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Characterisation and electrochemical behaviour of electrodeposited Cu-Fe foams applied as pseudocapacitor electrodes

2015-01-15Journal article Restricted access
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dc.contributor.authorLange, G. A.
dc.contributor.authorEugénio, Sónia
dc.contributor.authorDuarte, R. G.
dc.contributor.authorSilva, Maria Teresa Oliveira de Moura e
dc.contributor.authorCarmezim, M. J.
dc.contributor.authorMontemor, Maria de Fátima
dc.date.accessioned2016-03-08T14:44:01Z
dc.date.available2016-03-08T14:44:01Z
dc.date.issued2015-01-15
dc.description.abstractCopper iron (Cu-Fe) 3D porous foams for supercapacitor electrodes were electrodeposited in the cathodic regime, on stainless steel current collectors, using hydrogen bubbling dynamic template. The foams were prepared at different current densities and deposition times. The foams were submitted to thermal conditioning at temperatures of 150 and 250 degrees C. The morphology, composition and structure of the formed films were studied by SEM, EDS and XRD, respectively. The electrochemical behaviour was studied by cyclic voltammetry, electrochemical impedance spectroscopy and chronopotentiometry. The morphology of the 3D Cu-Fe foams is sensitive to the electrodeposition current and time. The increase of the current density produces a denser, larger and more ramified dendritic structure. Thermal conditioning at high temperature induces a coarser grain structure and the formation of copper oxides, which affect the electrochemical behaviour. The electrochemical response reveals the presence of various redox peaks assigned to the oxidation and reduction of Cu and Fe oxides and hydroxides in the foams. The specific capacitance of the 3D Cu Fe foams was significantly enhanced by thermal conditioning at 150 degrees C. The highest specific capacitance values attained 297 Fg(-1) which are much above the ones typically observed for single Cu or Fe Oxides and hydroxides. These values highlight a synergistic behaviour resulting from the combination of Cu and Fe in the form of nanostructured metallic foams. Moreover, the capacitance retention observed in an 8000 charge/discharge cycling test was above 66%, stating the good performance of these materials and its enhanced electrochemical response as supercapacitor negative electrodes. (C) 2014 Elsevier B.V. All rights reserved.pt_PT
dc.identifier.citationLANGE, G. A.; [et al.] - Characterisation and electrochemical behaviour of electrodeposited Cu-Fe foams applied as pseudocapacitor electrodes. Journal of Electroanalytical Chemistry. ISSN. 1572-6657. Vol. 737, SI (2015), pp. 85-92pt_PT
dc.identifier.doi10.1016/j.jelechem.2014.10.025pt_PT
dc.identifier.issn1572-6657
dc.identifier.issn1873-2569
dc.identifier.urihttp://hdl.handle.net/10400.21/5804
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevier Science SApt_PT
dc.relation.ispartofseriesSI;
dc.relation.publisherversionhttp://www.sciencedirect.com/science/article/pii/S1572665714004718pt_PT
dc.subjectBioresorbable alloypt_PT
dc.subjectCorrosionpt_PT
dc.subjectFunctional coatingpt_PT
dc.subjectCell adhesionpt_PT
dc.titleCharacterisation and electrochemical behaviour of electrodeposited Cu-Fe foams applied as pseudocapacitor electrodespt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage92pt_PT
oaire.citation.startPage85pt_PT
oaire.citation.volume737pt_PT
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT

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