The effect of the system polydispersity on voltammograms of nanoparticles electrooxidation

Брайнина, Х. З.; Gal'perin, L. G.; Vikulova, E.; Galperin, A. L.

doi:10.1007/s10008-012-1852-y

Cited by 18 publications

(16 citation statements)

References 9 publications

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“…Even if we admit that their shape is fuzzy, this shape must be "uniform" with similar characteristics in size and structure. Brainina et al studies [23][24][25][26][27][28] show very well the shifts of the peaks that are consistent with the positive values of the tension, τ. But the considered systems are usually too widely polydisperse for properly applying eq.…”

Section: Resultssupporting

confidence: 55%

Displacement of voltammetric peaks with nanoparticles size: a nonextensive thermodynamic approach

Letellier

Turmine

2014

Electrochimica Acta

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We show here that the concepts of nonextensive thermodynamics (NET), described previously (J. Phys. Chem. B, 2004, 108, 18980) and applied to redox behaviour of nanoparticles (J. Phys.Chem. C, 2008, 112, 12116) can be used to express by a power law the variations to the electrochemical kinetics of nanoparticles and in particular to voltammetry. We proposed here a generalization of Plieth's relationship for non-spherical aggregates by assuming that the interface between the particle and its environment is fuzzy. Thus, the relations of non-extensive thermodynamics can quantitatively account for the displacements of electro-oxidation potentials of metal nanoparticles deposited on electrodes, according to their measured size. Our approach also permits to formally justify the stability of the particles may increase as their size decreases, (τ < 0). This is usually found when the aggregates are in close contact with a matrix (in the case, for example, of embedded particles).

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Section: Resultssupporting

confidence: 55%

Displacement of voltammetric peaks with nanoparticles size: a nonextensive thermodynamic approach

Letellier

Turmine

2014

Electrochimica Acta

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“…These data are due to the formation of larger aggregates of silver. An analogical effect is found for gold nanoparticles in 21 . It is found that electrochemical activity of AgNPs does not depend on the order of addition of reagents during their obtainment (curves (-), (···), Fig.…”

Section: Resultsmentioning

confidence: 90%

Synthesis of Silver Nanoparticles in the Presence of Polyethylene Glycol and their Electrochemical Behavior at a Graphite Electrode by Cyclic Voltammetry

Перевезенцева¹,

Вайтулевич²,

Bimatov³

2018

Orient. J. Chem

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The shape, size, optical properties and electrochemical activity of the silver nanoparticles (AgNPs) were studied, as well as their dependence on the amount of the reducing agent, the method of initiation of the formation of nanoparticles and the introduction order of reagents in the reaction mixture. It was determined that in the sols obtained without polyethylene glycol (PEG) AgNPs are predominant with the average size of 40 nm. With PEG the triangular AgNps predominate with the average size of 20 nm due to the silver ions reduction on the surface of the nuclei. It was determined that AgNPs are most active when obtained with PEG and the molar ratio [Ag]:[C 6 H 5 O73-] = 1:5. On the anodic branch of the cyclic AgNPs curve the splitting of anodic maximum into two due to AgNPs oxidation was observed. AgNPs obtained in the presence of PEG by light have the most electrochemical activity. The processes of AgNPs oxidation become easier when PEG is present which is caused by the formation of the most stable silver oxides.

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“…SPE was rinsed thoroughly with distilled water. They were used as it is ΔG°Free Gibbs energy of nanoparticles c 4,592 J mol −1 a Diffusion coefficient is taken as intermediate magnitude between 1.028×10 −5 and 3.39×10 −5 cm 2 s −1 given in [19] and [20] b Standard ox/red potential is calculated for pH=3, using the magnitude E°=0.18 V given in [21] for pH=7 c ΔG°for nanoparticles size equal to 8 nm is calculated with the use of formula (14) from [23] Calculation parameters: k chem =4×10 9 , r NO2 =0 (a), k chem = 0, r NO2 =0 (b), k chem =0, r NO2 =149 pm (c). Other parameters are given in Table 1 Fig .…”

Section: Electrodes Preparationmentioning

confidence: 99%

Mathematical modeling and experimental study of electrode processes

Брайнина

Gal'perin

Bukharinova

et al. 2014

J Solid State Electrochem

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The purpose of this paper is to propose mathematical modeling of different kinds of electrochemical processes. Electrooxidation of nitrite ions on some types of electrodes (glassy carbon, screen-printed carbon-containing, gold, and gold nanoparticles) and oxidation of ascorbic acid on gold electrodes nonmodified and modified by gold nanoparticles were used for the comparison of calculated and experimental data. It is shown that in each case, a specific shape of the voltammogram helps to identify the mechanism of the process. The comparison of the theoretical and experimental data shows that the process of oxidation of nitrite ions causes passivation of the electrode by adsorbed products of electrooxidation, and nanoeffects are not observed at that. Nanoeffects were observed in the oxidation of ascorbic acid on gold nanoparticles localized on gold electrode.

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The effect of the system polydispersity on voltammograms of nanoparticles electrooxidation

Cited by 18 publications

References 9 publications

Displacement of voltammetric peaks with nanoparticles size: a nonextensive thermodynamic approach

Displacement of voltammetric peaks with nanoparticles size: a nonextensive thermodynamic approach

Synthesis of Silver Nanoparticles in the Presence of Polyethylene Glycol and their Electrochemical Behavior at a Graphite Electrode by Cyclic Voltammetry

Mathematical modeling and experimental study of electrode processes

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