA mg −1 . The order of degradation modes with respect to decreasing the degradation efficiency of OG is: PEF > EPC > PC (photocatalytic) > EC (electrocatalytic) oxidation.In recent years, TiO 2 in various forms (e.g., anatase, rutile, and brookite phases) has been widely recognized as the most popular photocatalyst for photo-electrodes, due to its high photocatalytic activity and chemical stability under ultraviolet light excitation for water and air purifications, 1-3 photocatalysts, 4 gas sensors, 5 electrochromic devices, 6 etc. When TiO 2 was employed as a photo-anode for organic chemicals degradation, its electro-photocatalytic activity, significantly affected by the electron transport rate meanwhile characteristics of recalcitrant organic pollutants mainly depend on the microstructures (e.g., crystalline structure, crystal size, film thickness, etc.) of TiO 2 , substrate, applied potential bias, solution pH, and electrolyte conductivity. 7,8 Fortunately, the microstructure of TiO 2 films can be controlled by varying the preparation methods and parameters.Titanium dioxide films can be prepared by sol-gel method, 9,10 direct oxidation of metallic titanium, 11 chemical vapor deposition (CVD), 12 hydrothermal synthesis, 13 electrospinning, 14 magnetron sputtering, 15,16 anodizing, 17 and electrodeposition. 18-20 Among the above mentioned methods, anodizing and electrodeposition are the most common methods for fabricating TiO 2 photo-anodes for the photo-electrochemical processes (e.g., photo-electro-Fenton (PEF) and photo-electro-catalysis (PEC) reactions). Moreover, electrodeposition is preferred because this process generally provides the advantages such as uniform deposition on substrates of complex shapes and cost effective meanwhile the thickness can also be controlled by varying the charge density....

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 98%

mentioning

confidence: 99%

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Electrochemical Photocatalytic Degradation of Orange G Using TiO₂Films Prepared by Cathodic Deposition

Lin

Hsiao

et al. 2014

J. Electrochem. Soc.

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“…Hence, reduction of NO 3 À is not significantly affected by the metallic precursors and significantly occurs at potentials negative to À0.63 V, leading to the deposition of hydroxides. The precipitation of hydroxides at potentials between À0.63 and 0.9 V is believed to result in the different ieE responses at potentials negative to À0.9 V because different hydroxides and/or oxides might show different catalytic activities for the NO 3 À reduction [13] or hydrogen evolution [14]. Since metallic Ni and Co may be codeposited with their hydroxides in the very negative potential region (e.g., negative than À0.9 V), the current density for depositing Co(OH) 2 and Ni(OH) 2 from the above two baths is fixed at 1 mA cm À2 to avoid the possible deposition of metallic Ni or Co in the hydroxide films.…”

Section: Reduction Of Nomentioning

confidence: 98%

“…15 nm. Moreover, there are several tiny pores randomly distributed on these thin Co(OH) 2 platelets, probably due to N 2 bubbling [13]. In Fig.…”

Section: Reduction Of Nomentioning

confidence: 98%

Cathodic deposition of Ni(OH)2 and Co(OH)2 for asymmetric supercapacitors: Importance of the electrochemical reversibility of redox couples

Chen

Chang

2013

Journal of Power Sources

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205

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Design of Electrochemically Modified fMWCNT‐pencil Graphite Electrode Decorated with Cu and Ag Nanofilm and its Electrocatalytic Behavior Towards Imazethapyr

2017

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Herein, a facile procedure was developed for designing an electrochemical sensor based on pencil graphite electrode modified with electrochemically synthesized silver and copper nanoparticles (AgNP and CuNP) supported on functionalized multiwalled carbon nanotubes (fMWCNTs). The electrochemical and morphological characterization was carried out by cyclic voltammetry, Electrochemical Impedance Spectroscopy, Powder X‐ray diffraction, Field Emission Scanning Electron Microscopy, Transmission electron microscopy and Atomic Force Microscopy. The designed sensor exhibited electrocatalytic behavior towards the reduction of Imazethapyr. Results indicates the combination of AgNPs, CuNPs and fMWCNTs on PGE produced remarkable enhancement in electrocatalytic and sensing properties. Various electro‐kinetic parameters like Rct, kapp, n, α, E0, k0, Γ, D and k have been evaluated by CV, impedance and Chronoamperometric studies. The electrochemical performance was improved by optimizing the effect of pH, scan rate, amount of fMWCNTs and deposition parameters of AgNP and CuNP. The sensor was efficaciously applied for determination of Imazethapyr and exhibited a linear correlation in the concentration range of 0.01–5.0 μg mL−1 with low detection limits, 0.159 ng mL−1 using AdSWV. The fabricated sensor exhibited good accuracy, acceptable stability and high efficacy for quantitative determination of Imazethapyr in real samples with notable recoveries ranging from 98 % to 100.2 %.

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Morphology control of cathodically deposited TiO2 films

Cited by 21 publications

References 28 publications

Electrochemical Photocatalytic Degradation of Orange G Using TiO₂Films Prepared by Cathodic Deposition

Electrochemical Photocatalytic Degradation of Orange G Using TiO₂Films Prepared by Cathodic Deposition

Cathodic deposition of Ni(OH)2 and Co(OH)2 for asymmetric supercapacitors: Importance of the electrochemical reversibility of redox couples

Design of Electrochemically Modified fMWCNT‐pencil Graphite Electrode Decorated with Cu and Ag Nanofilm and its Electrocatalytic Behavior Towards Imazethapyr

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Morphology control of cathodically deposited TiO2 films

Cited by 21 publications

References 28 publications

Electrochemical Photocatalytic Degradation of Orange G Using TiO2Films Prepared by Cathodic Deposition

Electrochemical Photocatalytic Degradation of Orange G Using TiO2Films Prepared by Cathodic Deposition

Cathodic deposition of Ni(OH)2 and Co(OH)2 for asymmetric supercapacitors: Importance of the electrochemical reversibility of redox couples

Design of Electrochemically Modified fMWCNT‐pencil Graphite Electrode Decorated with Cu and Ag Nanofilm and its Electrocatalytic Behavior Towards Imazethapyr

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Electrochemical Photocatalytic Degradation of Orange G Using TiO₂Films Prepared by Cathodic Deposition

Electrochemical Photocatalytic Degradation of Orange G Using TiO₂Films Prepared by Cathodic Deposition