Electrochemistry of metal nanoparticles: the effect of substrate

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

doi:10.1007/s10008-012-1721-8

Cited by 34 publications

(52 citation statements)

References 18 publications

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“…As is easily observed, when dispersion increases, the peak potential shifts to more positive values, I m and I m /Q 0 decrease, and electrooxidation occurs in a wider range of potentials. These features explain the earlier mentioned small differences between the calculated and experimental data observed in [4][5][6]8].…”

Section: Theory Calculationsupporting

confidence: 54%

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The effect of the system polydispersity on voltammograms of nanoparticles electrooxidation

Брайнина

Gal'perin

Vikulova

et al. 2012

J Solid State Electrochem

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The paper proposes a mathematical model describing electrooxidation of a polydisperse system of metal nanoparticles from the surface of an indifferent macroelectrode. It is shown that the degree of dispersion of a nanoparticle ensemble affects the shape of oxidation voltammograms. When the degree of dispersion rises and the average size of nanoparticles becomes smaller, the range of oxidation potentials increases. The results of the experimental study of electrooxidation of gold nanoparticles with different degrees of dispersion are given. The particles were localized on the surface of graphite screen-printed electrodes. A good agreement between the parameters of the experimental and calculated voltammograms confirms the correctness of the proposed model.

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Section: Theory Calculationsupporting

confidence: 54%

“…Therefore, in general, degree of dispersity should be taken into account interpreting the processes involving polydisperse system participation. This assumption is supported by observed differences in the shape of voltammograms calculated with the use of a mono-model and obtained experimentally [4][5][6]8].…”

Section: Introductionmentioning

confidence: 67%

The effect of the system polydispersity on voltammograms of nanoparticles electrooxidation

Брайнина

Gal'perin

Vikulova

et al. 2012

J Solid State Electrochem

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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: 56%

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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“…69 The results showed that the shift of the oxidation potential of the NPs was more negative for small sizes if the substrate was inert to the particle. The shift was more positive if the metal nanoparticle interacted with the substrate, which provided stability.…”

Section: Effect Of Surface Charge and Electrode Materialsmentioning

confidence: 98%

“…69 One of them is the (-) shift of According to previous work by Brainina and co-workers a positive shift will be displayed in the oxidation of Au NPs with 10 nm diameter on Pt when compared to glassy carbon; however, there was no significant shift for Au NPs with 150 nm diameter on the two substrates. 69 Their overall conclusion was that the electrode has a greater influence on smaller Au NPs due to an increased number of interaction points relative to larger NPs.…”

Section: Effect Of Surface Charge and Electrode Materialsmentioning

confidence: 99%

The unique electrochemical reactivity of small metal nanoparticles.

Masitas¹

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Electrochemistry of metal nanoparticles: the effect of substrate

Cited by 34 publications

References 18 publications

The effect of the system polydispersity on voltammograms of nanoparticles electrooxidation

The effect of the system polydispersity on voltammograms of nanoparticles electrooxidation

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

The unique electrochemical reactivity of small metal nanoparticles.

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