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Electrochemical response of 70Co-30Ni highly branched 3D-dendritic structures for charge storage electrodes

2015-06-10Journal article Restricted access
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dc.contributor.authorSilva, R. P.
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.accessioned2016-03-08T15:39:24Z
dc.date.available2016-03-08T15:39:24Z
dc.date.issued2015-06-10
dc.description.abstractA 70Co-30Ni dendritic alloy was produced on stainless steel by pulse electrodeposition in the cathodic domain, and oxidized by potential cycling. X-ray diffraction (XRD) identified the presence of two phases and scanning electron microscopy (SEM) evidenced an open 3D highly branched dendritic morphology. After potential cycling in 1 M KOH, SEM and X-ray photoelectron spectroscopy (XPS) revealed, respectively, the presence of thin nanoplates, composed of Co and Ni oxi-hydroxides and hydroxides over the original dendritic film. Cyclic voltammetry tests showd the presence of redox peaks assigned to the oxidation and reduction of Ni and Co centres in the surface film. Charge/discharge measurements revealed capacity values of 121 mAh g(1) at 1 mA cm(2). The capacity retention under 8000 cycles was above 70%, stating the good reversibility of these redox materials and its suitability to be used as charge storage electrodes. Electrochemical impedance spectroscopy (EIS) spectra, taken under different applied bias, showed that the capacitance increased when the electrode was fully oxidized and decreased when the electrode was reduced, reflecting different states-of-charge of the electrode. (C) 2015 Elsevier Ltd. All rights reserved.pt_PT
dc.identifier.citationSILVA, R. P.; [et al.] - Electrochemical response of 70Co-30Ni highly branched 3D-dendritic structures for charge storage electrodes. Electrochimica Acta. ISSN. 0013-4686. Vol. 167 (2015), pp. 13-19pt_PT
dc.identifier.doi10.1016/j.electacta.2015.03.083pt_PT
dc.identifier.issn0013-4686
dc.identifier.issn1873-3859
dc.identifier.urihttp://hdl.handle.net/10400.21/5808
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherPergamon-Elsevier Science Ltdpt_PT
dc.relation.publisherversionhttp://www.sciencedirect.com/science/article/pii/S0013468615006805pt_PT
dc.subject70Co-30Ni 3D-dendritic electrodept_PT
dc.subjectCo-Ni oxides/hydroxides nanoplates charge storagept_PT
dc.subjectElectrochemical impedance spectroscopypt_PT
dc.titleElectrochemical response of 70Co-30Ni highly branched 3D-dendritic structures for charge storage electrodespt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage19pt_PT
oaire.citation.startPage13pt_PT
oaire.citation.volume167pt_PT
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT

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