Naslov
Impedance of electrochemically modified graphite

Autori
Magdić, Katja ; Kvastek, Krešimir ; Horvat-Radošević, Višnja

Izvornik
Acta chimica Slovenica (1318-0207) 61 (2014), 2; 366-375

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
graphite; oxidized graphite; expanded graphite; electrochemical impedance spectroscopy

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Kemijsko inženjerstvo

Napomena
Rad je temeljen na prezentaciji sa skupu 4th RSE-SEE 2013 Symposium on Electrochemistry, održanom u Ljubljani, Slovenija.

POVEZANOST RADA