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dc.creatorPanić, Vladimir
dc.creatorStevanović, R.M.
dc.creatorJovanović, Vladislava
dc.creatorDekanski, Aleksandar
dc.date.accessioned2019-01-30T17:19:02Z
dc.date.available2019-01-30T17:19:02Z
dc.date.issued2008
dc.identifier.issn0378-7753
dc.identifier.urihttp://cer.ihtm.bg.ac.rs/handle/123456789/475
dc.description.abstractElectrochemical properties and porous-structure-dependent capacitive ability of commercial carbon blacks, Black Pearls 2000® (BP) and Vulcan® XC 72R (XC), were investigated in H2SO4 solution by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The capacitance in-depth profile is correlated to microscopic appearance of carbon blacks in the form of a thin layer applied over Au substrate from water suspensions of BP and XC. The capacitance calculated from voltammetric charge was found to depend on the sweep rate, due to porosity of investigated materials. Impedance (EIS) characteristics upon frequency-dependent charge/discharge process indicate transmission line electric behavior of BP and XC. Capacitance and resistance values obtained by simulations of EIS data, enabled estimation of capacitance and resistance profile throughout carbon black porous electrodes. Capacitance of BP carbon layer increases going from the outer surface towards the bulk of the layer. External capacitance originates from capacitive characteristics of the macroscopic surface consisting of relatively large agglomerates, while internal capacitance originates from "inner" surface of micro-porous agglomerates. Contrary to BP, opposite distribution of the total capacitance to external and internal part was found for XC, caused by its loose structure and considerably lower real surface area in comparison to BP. The XC morphology makes additionally the pseudocapacitive contribution of surface functionalities more pronounced, which indirectly shifts also the "internal" double-layer capacitive response to higher frequencies through the effect of increased wettability of the layer. Thus, the capacitance of XC surface directly exposed to the electrolyte is larger than that of the inner one, which makes it a "fully-utilized" capacitor, while increased capacitive performance of BP emerges only at very low frequencies of charging/discharging process.en
dc.relationinfo:eu-repo/grantAgreement/MESTD/MPN2006-2010/142048/RS//
dc.rightsrestrictedAccess
dc.sourceJournal of Power Sources
dc.subjectCarbon blacken
dc.subjectDouble-layer capacitanceen
dc.subjectElectrochemical impedance spectroscopy (EIS)en
dc.subjectElectrochemical supercapacitorsen
dc.subjectPseudocapacitanceen
dc.titleElectrochemical and capacitive properties of thin-layer carbon black electrodesen
dc.typearticle
dc.rights.licenseARR
dcterms.abstractДекански, Aлександар; Стевановић, Р.М.; Јовановић, Владислава; Панић, Владимир;
dc.citation.volume181
dc.citation.issue1
dc.citation.spage186
dc.citation.epage192
dc.citation.other181(1): 186-192
dc.citation.rankaM21
dc.identifier.doi10.1016/j.jpowsour.2008.03.048
dc.identifier.rcubConv_4154
dc.identifier.scopus2-s2.0-43249085412
dc.identifier.wos000257004500029
dc.type.versionpublishedVersion


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