Compared Behaviours of Dawson-Type Tungstodiarsenates and -diphosphates

Keita, Bineta; Mbomekallé, Israël Martyr; Nadjo, Louis; Contant, Roland

doi:10.1002/1099-0682(20022)2002:2<473::aid-ejic473>3.0.co;2-x

Cited by 40 publications

(63 citation statements)

References 27 publications

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“…Accumulation of vanadium atoms in the POM framework is beneficial as was also observed previously for several sandwich-type POMs in the electrocatalytic reduction of the NOx [23][24][25][26][27] or that of O 2 [28][29][30]. In addition, the present work highlights the important influence of the POM structure in the electrocatalytic oxidation of L-cysteine.…”

Section: Electrocatalysissupporting

confidence: 85%

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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Section: Electrocatalysissupporting

confidence: 85%

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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“…Nevertheless, in this case the reaction also leads to NH 3 as the main final product. Keita [22] found that Zn 2+ addition to the electrolyte had a positive effect on cathodic reduction of NO À 2 , which indicates that Zn is a suitable complementary metal to Cu for the cathode material in terms of the reaction kinetics. Cu catalyses the reduction of NO À 3 to NO À 2 and Zn the reduction of NO À 2 to the final product.…”

Section: Introductionmentioning

confidence: 99%

Electrocatalytic activity of copper alloys for $$\hbox{NO}_{3}^{-}$$ reduction in a weakly alkaline solution Part 1: Copper–zinc

Mácová

Bouzek

2005

J Appl Electrochem

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A comparative study of the influence of an addition of Zn to Cu as the basic cathode material on electrocatalytic activity for NO À 3 reduction was performed. Potentiodynamic measurements using a rotating ring-disk electrode were carried out in an artificial solution simulating solution after regeneration of the ion-exchange column for NO À 3 removal in drinking water treatment. The results were verified by batch electrolysis experiments. An enhancement of the electrocatalytic activity was observed. Unfortunately, NH 3 was found to be the main NO À 3 reduction product. The highest electrocatalytic activity was obtained using an electrode containing 41 wt.% Zn.

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“…Also, some chemically modified electrodes with different active mediators immobilized at the electrode surface have been used for the catalysis of electroreduction of ni-trite. [27][28][29][30] In our prior work, we have displayed the capability of ferrocyanide, 31 poly(ortho-toluidine), 7 phosphotungstic heteropolyanion 32 and p-duroquinone 33 as catalysts for electroreduction of nitrite at the surface of carbon paste electrode (CPE). The aim of the present work is the electrosynthesis of the poly(4-aminoacetanilide) (PPAA) (Scheme I) at the surface of carbon paste electrode for construction of a simple and low cost electrochemical sensor for catalytic reductive detection of nitrite.…”

Section: Introductionmentioning

confidence: 99%

A Simple and Efficient Electrochemical Sensor for Electrocatalytic Reduction of Nitrite Based on Poly(4‐aminoacetanilide) Film Using Carbon Paste Electrode

Ojani

Raoof

Rahemi

2011

J Chinese Chemical Soc

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In this study, the electrochemical reduction of nitrite was investigated on poly(4-aminoacetanilide) (PPAA) forming by cyclic voltammetry at the surface of carbon paste electrode. The electrochemical properties of the modified electrode have been studied by cyclic voltammetry and double potential step chronoamperometry. Results showed that in the optimum condition (pH = 0.00) the reduction of nitrite occurred at a potential about 667 mV more positive than that unmodified carbon paste electrode. This amount of electrocatalytic ability is high compared with other electrocatalysts. Using a chronoamperometric method, the catalytic rate constant (k) was calculated 8.4 × 10 4 cm 3 mol -1 s -1 . Also, the electrocatalytic reduction peak currents was found to be linear with the nitrite concentration in the ranges of 5 × 10 -4 M to 2.5 × 10 -2 M and 2 × 10 -5 M to 7 × 10 -3 M with detection limits (2s) were determined as 4.5 × 10 -4 M and 1 × 10 -5 M by cyclic voltammetry (CV) and hydrodynamic amperometry methods respectively. Recovery experiments exhibit the satisfactory results.

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Compared Behaviours of Dawson-Type Tungstodiarsenates and -diphosphates

Cited by 40 publications

References 27 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

Electrocatalytic activity of copper alloys for $$\hbox{NO}_{3}^{-}$$ reduction in a weakly alkaline solution Part 1: Copper–zinc

A Simple and Efficient Electrochemical Sensor for Electrocatalytic Reduction of Nitrite Based on Poly(4‐aminoacetanilide) Film Using Carbon Paste Electrode

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