The influence of the conditions of the anodic formation and the thickness of Ag(I) oxide nanofilm on its semiconductor properties

Vvedenskii, A. V.; Grushevskaya, S. N.; Kudryashov, D. A.; Ganzha, S. V.

doi:10.1007/s10008-009-0952-9

Cited by 7 publications

(4 citation statements)

References 26 publications

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“…Electrochemical measurements in suspensions yielded flat band potentials of −0.4 V and +0.3 V vs. NHE for TiO 2 and Ag 2 O, respectively. The value measured here for the flat band potential of Ag 2 O is also in reasonably good agreement with published values [42,43].…”

Section: Photocatalytic Performance Of the Materialssupporting

confidence: 91%

Ag/Ag2O as a Co-Catalyst in TiO2 Photocatalysis: Effect of the Co-Catalyst/Photocatalyst Mass Ratio

et al. 2018

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Mixtures and composites of Ag/Ag2O and TiO2 (P25) with varying mass ratios of Ag/Ag2O were prepared, employing two methods. Mechanical mixtures (TM) were obtained by the sonication of a suspension containing TiO2 and Ag/Ag2O. Composites (TC) were prepared by a precipitation method employing TiO2 and AgNO3. Powder X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) confirmed the presence of Ag(0) and Ag2O. The activity of the materials was determined employing methylene blue (MB) as the probe compound. Bleaching of MB was observed in the presence of all materials. The bleaching rate was found to increase with increasing amounts of TiO2 under UV/vis light. In contrast, the MB bleaching rate decreased with increasing TiO2 content upon visible light illumination. XRD and XPS data indicate that Ag2O acts as an electron acceptor in the light-induced reaction of MB and is transformed by reduction of Ag+, yielding Ag(0). As a second light-induced reaction, the evolution of molecular hydrogen from aqueous methanol was investigated. Significant H2 evolution rates were only determined in the presence of materials containing more than 50 mass% of TiO2. The experimental results suggest that Ag/Ag2O is not stable under the experimental conditions. Therefore, to address Ag/Ag2O as a (photo)catalytically active material does not seem appropriate.

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Section: Photocatalytic Performance Of the Materialssupporting

confidence: 91%

Ag/Ag2O as a Co-Catalyst in TiO2 Photocatalysis: Effect of the Co-Catalyst/Photocatalyst Mass Ratio

et al. 2018

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“…It should also be noted that Ag 2 O does not generate appreciable photocurrent at a bias of 0.2 V unless a high potential is applied under light excitation to produce AgO. , For the dark current, it is well-known that silver particles are readily oxidized during anodic polarization. As shown in Figure , there are two main current peaks generally observed in the dark scanning voltammetry curve of Ag.…”

Section: Resultsmentioning

confidence: 99%

Visible Light Driven Photoelectrochemical Properties of Ti@TiO₂ Nanowire Electrodes Sensitized with Core–Shell Ag@Ag₂S Nanoparticles

et al. 2014

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We present a model electrode system comprised of nanostructured Ti electrode sensitized with Ag@Ag2S core-shell nanoparticles (NPs) for visible light driven photoelectrochemistry studies. The nanostructured Ti electrode is coated with Ti@TiO2 nanowires (NW) to provide a high surface area for improved light absorption and efficient charge collection from the Ag@Ag2S NPs. Pronounced photoelectrochemical responses of Ag@Ag2S NPs under visible light were obtained and attributed to collective contributions of visible light sensitivity of Ag2S, the local field enhancement of Ag surface plasmon, enhanced charge collection by Ti@TiO2 NWs, and the high surface area of the nanostructured electrode system. The shell thickness and core size of the Ag@Ag2S core-shell structure can be controlled to achieve optimal photoelectrochemical performance. XPS, XRD, SEM, high resolution TEM, AC impedance, and other electrochemical methods are applied to resolve the structure-function relationship of the nanostructured Ag@Ag2S NP electrode.

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“…1 mC cm −2 , the dissolution contributes to the overall oxidation current by no more than 3% at 355-365 mV vs. Hg|HgO. For q ox lower than 1 mC cm −2 , this contribution was not quantified, but it is expected that at early stages of the oxidation process, when the surface is not completely passivated or the oxide layer is very thin, the dissolution plays a more important role [44]. Figure 2 shows examples of XPS spectra for Ag subjected to oxidation in 0.1 M KOH at 420 mVand recorded at various stages of the Ar + sputtering.…”

Section: Resultsmentioning

confidence: 99%

“…semiconducting properties of the electrochemically formed Ag 2 O [1,21,[41][42][43][44] although a p-type semiconductivity is also reported [21,45,46].…”

Section: Introductionmentioning

confidence: 99%

Impedance study on the capacitance of silver electrode oxidised in alkaline electrolyte

Grdeń

2017

J Solid State Electrochem

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Electrochemical properties of oxide-covered polycrystalline Ag electrodes were studied in a 0.1 M KOH aqueous electrolyte. The oxide layers formed by a constant potential oxidation at 420 mV vs. Hg|HgO are composed of oxygen-deficient Ag 2 O as follows from the XPS and Auger experiments. Steady-state conditions required for collection of valid impedance spectra were obtained at a potential range of 345-365 mV. The components of the equivalent circuit used for the impedance spectra analysis are analysed as a function of the Ag 2 O layer thickness. The value of the coefficient of the constant phase element (CPE) attributed to the oxide layer is Ag 2 O thickness dependent. On the other hand, the components of the CPE describing the double-layer capacitance of the oxide-covered Ag electrode are independent on the oxide thickness and their values are comparable to those obtained for the oxide-free metal. This indicates that the double-layer capacitances of oxide-covered and oxide-free Ag electrodes are similar.

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The influence of the conditions of the anodic formation and the thickness of Ag(I) oxide nanofilm on its semiconductor properties

Cited by 7 publications

References 26 publications

Ag/Ag2O as a Co-Catalyst in TiO2 Photocatalysis: Effect of the Co-Catalyst/Photocatalyst Mass Ratio

Ag/Ag2O as a Co-Catalyst in TiO2 Photocatalysis: Effect of the Co-Catalyst/Photocatalyst Mass Ratio

Visible Light Driven Photoelectrochemical Properties of Ti@TiO₂ Nanowire Electrodes Sensitized with Core–Shell Ag@Ag₂S Nanoparticles

Impedance study on the capacitance of silver electrode oxidised in alkaline electrolyte

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The influence of the conditions of the anodic formation and the thickness of Ag(I) oxide nanofilm on its semiconductor properties

Cited by 7 publications

References 26 publications

Ag/Ag2O as a Co-Catalyst in TiO2 Photocatalysis: Effect of the Co-Catalyst/Photocatalyst Mass Ratio

Ag/Ag2O as a Co-Catalyst in TiO2 Photocatalysis: Effect of the Co-Catalyst/Photocatalyst Mass Ratio

Visible Light Driven Photoelectrochemical Properties of Ti@TiO2 Nanowire Electrodes Sensitized with Core–Shell Ag@Ag2S Nanoparticles

Impedance study on the capacitance of silver electrode oxidised in alkaline electrolyte

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Product

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Visible Light Driven Photoelectrochemical Properties of Ti@TiO₂ Nanowire Electrodes Sensitized with Core–Shell Ag@Ag₂S Nanoparticles