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Gorshenev, V. N.; Bibikov, S. B.; Novikov, Yu. N.

doi:10.1023/a:1025743305284

Cited by 10 publications

(9 citation statements)

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“…Samples based on GSM-1 graphite have a higher electrical conductivity than those based on GT-1, which indicates that this parameter is affected by the synthesis procedure and nature of the starting graphite. The electrical conductivity of pure TEG samples has the same order of magnitude as that reported in the literature [21]: 150 S cm !1 at a density of 140 g l !2 . An increase in the concentration of fluoroplastic and in the porosity of the material makes its electrical conductivity lower, which is natural because the amount of the electrically conducting material decreases and the contact resistance between TEG particles increases through formation of nonconducting layers.…”

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confidence: 74%

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Electrical Conductivity of Hydrophobized Electrodes Fabricated from Thermally Expanded Graphite and Their Activity in Electroreduction of Oxygen

et al. 2005

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Intercalation compounds of GT-1 and GAK-3 graphites were electrically synthesized in concentrated sulfuric and nitric acids. Porous composite samples based on thermally expanded graphite produced from electrochemically synthesized GT-1 graphite hydrosulfate, chemically synthesized GSM-1 graphite nitrate, and fluoroplastic-4D (1315 wt %), with a volume density of 650 31090 g l !2 , were fabricated and studied.Studies concerned with power cells pay a considerable attention to development and testing of new materials for electrodes to be used, in particular, in fuel cells. It is known that thermally expanded graphite (TEG) and articles made of this material possess a number of unique properties: high porosity, electrical conductivity, corrosion resistance, and thermal stability; manufacturability and ductility; and possibility of fabrication of complex-shaped articles from this material [133]. This circumstance, combined with the comparatively low cost of TEG, makes it a promising material for electrochemical systems. For example, it has been suggested to use TEG for improving the distribution of gas reagents in electrodes of fuel cells [4]. It has been shown that making the current collector of TEG improves parameters of fuel cells [5]. Use of modified TEG in the electrodes of electrochemical sensors for methanol has been studied [6]. Oxidation of peroxide and glucose has been examined on an electrode made of TEG modified with cobalt phthalocyanine [7]. It has been demonstrated that the electrochemical parameters of TEG depend on whether or not oxygen functional groups are present on its surface [8]. The possibility of phenol electrooxidation on TEG has been analyzed [9].Of interest in this context is to study a composite based on TEG and fluoroplastic, which shows a considerable hydrophobicity and chemical inertness at temperatures of up to 400oC. This composite can also be used to fabricate hydrophobized electrodes, which makes it possible to markedly raise the rate of electrochemical processes [10, 11].The aim of the present study was to examine the influence exerted by the composition of a porous composite TEG3fluoroplastic on its electrical conductivity and electrochemical activity in oxygen reduction in aqueous electrolytes. EXPERIMENTALGraphite intercalation compounds yielding TEG upon a thermal shock were obtained using electrochemical intercalation of acids. This method enables easy control over the degree of intercalation of acids into graphite and makes it possible to obtain intercalation compounds at lower acid concentrations without admixture of oxidizing agents [12]. For example, electrolysis in sulfuric [13315], nitric [16], and formic [17] acids has been described.The electrosynthesis was performed in a cylindrical glass electrolyzer with a thermostated jacket 1 and a horizontal position of the electrodes (Fig. 1). Onto the bottom electrode (anode) 2, having the form of a fine-mesh platinum grid on a porous glass partition 3, was placed a weighed portion 4 of graphite. A polypropylene diaphragm 5 ma...

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confidence: 74%

“…The electrical conductivity was measured by the four-probe potentiometric method [21]. The slope ratio of the dependence of voltage on current was used to find the resistance of a given sample, and then, using the known thickness and width of the sample, the electrical conductivity was calculated.…”

Section: Methodsmentioning

confidence: 99%

Electrical Conductivity of Hydrophobized Electrodes Fabricated from Thermally Expanded Graphite and Their Activity in Electroreduction of Oxygen

et al. 2005

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“…After measuring the mean value of the resis tance of the graphite layer R m , the volume resistivity of graphite powder was calculated by the formula [16] where h is the height of the specimen in the mold. h R π ρ = v It is known [17] that graphite foil rolled from expanded graphite powder (TEG) on a roll mill with out adding a binder has the highest conductivity as compared to composites, in which the dielectric binder layer between the graphite particles reduces the conductivity of the composite material. To prepare highly conducting binder free TEG samples, 3 mm thick sheet material with a bulk density of ~140 g/L was rolled on a roll mill to different thicknesses.…”

Section: Methodsmentioning

confidence: 99%

Glow and bulk expansion of oxidized graphites stimulated by electromagnetic radiation

Gorshenev

2012

Russ. J. Phys. Chem. B

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The results of studies on the interaction of oxidized graphites and electroconductive materials with the electromagnetic radiation of a microwave oven are presented. The effects of glow and expansion of oxidized graphites stimulated by microwave radiation in air and an inert atmosphere are studied. Differences in the character of expansion of oxidized graphites and conductive materials on a dielectric and metal sub strate under the influence of electromagnetic radiation are examined.

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“…In this work, as the electrode material was firstly used nanocarbon material -graphene-based thermally expanded graphite [36]. Technologies of thermal expansion of intercalated graphite particles and receiving of highly conductive materials with a well-developed surface belong to nanotechnological processes.…”

Section: Development Of the Bioanode Of A Fuel Element On The Basis Omentioning

confidence: 99%

“…The electrode was dried at room temperature, it was applied 20 mcl of a 2% solution of chitosan in 1% acetic acid [49], and then it was dried at room temperature within 30 min. The sinthesis of TRG was carried out on hydrosulphatic technology [36]. The process of TRG receiving included three main stages: 1) formation of intercalation connection (graphite hydrogensulphate) with stirring of low-ash graphite (GSM-1) within 30 min with a mixture of concentrated nitric and sulfuric acids at their ratio of 10:1 within thirty minutes.…”

Section: Development and Production Of The Bianode Modelmentioning

confidence: 99%