Photoelectrolytic oxidation of organic species at mesoporous tungsten trioxide film electrodes under visible light illumination

Solarska, Renata; Santato, Clara; Jorand-Sartoretti, C.; Ulmann, M.; Augustyński, Jan

doi:10.1007/s10800-005-1400-x

Cited by 70 publications

(55 citation statements)

References 19 publications

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“…Questions regarding the electron transport through the porous structure [21] and the photooxidation of water [21,22] or methanol and other small organic molecules have been addressed. [18,22,23] It is remarkable that in all cases a very high conversion efficiency was found. Recently, the oxidation of 2-naphthol on sol-gel WO 3 nanostructured thin-film electrodes was studied, [24] a high photoelectrocatalytic activity again being reported.…”

Section: Introductionmentioning

confidence: 85%

Photoelectrochemical Behavior of Nanostructured WO₃ Thin‐Film Electrodes: The Oxidation of Formic Acid

et al. 2006

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Nanostructured tungsten trioxide thin-film electrodes are prepared on conducting glass substrates by either potentiostatic electrodeposition from aqueous solutions of peroxotungstic acid or direct deposition of WO3 slurries. Once treated thermally in air at 450 degrees C, the electrodes are found to be composed of monoclinic WO3 grains with a particle size around 30-40 nm. The photoelectrochemical behavior of these electrodes in 1 M HClO4 apparently reveals a low degree of electron-hole recombination. Upon addition of formic acid, the electrode showed the current multiplication phenomenon together with a shift of the photocurrent onset potential toward less positive values. Photoelectrochemical experiments devised on the basis of a kinetic model reported recently [I. Mora-Seró, T. Lana-Villarreal, J. Bisquert, A. Pitarch, R. Gómez, P. Salvador, J. Phys. Chem. B 2005, 109, 3371] showed that an interfacial mechanism of inelastic, direct hole transfer takes place in the photooxidation of formic acid. This behavior is attributed to the tendency of formic acid molecules to be specifically adsorbed on the WO3 nanoparticles, as evidenced by attenuated total reflection infrared spectroscopy.

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Section: Introductionmentioning

confidence: 85%

Photoelectrochemical Behavior of Nanostructured WO₃ Thin‐Film Electrodes: The Oxidation of Formic Acid

et al. 2006

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“…Our recent studies also showed that an increase of the current intensities was also seen when the ink suspension was prepared using CNTs that had already been modified with PDDA and [P 2 W 17 VO 62 ] 8− . It is reasonable to expect that current increases were caused by so-called current doubling historically observed in the presence of different organic molecules [58,59]. As the observed effect led to the pseudocapacitance increase, the ink suspension was prepared as a rule with addition of diethyl ether.…”

Section: Resultsmentioning

confidence: 99%

Hybrid materials utilizing polyelectrolyte-derivatized carbon nanotubes and vanadium-mixed addenda heteropolytungstate for efficient electrochemical charging and electrocatalysis

Sosnowska

Góral-Kurbiel

Skunik-Nuckowska

et al. 2013

J Solid State Electrochem

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Preparation and electrochemical behavior of new hybrid materials composed of multi-walled carbon nanotubes (CNTs) that were derivatized with poly(diallyldimethylammonium) chloride and modified with vanadium-mixed addenda Dawson-type heteropolytungstate, [P 2 W 17 VO 62 ] 8− , is described here. These nanostructured composite systems exhibited fast dynamics of charge propagation. They were characterized by the transport (effectively diffusional) kinetic parameter of approximately 8×10 −8 cm −2 s −1/2 and the specific capacitance parameter of 82 F g −1 (at the charging/discharging current of 200 mA g −1 ). The latter parameter for bare CNTs was found to be only 50 F g −1 under analogous conditions. These observations were based on the results of galvanostatic charging-discharging, cyclic voltammetric, and AC impedance spectroscopic measurements. The improved capacitance properties were attributed to the systems' pseudocapacitive features originating from the fast redox transitions of the [P 2 W 17 VO 62 ] 8− polyanions. In addition to the fast redox conduction, the proposed organicinorganic hybrid materials exhibited interesting electrocatalytic activity toward reduction of bromate in the broad concentration range (sensitivity, 0.24 mA cm −2 mmol −1 dm 3 ).

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“…The production of S2O8 2− at pH 2 is approximately six times that at pH 3. Prior to the peroxydisulfate (S2O8 2− ), the photogenerated SO4 − • can initially be formed as intermediates in the WO3 photoanode [42,48]. Subsequently, the generated SO4 − • can directly react with MO in Na2SO4 solution and revert to SO4 2− (Equations (8) and (9)).…”

Section: The Pec Degradation Mechanism Of Momentioning

confidence: 99%

Efficient Degradation of Refractory Organics Using Sulfate Radicals Generated Directly from WO3 Photoelectrode and the Catalytic Reaction of Sulfate

Zheng

Bai

et al. 2017

Catalysts

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An environment-friendly method of efficiently degrading refractory organics using SO 4 − • generated directly from a WO 3 photoelectrode and a catalytic reaction of sulfate was proposed, in which the cycling process of SO 4 2− → SO 4 − • → SO 4 2− was achieved in the treatment of organic pollutants without any other activator and without the continuous addition of sulfate. The results show that the removal efficiency for a typical refractory organics of methyl orange (MO) with 5 mg/L was up to 95% within 80 min, and merely 3% by photolysis and 19% by photocatalysis, respectively, under similar conditions. The rate constant for the disposal of MO at pH 2, in which SO 4 − • instead of HO• is the main oxidizer confirmed by radical scavenger experiment, is up to 5.21 × 10 −4 s −1 , which was~6.6 times that (7.89 × 10 −5 s −1 ) under neutral condition, in which HO• is the main oxidizer. The concentration of active persulfate (S 2 O 8 2− , SO 5 2− , and SO 4 − •) species at pH 2 was up to 0.38 mM, which was~16-fold as much as that (0.023 mM) in neutral conditions. The method provides a new approach for the treatment and resource utilization of sulfate wastewater.

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Photoelectrolytic oxidation of organic species at mesoporous tungsten trioxide film electrodes under visible light illumination

Cited by 70 publications

References 19 publications

Photoelectrochemical Behavior of Nanostructured WO₃ Thin‐Film Electrodes: The Oxidation of Formic Acid

Photoelectrochemical Behavior of Nanostructured WO₃ Thin‐Film Electrodes: The Oxidation of Formic Acid

Hybrid materials utilizing polyelectrolyte-derivatized carbon nanotubes and vanadium-mixed addenda heteropolytungstate for efficient electrochemical charging and electrocatalysis

Efficient Degradation of Refractory Organics Using Sulfate Radicals Generated Directly from WO3 Photoelectrode and the Catalytic Reaction of Sulfate

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Photoelectrolytic oxidation of organic species at mesoporous tungsten trioxide film electrodes under visible light illumination

Cited by 70 publications

References 19 publications

Photoelectrochemical Behavior of Nanostructured WO3 Thin‐Film Electrodes: The Oxidation of Formic Acid

Photoelectrochemical Behavior of Nanostructured WO3 Thin‐Film Electrodes: The Oxidation of Formic Acid

Hybrid materials utilizing polyelectrolyte-derivatized carbon nanotubes and vanadium-mixed addenda heteropolytungstate for efficient electrochemical charging and electrocatalysis

Efficient Degradation of Refractory Organics Using Sulfate Radicals Generated Directly from WO3 Photoelectrode and the Catalytic Reaction of Sulfate

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Photoelectrochemical Behavior of Nanostructured WO₃ Thin‐Film Electrodes: The Oxidation of Formic Acid

Photoelectrochemical Behavior of Nanostructured WO₃ Thin‐Film Electrodes: The Oxidation of Formic Acid