Photoelectrochemical and physical properties of WO3 films obtained by the polymeric precursor method

Li, Wenzhang; Li, Jie; Wang, Xuan; Ma, Jun; Chen, Qiyuan

doi:10.1016/j.ijhydene.2010.09.011

Cited by 95 publications

(59 citation statements)

References 43 publications

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“…10. As shown in the figure, the photo-electrode exhibits a very stable performance for a period of 4 h. Although a reduction was occurred from 3.0 to 1.97 mA cm 2 (34%) in photocurrent density at the first 30 s, a constant trend was observed for the next duration similarly to that of reported by Li et al [23].…”

Section: Performance Of the Photoelectrochemical Cellsupporting

confidence: 84%

Photocatalytic activity of WO3/Fe2O3 nanocomposite photoanode

Memar

Phan

Tade

2015

International Journal of Hydrogen Energy

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Section: Performance Of the Photoelectrochemical Cellsupporting

confidence: 84%

Photocatalytic activity of WO3/Fe2O3 nanocomposite photoanode

Memar

Phan

Tade

2015

International Journal of Hydrogen Energy

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“…The same photocurrent onsets of WO 3 electrodes were reported for measurements carried out in sulfuric acid electrolytes in the absence of methanol 10,15 and in different acidic electrolytes in the presence of methanol. 21,42 Moreover formaldehyde, the main product of the photooxidation process of methanol, was monitored by fluorescence spectroscopy with the help of the Nash reagent after measuring chopped light current-potential curves, as displayed in Fig. 12.…”

Section: Dalton Transactions Papermentioning

confidence: 99%

Cold sprayed WO₃and TiO₂electrodes for photoelectrochemical water and methanol oxidation in renewable energy applications

et al. 2017

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Films prepared by cold spray have potential applications as photoanodes in electrochemical water splitting and waste water purification. In the present study cold sprayed photoelectrodes produced with WO 3 (active under visible light illumination) and TiO 2 (active under UV illumination) on titanium metal substrates were investigated as photoanodes for the oxidation of water and methanol, respectively. Methanol was chosen as organic model pollutant in acidic electrolytes. Main advantages of the cold sprayed photoelectrodes are the improved metal-semiconductor junctions and the superior mechanical stability.Additionally, the cold spray method can be utilized as a large-scale electrode fabrication technique for photoelectrochemical applications. Incident photon to current efficiencies reveal that cold sprayed TiO 2 / WO 3 photoanodes exhibit the best photoelectrochemical properties with regard to the water and methanol oxidation reactions in comparison with the benchmark photocatalyst Aeroxide TiO 2 P25 due to more efficient harvesting of the total solar light irradiation related to their smaller band gap energies.

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“…Tungsten trioxide, WO 3 , an earth-abundant, oxidatively stable semiconductor, is one such material that could fulfill the role of photoanode. [14][15][16][17][18][19][20][21][22][23][24] In most deposition methods, the presence of oxygen vacancies serve as shallow electron donors and naturally dope the WO 3 n-type. 25 Its band gap of 2.6 eV is higher than ideal for the large band gap absorber in a tandem cell.…”

Section: Introductionmentioning

confidence: 99%

“…30,31 Even in acidic conditions, some photocorrosion of WO 3 has been observed due to the formation of peroxo-species as intermediates during water oxidation. [22][23][24]32 Although peroxide formation and the oxidation of most acid counterion species are reactions that are thermodynamically less feasible than water oxidation, the kinetics of these reactions are often more favorable than oxygen evolution. 14 The photogenerated minority-carrier holes in the valence band of WO 3 have a potential of B2.97 V vs. NHE at pH 0.…”

Section: Introductionmentioning

confidence: 99%

Improving O2 production of WO3 photoanodes with IrO2 in acidic aqueous electrolyte

Spurgeon

Velázquez

McDowell

2014

Phys. Chem. Chem. Phys.

101

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WO 3 is a promising candidate for a photoanode material in an acidic electrolyte, in which it is more stable than most metal oxides, but kinetic limitations combined with the large driving force available in the WO 3 valence band for water oxidation make competing reactions such as the oxidation of the acid counterion a more favorable reaction. The incorporation of an oxygen evolving catalyst (OEC) on the WO 3 surface can improve the kinetics for water oxidation and increase the branching ratio for O 2 production. Ir-based OECs were attached to WO 3 photoanodes by a variety of methods including sintering from metal salts, sputtering, drop-casting of particles, and electrodeposition to analyze how attachment strategies can affect photoelectrochemical oxygen production at WO 3 photoanodes in 1 M H 2 SO 4 . High surface coverage of catalyst on the semiconductor was necessary to ensure that most minority-carrier holes contributed to water oxidation through an active catalyst site rather than a sidereaction through the WO 3 /electrolyte interface. Sputtering of IrO 2 layers on WO 3 did not detrimentally affect the energy-conversion behavior of the photoanode and improved the O 2 yield at 1.2 V vs. RHE from B0% for bare WO 3 to 50-70% for a thin, optically transparent catalyst layer to nearly 100% for thick, opaque catalyst layers. Measurements with a fast one-electron redox couple indicated ohmic behavior at the IrO 2 /WO 3 junction, which provided a shunt pathway for electrocatalytic IrO 2 behavior with the WO 3 photoanode under reverse bias. Although other OECs were tested, only IrO 2 displayed extended stability under the anodic operating conditions in acid as determined by XPS.

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Photoelectrochemical and physical properties of WO3 films obtained by the polymeric precursor method

Cited by 95 publications

References 43 publications

Photocatalytic activity of WO3/Fe2O3 nanocomposite photoanode

Photocatalytic activity of WO3/Fe2O3 nanocomposite photoanode

Cold sprayed WO₃and TiO₂electrodes for photoelectrochemical water and methanol oxidation in renewable energy applications

Improving O2 production of WO3 photoanodes with IrO2 in acidic aqueous electrolyte

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Photoelectrochemical and physical properties of WO3 films obtained by the polymeric precursor method

Cited by 95 publications

References 43 publications

Photocatalytic activity of WO3/Fe2O3 nanocomposite photoanode

Photocatalytic activity of WO3/Fe2O3 nanocomposite photoanode

Cold sprayed WO3and TiO2electrodes for photoelectrochemical water and methanol oxidation in renewable energy applications

Improving O2 production of WO3 photoanodes with IrO2 in acidic aqueous electrolyte

Contact Info

Product

Resources

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Cold sprayed WO₃and TiO₂electrodes for photoelectrochemical water and methanol oxidation in renewable energy applications