Cyclic voltammetric evidence of facilitation of the reduction of nitrite by the presence of molybdenum in Fe- or Cu-substituted heteropolytungstates

Keita, Bineta; Girard, François; Nadjo, Louis; Contant, Roland; Belghiche, Robila; Abbessi, Mostefa

doi:10.1016/s0022-0728(01)00516-2

Cited by 66 publications

(66 citation statements)

References 29 publications

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“…In summary, both in P 2 V 3 W 15 and As 2 V 2 IV VW 18 , two of their V-centers are featured by a two-electron composite wave, in contrast with the case of the di-vanadium substituted…”

Section: Electrocatalysis Of L-cysteine Oxidation By Multi-vanadium Smentioning

confidence: 89%

“…However, as stated in the preceding section, the present study focuses on the redox behaviours of Vcenters, which constitute the active element for the oxidation of L-cysteine. Figure 4A represents the CV associated, at pH 7, with the V 2 IV V centers within As 2 V 2 IV VW 18 . Worth of notice, the redox processes of the V-centers are located in a potential domain (roughly -0.400 V to + 0.600 V) well positive of that of W-centers (-0.800 V to -1.130 V).…”

Section: Electrocatalysis Of L-cysteine Oxidation By Multi-vanadium Smentioning

confidence: 99%

“…The most important difference concerns the redox behaviour of the two V IV centers of As 2 V 2 IV VW 18 . The two-electron composite wave that features this process shows that the two anticipated one-electron processes are very close from each other.…”

Section: Electrocatalysis Of L-cysteine Oxidation By Multi-vanadium Smentioning

confidence: 99%

“…and kept under a positive pressure of this gas during the experiments. The source, mounting and polishing of the glassy carbon (GC, Tokai, Japan) electrodes has been described [18]. The glassy carbon samples had a diameter of 3 mm.…”

Section: Introductionmentioning

confidence: 99%

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Multi-vanadium substituted polyoxometalates as efficient electrocatalysts for the oxidation of l-cysteine at low potential on glassy carbon electrodes

Keita

Contant

Mialane

et al. 2006

Electrochemistry Communications

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In search for efficient electrocatalysts for the oxidation of L-cysteine on glassy carbon, multivanadium-substituted polyoxometalates (POMs, for short) were tested. (P 2 V 3 W 15 ). Electrochemistry shows that the sandwich-type POM contains 2 V IV centers and one V V center and must be formulated As 2 V 2 IV VW 18 , in agreement with titration, elemental analysis and magnetic measurements on this element. The two-electron composite wave that features the redox behaviour of the two V IV centers of As 2 V 2 IV VW 18 are very close to each other and remains practically merged whatever the potential scan rate. In addition of this sharp contrast with the behaviours of the two V V centers of P 2 V 2 W 16 or P 2 MoV 2 W 15 , the very slow electron transfer kinetics associated with the second wave of P 2 V 3 W 15 appears also at variance with the case of As 2 V 2 IV VW 18 . All the POMs of this work proved efficient for the oxidation of L-cysteine. Comparison of the present results with those of mono-Vanadium substituted POMs indicates that accumulation of vanadium atoms in the POM framework is beneficial in the electrocatalytic process. In addition, the present work highlights the important influence of the POM structure in the electrocatalytic oxidation of L-cysteine. The remarkable outcome of this work is that the potential for the oxidation of L-cysteine in the presence of the selected POMs has been substantially driven in the negative direction compared to the case of glassy carbon alone, a feature which is associated with faster kinetics.The stability of the systems must also be pointed out.

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“…In summary, both in P 2 V 3 W 15 and As 2 V 2 IV VW 18 , two of their V-centers are featured by a two-electron composite wave, in contrast with the case of the di-vanadium substituted…”

Section: Electrocatalysis Of L-cysteine Oxidation By Multi-vanadium Smentioning

confidence: 89%

Section: Electrocatalysis Of L-cysteine Oxidation By Multi-vanadium Smentioning

confidence: 99%

Section: Electrocatalysis Of L-cysteine Oxidation By Multi-vanadium Smentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Multi-vanadium substituted polyoxometalates as efficient electrocatalysts for the oxidation of l-cysteine at low potential on glassy carbon electrodes

Keita

Contant

Mialane

et al. 2006

Electrochemistry Communications

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“…47 Unless indicated otherwise, scan rates were 10 mVs -1 , and all experiments were carried out at ambient temperature under an atmosphere of Ar. Electrochemical reduction was achieved using Bulk Electrolysis in a BASi Bulk Electrolysis cell.…”

Section: Fes For Reduction Of Tco 4 -And Binding Of the Reduced Tc Tomentioning

confidence: 99%

Photoreduction of⁹⁹Tc Pertechnetate by Nanometer-Sized Metal Oxides: New Strategies for Formation and Sequestration of Low-Valent Technetium

et al. 2011

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ABSTRACTproduct. The reduction and incorporation of TcO 4 -was accomplished in a "one pot" reaction using both sunlight and UV irradiation, and monitored as a function of time using multinuclear NMR and radio TLC. The process was further probed by the "step-wise" generation of reduced α 2 -P 2 W 17 O 61 12-through bulk electrolysis followed by the addition of TcO 4 -. serving as models for metal oxides, POMs may also provide a suitable platform to study the molecular level dynamics and mechanisms of the reduction and incorporation of Tc into a material.

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Synthesis and Characterization of Fe- or Cu-Substituted Molybdenum-Enriched Tungstodiphosphates

Belghiche

Contant

et al. 2002

Eur. J. Inorg. Chem.

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Keywords: Heteropolyanions / Dawson-type structures / Molybdenum / Transition metal cations / Electrocatalysis Stereospecific routes were followed to synthesize five new Fe 3+ and Cu 2+ -substituted Mo-enriched Dawson-type heteropolyanions as aqueous soluble potassium salts: α 2 -K 7 [Fe(OH 2 )P 2 W 12 Mo 5 O 61 ] and α 2 -K 7 [Fe(OH 2 )P 2 W 13 Mo 4 O 61 ], α 1 -and α 2 -K 8 [Cu(OH 2 )P 2 W 12 Mo 5 O 61 ] and α 2 -K 8 [Cu(OH 2 )-P 2 W 13 Mo 4 O 61 ]. The substituted species as well as their immediate lacunary precursors were characterized by IR, UV/

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Cyclic voltammetric evidence of facilitation of the reduction of nitrite by the presence of molybdenum in Fe- or Cu-substituted heteropolytungstates

Cited by 66 publications

References 29 publications

Multi-vanadium substituted polyoxometalates as efficient electrocatalysts for the oxidation of l-cysteine at low potential on glassy carbon electrodes

Multi-vanadium substituted polyoxometalates as efficient electrocatalysts for the oxidation of l-cysteine at low potential on glassy carbon electrodes

Photoreduction of⁹⁹Tc Pertechnetate by Nanometer-Sized Metal Oxides: New Strategies for Formation and Sequestration of Low-Valent Technetium

Synthesis and Characterization of Fe- or Cu-Substituted Molybdenum-Enriched Tungstodiphosphates

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Cyclic voltammetric evidence of facilitation of the reduction of nitrite by the presence of molybdenum in Fe- or Cu-substituted heteropolytungstates

Cited by 66 publications

References 29 publications

Multi-vanadium substituted polyoxometalates as efficient electrocatalysts for the oxidation of l-cysteine at low potential on glassy carbon electrodes

Multi-vanadium substituted polyoxometalates as efficient electrocatalysts for the oxidation of l-cysteine at low potential on glassy carbon electrodes

Photoreduction of99Tc Pertechnetate by Nanometer-Sized Metal Oxides: New Strategies for Formation and Sequestration of Low-Valent Technetium

Synthesis and Characterization of Fe- or Cu-Substituted Molybdenum-Enriched Tungstodiphosphates

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Photoreduction of⁹⁹Tc Pertechnetate by Nanometer-Sized Metal Oxides: New Strategies for Formation and Sequestration of Low-Valent Technetium