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dc.contributor.authorJiménez Olivares, María Luisa 
dc.contributor.authorFernández, M. Mar
dc.contributor.authorAhualli, Silvia
dc.contributor.authorIglesias, Guillermo R.
dc.contributor.authorDelgado, Ángel V.
dc.date.accessioned2013-05-28T06:14:34Z
dc.date.available2013-05-28T06:14:34Z
dc.date.issued2013-07-15
dc.identifier.citationJiménez, M.L.; et al. Predictions of the maximum energy extracted from salinity exchange inside porous electrodes. Journal of Colloid and Interface Science, 402: 340-349 (2013). [http://hdl.handle.net/10481/25987]es_ES
dc.identifier.issn0021-9797
dc.identifier.otherdoi: 10.1016/j.jcis.2013.03.068
dc.identifier.otherPMID: 23643252
dc.identifier.urihttp://hdl.handle.net/10481/25987
dc.description.abstractCapacitive energy extraction based on double layer expansion (CDLE) is the name of a new method devised for extracting energy from the exchange of fresh and salty water in porous electrodes. It is based on the change of the capacitance of electrical double layers (EDLs) at the electrode/solution interface when the concentration of the bulk electrolyte solution is modified. The use of porous electrodes provides huge amounts of surface area, but given the typically small pore size, the curvature of the interface and EDL overlap should affect the final result. This is the first aspect dealt with in this contribution: we envisage the electrode as a swarm of spherical particles, and from the knowledge of their EDL structure, we evaluate the stored charge, the differential capacitance and the extracted energy per CDLE cycle. In all cases, different pore radii and particle sizes and possible EDL overlap are taken into account. The second aspect is the consideration of finite ion size instead of the usual point-like ion model: given the size of the pores and the relatively high potentials that can be applied to the electrode, excluded volume effects can have a significant role. We find an extremely strong effect: the double layer capacitance is maximum for a certain value of the surface potential. This is a consequence of the limited ionic concentration at the particle- solution interface imposed by the finite size of ions, and leads to the presence of two potential ranges: for low electric potentials the capacitance increases with the ionic strength, while for large potentials we find the opposite trend. The consequences of these facts on the possibility of net energy extraction from porous electrodes, upon changing the solution in contact with them, are evaluated.es_ES
dc.description.sponsorshipDepartamento de Física Aplicada, Grupo de Física de Interfases y Sistemas Coloidales,Facultad de Ciencias, Universidad de Granada.es_ES
dc.description.sponsorshipThe research leading to these results received funding from the European Union 7th Framework Programme (FP7/2007-2013) under Agreement No. 256868. Further financial support to S.A. from Junta de Andalucía (Spain) Project PE-2008-FQM3993.es_ES
dc.language.isoenges_ES
dc.publisherElsevieres_ES
dc.relationinfo:eu-repo/grantAgreement/EC/FP7/256868es_ES
dc.subjectCapMixes_ES
dc.subjectElectric double layer expansiones_ES
dc.subjectEnergy extraction from salinity exchangees_ES
dc.subjectIonic size effectses_ES
dc.titlePredictions of the maximum energy extracted from salinity exchange inside porous electrodeses_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.rights.accessRightsinfo:eu-repo/semantics/openAccesses_ES
dc.relation.publisherversionhttp://dx.doi.org/10.1016/j.jcis.2013.03.068es_ES


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