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Capacitance characteristics of carbon-based electrochemical capacitors exposed to heteropolytungstic acid electrolyte

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dc.abstract.enA Keggin-type heteropolytungstic acid, H3PW12O40, is evaluated as new high ionic conductivity aqueous electrolyte of potential interest for electrochemical capacitors, with enhanced safety and low environmental concern. For the performance evaluation, two types of electrode materials have been selected, i.e. mesoporous multi-walled carbon nanotubes and microporous activated carbons. To address the influence of changes in the porous structure and surface properties on capacitors performance, the materials have been subjected to additional oxidation treatment under liquid or gas phase conditions. The electrochemical parameters of two-electrode cells were evaluated from a series of voltammetric, galvanostatic, constant power, and AC impedance measurements and compared with those obtained for conventional H2SO4 electrolyte. It has been shown that due to the size of the heteropolytungstate anion (exceeding 1 nm), the selection of carbon electrode materials in terms of appropriate porous structure and wettability is a key factor in avoiding capacitance limitations. As a result, the specific capacitance, energy density as well as the rate capability of H3PW12O40 supported capacitors may approach the performance of conventional H2SO4-based systems. Furthermore, the potentiodynamic anodic polarization tests and post-mortem scanning electron microscopy analysis confirmed a higher corrosion resistance of 316 L type steel in the presence of H3PW12O40 solution, in comparison to the conventional H2SO4 electrolyte. It enables stable capacitor performance upon utilization of low cost non-noble current collectors which was evaluated during galvanostatic cycling (13 000 cycles) and accelerated ageing by potentiostatic floating during 120 h.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorDyjak, Sławomir
dc.contributor.authorSkunik-Nuckowska, Magdalena
dc.contributor.authorKulesza, Paweł
dc.contributor.authorGrzejszczyk, Katarzyna
dc.contributor.authorBéguin, François
dc.contributor.authorWisińska, Natalia Honorata
dc.date.accessioned2024-01-24T19:03:43Z
dc.date.available2024-01-24T19:03:43Z
dc.date.issued2018
dc.description.financeNie dotyczy
dc.description.volume282
dc.identifier.doi10.1016/J.ELECTACTA.2018.06.070
dc.identifier.issn0013-4686
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/102702
dc.identifier.weblinkhttps://www.sciencedirect.com/science/article/pii/S0013468618313586
dc.languageeng
dc.pbn.affiliationchemical sciences
dc.relation.ispartofElectrochimica Acta
dc.relation.pages533-543
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.subject.enElectrochemical capacitor
dc.subject.enKeggin-type heteropolytungstic acid
dc.subject.enDouble-layer capacitance
dc.subject.enAqueous electrolyte
dc.titleCapacitance characteristics of carbon-based electrochemical capacitors exposed to heteropolytungstic acid electrolyte
dc.typeJournalArticle
dspace.entity.typePublication