Evidence by Electrochemical Impedance Spectroscopy of Surface States Mediated SiMo12O404− Reduction at an n-InP Electrode

Debiemme‐Chouvy, Catherine; Cachet, H.

doi:10.1021/jp804899h

Cited by 8 publications

(2 citation statements)

References 23 publications

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“…A similar phenomenon was also observed on SiMo 12 O 40 adsorbed on the surface of an InP electrode. 46 The carrier concentration can be calculated by the slope of the Mott-Schottky curves. If the slope in a Mott-Schottky plot is lower, the carrier concentration is higher.…”

Section: The Effect Of Doping At Different Sites On the Photoelectroc...mentioning

confidence: 99%

Formation energy and photoelectrochemical properties of BiVO₄after doping at Bi³⁺or V⁵⁺sites with higher valence metal ions

Luo

Wang

Zhao

et al. 2013

Phys. Chem. Chem. Phys.

145

108

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Photoelectrochemical water splitting is an attractive method to produce H(2) fuel from solar energy and water. Ion doping with higher valence states was used widely to enhance the photocurrent of an n-type oxide semiconductor. In this study, the different doping sites and the photoelectrochemical properties of Mo(6+), W(6+) and Sn(4+)-doped BiVO(4) were studied systematically. The results suggested that Mo(6+) or W(6+)-doped BiVO(4) had a much higher photocurrent while the photocurrent of Sn(4+)-doped BiVO(4) did not change obviously. Raman and XPS were used to identify the doping sites in the BiVO(4) crystal lattice. It was found that Mo or W substituted V sites but Sn did not substitute Bi sites. Results of theoretical calculation indicated that a higher formation energy and lower solubility of impurity ions led to serious SnO(2) segregation on the surface of the Sn(4+)-doped BiVO(4) thin film, which was the main reason for the poor performance of Sn-doped BiVO(4). The higher formation energy of Sn(4+) came from the large mismatch of ion radius and different outer shell electron distribution. These results can offer guidance in choosing suitable doping ions for other semiconductor photoelectrodes.

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Section: The Effect Of Doping At Different Sites On the Photoelectroc...mentioning

confidence: 99%

Formation energy and photoelectrochemical properties of BiVO₄after doping at Bi³⁺or V⁵⁺sites with higher valence metal ions

Luo

Wang

Zhao

et al. 2013

Phys. Chem. Chem. Phys.

145

108

View full text Add to dashboard Cite

show abstract

“…Polyoxometalates (POMs) exhibit a great diversity of sizes, nuclearities, and shapes with diverse physical properties and applications, such as catalysis, 1-6 electrochemistry, 7,8 medicine, 9 and so on. [10][11][12] Especially, the interest in catalysis by POM-based coordination polymers has signicantly grown because the structures of the catalytically active sites can be designed at atomic and molecular levels.…”

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confidence: 99%

A nickel-modified polyoxometalate towards a highly efficient catalyst for selective oxidation of hydrocarbons

Zhou

Liu

et al. 2014

J. Mater. Chem. A

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Facile and Green Reduction of Graphene Oxide by a Reduced Polyoxometalate and Formation of a Nanohybrid

et al. 2016

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An ecofriendly chemical reduction of graphene oxide (GO) in water is reported. The reducing agent is an electrochemically reduced Keggin-type polyoxometalate (SiW 12 O 40 5À ). Moreover, this process leads to the fabrication of SiW 12 @rGO nanocomposite. This nanohybrid exhibits an electrochemical response which combines highf aradic and capacitive currents due to high coverage of polyoxometalates on the rGO sheets. Therefore this material has strong potentiality for energy storage.Graphene is the first two-dimensional atomic crystal available. Its singular structure is reflected by exceptionalp roperties like high mechanical strength and extremely high electrical and thermalc onductivities. The potentiala pplicationso fg raphene are multiple, ranging from electronics or flexible screens or catalysts to use in thermalm anagement. However,t he difficulties associated with its production are ac ritical drawback for largescale use. Several methods have been developedb ased on chemicala nd physical exfoliation of graphite:e lectrochemical exfoliation, [1] intercalation of elementi ng raphite compounds at elevated temperatures, [2] and liquid-phasee xfoliation using agents like N-methylpyrrolidone, iodine, chloride, or bromide. [3] Nevertheless, the most common methodf or large-scale productiono fg raphene is the moderate oxidation of graphite through the modified Hummers method, [4] followed by exfoliation of the resulting graphene oxide (GO) and its reduction to obtain graphene (reduced graphene oxide,r GO). [4][5][6] The last step involves common products like hydrazine hydrate or formaldehyde which are known to be hazardous to human health and the environment. To avoid these components, an alternative method based on the UV-assisted photoreduction of GO in the presence of polyoxometalates(POMs) and asacrificial organic reagent has been proposed. [7] POMs are ac lass of inorganic metal-oxygen cluster anions with redox properties. [8] These clusters (so-called isopoly-and heteropolyanions( HPAs)) contain highly symmetrical core assemblies of MO x units (M = V, Mo, W). They can have various structures containing for example 6, 12, or 18 metal atoms in ah igh oxidation state. For HPAs, the structure with 12 metal atoms is the Keggins tructure. In the method just mentioned the POMs act also as anionic stabilizers, preventing the aggregation of rGO and leadingt ot he formation of POM@rGO nanocomposites.H owever,o nly small amounts of rGO could be obtained under such conditions due to localized laser irradiation, and also an organic reagent has to be used. It hasa lso been shownt hat the hydrothermal reduction of GO in the presence of H 3 PMo 12 O 40 (PMo 12 )l eads to the nanocomposite PMo 12 @rGO. [9] Another route developed recently concerns the electrochemical reduction of GO assisted by POMs. [10] Herein we propose an environmentally friendly,t wo-step process for the preparation of reduced graphene oxide decorated with POMs (POM@rGO). In this process the first step is the electroreduction of SiW 12 O 40 4À (SiW 12 ...

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Evidence by Electrochemical Impedance Spectroscopy of Surface States Mediated SiMo₁₂O₄₀⁴⁻ Reduction at an n-InP Electrode

Cited by 8 publications

References 23 publications

Formation energy and photoelectrochemical properties of BiVO₄after doping at Bi³⁺or V⁵⁺sites with higher valence metal ions

Formation energy and photoelectrochemical properties of BiVO₄after doping at Bi³⁺or V⁵⁺sites with higher valence metal ions

A nickel-modified polyoxometalate towards a highly efficient catalyst for selective oxidation of hydrocarbons

Facile and Green Reduction of Graphene Oxide by a Reduced Polyoxometalate and Formation of a Nanohybrid

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Evidence by Electrochemical Impedance Spectroscopy of Surface States Mediated SiMo12O404− Reduction at an n-InP Electrode

Cited by 8 publications

References 23 publications

Formation energy and photoelectrochemical properties of BiVO4after doping at Bi3+or V5+sites with higher valence metal ions

Formation energy and photoelectrochemical properties of BiVO4after doping at Bi3+or V5+sites with higher valence metal ions

A nickel-modified polyoxometalate towards a highly efficient catalyst for selective oxidation of hydrocarbons

Facile and Green Reduction of Graphene Oxide by a Reduced Polyoxometalate and Formation of a Nanohybrid

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Evidence by Electrochemical Impedance Spectroscopy of Surface States Mediated SiMo₁₂O₄₀⁴⁻ Reduction at an n-InP Electrode

Formation energy and photoelectrochemical properties of BiVO₄after doping at Bi³⁺or V⁵⁺sites with higher valence metal ions

Formation energy and photoelectrochemical properties of BiVO₄after doping at Bi³⁺or V⁵⁺sites with higher valence metal ions