Impedance of electrochemically modified graphite

Magdić, Katja; Kvastek, Krešimir; Horvat-Radošević, Višnja (2014) Impedance of electrochemically modified graphite. Acta Chimica Slovenica, 61 (2). pp. 366-375. ISSN 1318-0207

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Abstract

Electrochemical impedance spectroscopy, EIS, has been applied for characterization of electrochemically modified graphite electrodes in the sulphuric acid solution. Graphite modifications were performed by potential cyclization between potentials of graphite oxide formation/reduction, different number of cycles, and prolonged reduction steps after cyclization. Impedance spectra measured at two potential points within double-layer region of graphite, have been successfully modeled using the concept of porous electrodes involving two different electrolyte diffusion paths, indicating existence of two classes of pores. The evaluated impedance parameter values show continuous changes with stages of graphite modification, indicating continuous structural changes of pores by number of potential cycles applied. Differences of impedance parameter values at two potential values indicate the potential induced changes of solution properties within the pores of modified graphite.

Item Type:	Article
Uncontrolled Keywords:	graphite; oxidized graphite; expanded graphite; electrochemical impedance spectroscopy
Subjects:	NATURAL SCIENCES > Chemistry TECHNICAL SCIENCES > Chemical Engineering
Divisions:	Division for Marine and Enviromental Research
Projects:	Project title Project leader Project code Project type Temeljna i primijenjena istraživanja vodljivih polimera Zoran Mandić 125-1252973-2576 MZOS Elektroaktivni filmovi za ekološki prihvatljivu konverziju i pohranu energije Višnja Horvat-Radošević 098-0982904-2905 MZOS
Depositing User:	Višnja Horvat-Radošević
Date Deposited:	28 Jul 2016 12:53
URI:	http://fulir.irb.hr/id/eprint/2989

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