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dc.contributor.authorCOEY, JOHNen
dc.contributor.authorFERNANDEZ, DAMARISen
dc.contributor.authorDIAO, ZHUen
dc.contributor.authorDUNNE, PETERen
dc.date.accessioned2010-11-12T12:43:12Z
dc.date.available2010-11-12T12:43:12Z
dc.date.issued2010en
dc.date.submitted2010en
dc.identifier.citationDámaris Fernández, Zhu Diao, Peter Dunne and J.M.D. Coey, Influence of magnetic field on hydrogen reduction and co-reduction in the Cu/CuSO4 system, Electrochimica Acta, 55, 28, 2010, 8664-8672en
dc.identifier.otherYen
dc.identifier.urihttp://hdl.handle.net/2262/41148
dc.descriptionPUBLISHEDen
dc.description.abstractThe effects of an applied magnetic field of up to 5 T on hydrogen evolution and cathodic overpotential were studied for H2SO4 and an acidic Cu/CuSO4 system. Cyclic voltammetry, potentiostatic and galvanostatic deposition as well as electrochemical noise measurements were used. The magnetic field simultaneously increases the rate of hydrogen evolution and modifies the hydrogen bubble size. The periodicity of bubble release from a microelectrode is strongly influenced by the field, which may change the characteristic frequency or make it aperiodic, depending on the field orientation relative to buoyancy. The magnetic field stabilizes a bubble growing on a microelectrode, especially at high current densities. For example, bubble volume increases by a factor four in 1.5 T when the Lorentz force acts downwards. The noise spectra around 1 kHz are characteristic of a coalescence phenomenon. Hydrogen co-reduction with copper was studied by scanning electron microscopy and the current efficiency was measured with a quartz crystal microbalance; at -1.0 V it decreases from 95% to 75% in a field of 1.5 T. Bubble release is no longer periodic, but the noise spectrum has a characteristic shape depending on whether the current density is greater than, equal to or less than the diffusion-limited copper current. The field reduces the roughness of the copper deposit, but the current efficiency can be maximized by controlling the system galvanostatically, which allows a high copper deposition rate at overpotential lower than 0.5 V in the applied field, with smooth deposit quality.en
dc.description.sponsorshipThis work was supported by Science Foundation Ireland, as part of the MANSE project 05/IN/1850. We are grateful to Dr. Colm Faulkner for help with the FIB sectioning.en
dc.format.extent8664-8672en
dc.language.isoenen
dc.relation.ispartofseriesElectrochimica Actaen
dc.relation.ispartofseries55en
dc.relation.ispartofseries28en
dc.rightsYen
dc.subjectPhysicsen
dc.subjectmagnetoelectrodepositionen
dc.subjectelectrochemical noiseen
dc.titleInfluence of magnetic field on hydrogen reduction and co-reduction in the Cu/CuSO4 systemen
dc.typeJournal Articleen
dc.type.supercollectionscholarly_publicationsen
dc.type.supercollectionrefereed_publicationsen
dc.identifier.peoplefinderurlhttp://people.tcd.ie/jcoeyen
dc.identifier.rssinternalid67993en
dc.identifier.doihttp://dx.doi.org/10.1016/j.electacta.2010.08.004en
dc.subject.TCDThemeNanoscience & Materialsen
dc.contributor.sponsorScience Foundation Ireland (SFI)en


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