Electrochemical impedance spectroscopy of conductor—insulator composite electrodes: Properties in the blocking and diffusive regimes

Navarro-Laboulais, J.; Trijueque, J.; Garcı́a-Jareño, J.J.; Benito, D.; Vicente, F.

doi:10.1016/s0022-0728(97)00545-7

Cited by 33 publications

(28 citation statements)

References 49 publications

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“…Corrosion of the Zn-particles on the surface yields accumulate amounts of salt placed over them only as is showed in mapping treatment of EDAX-SEM micrographs ( Figure 1). This is consistent with isolated polymer/conducting particles that have a low capacitive response [1,2]. The addition of zinc metal particles to a polypropylene + graphite matrix increases considerably the conductivity of the resulting ternary composite material.…”

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confidence: 76%

Characterization of a New Polypropylene+Graphite+Zinc Ternary Composite

et al. 2013

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A new ternary composite prepared from graphite-powder (40% in weight) and zinc-powder (10% in weight) randomly dispersed into a polypropylene matrix (50% in weight) was characterized by means of electrical and electrochemical procedures. This composite electrode shows promising electrochemical properties like zinc metal since it presents a high electrical conductivity. Moreover, their low density and plastic performance makes of this material a suitable for substitute occasionally to the zinc metal in certain technological uses

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confidence: 76%

Characterization of a New Polypropylene+Graphite+Zinc Ternary Composite

et al. 2013

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“…In all the analyzed composite samples the graphite content was greater than that required to overcome the first percolation threshold of the polymer + graphite binary system [21,[29][30][31]. The presence of metal powder in the matrix causes an increase in the system conductivity.…”

Section: Conductivity Of Composite Materialsmentioning

confidence: 95%

“…Conducting particles + polymer composite materials are widely used in industry in low density metal structures and also as negative electrode materials in batteries [18]. From a fundamental point of view, the electrochemical behaviour and the preparation of these materials show interesting theoretical and experimental features [17,[19][20][21][22][23][24][25][26][27]. In general, graphite improves the electrical and other physical properties of the plastic component of these composites.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical dissolution and passivation of nickel powder randomly dispersed in a graphite + polypropylene matrix

et al. 2006

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Nickel powder (10% in weight) randomly dispersed in a graphite (40%) + polypropylene (50%) matrix was studied as a composite electrode in a sulphuric-sulphate acid medium by means of voltammetry and Electrochemical Impedance Spectroscopy (EIS). Under voltammetric conditions, this thermoplastic material shows an electrochemical behaviour similar to nickel metal. However, under EIS measurement conditions the electrodissolution behaviour of the nickel powder is partially limited by the diffusion of the anions in the electrolyte in order to electroneutralize the excess of electrogenerated positive charge. The low frequency range of the measured impedance spectra can be interpreted as a parallel arrangement of a capacitive and a Warburg impedance, instead of a CPE element initially considered in the fitting. Values for CPE exponents lower than 0.85 are interpreted as a competition between a capacitive/transport contribution to the overall impedance response.

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“…The electrochemical behaviour is the result of some interacting factors such as solid electron conductivity and mass transport of electroactive substances towards the electrode [1]. The direct contact of neighbour conducting particles allows electrical conduction through the solid and the percolation theory aims to explain the universal relations between the physical properties (i.e.…”

Section: Introductionmentioning

confidence: 99%

“…the bulk resistivity or the volume fraction of the conductive phase) [2,3]. Graphite + polymer composites exhibit high solid bulk resistance [4][5][6] and very small relaxation times which, compared with the time scale of electrochemical experiments, allow us to disregard the details of the percolation phenomena through the solid and thus consider them as perfect resistors [1].…”

Section: Introductionmentioning

confidence: 99%