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Combined investigation of bulk diffusion and surface exchange parameters of silver catalyst coated yttrium-doped BSCF membranes

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Combined investigation of bulk diffusion and surface exchange parameters of silver catalyst coated yttrium-doped BSCF membranes

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dc.contributor.author Haworth, Patrick es_ES
dc.contributor.author Smart, Simon es_ES
dc.contributor.author Serra Alfaro, José Manuel es_ES
dc.contributor.author Diniz da Costa, Joe es_ES
dc.date.accessioned 2017-09-18T09:24:19Z
dc.date.available 2017-09-18T09:24:19Z
dc.date.issued 2012
dc.identifier.issn 1463-9076
dc.identifier.uri http://hdl.handle.net/10251/87412
dc.description.abstract [EN] The combined effect of minor yttrium doping and silver catalyst deposition on the surface kinetics (kchem) and bulk diffusion (D-chem) of BSCF (Ba0.5Sr0.5Co0.8Fe0.2O3-d) perovskite membranes was explored using electrical conductivity relaxation (ECR) and validated using oxygen permeation measurements. Yttrium doping of BSCF to form Ba0.5Sr0.5Co0.8Fe0.175Y0.025O3-d (BSCFY) improved both the surface exchange kinetics and the bulk diffusion by an average of 44% and 177% respectively, supporting improved oxygen permeation measurements. The deposition of a silver catalyst on BSCFY further improved the surface kinetics by 63-450% at intermediate operating temperatures (600-750 degrees C), and reduced the activation energy from 163 to 90 kJ mol(-1). Interestingly, these improvements did not translate into enhanced oxygen fluxes for the silver coated thicker 0.5 and 1 mm membranes, indicating that the oxygen ion transport was limited by bulk diffusion. However, oxygen permeation measurements on catalyst-coated 0.3 mm-thick membranes yielded improvements of 20-35% in the range 600-900 degrees C. The silver catalyst was beneficial in overcoming surface kinetic limitations for the thinner 0.3 mm BSCFY membranes, thus suggesting that the critical thickness of BSCFY membranes lies around similar to 0.4 mm and validating the ECR measurements. es_ES
dc.description.sponsorship Patrick Haworth acknowledges the PhD scholarship provided by the Australian Government and The University of Queensland, and the International Travel Award provided by the University of Queensland Graduate School. The authors would like to thank the Australian Research Council (grant DP0878849) and Spanish Ministry for Science and Innovation (grant ENE2011-24761) for financial support of this research project. en_EN
dc.language Inglés es_ES
dc.publisher Royal Society of Chemistry es_ES
dc.relation.ispartof Physical Chemistry Chemical Physics es_ES
dc.rights Reserva de todos los derechos es_ES
dc.subject Condictivity relaxation experiments es_ES
dc.subject Hollow-fiber membranes es_ES
dc.subject Oxygen permeation es_ES
dc.subject Electrical conductivity es_ES
dc.subject Perovskite membranes es_ES
dc.subject Permeable membrane es_ES
dc.subject BA0.5SR0.5CO0.8FE0.2O3-DELTA es_ES
dc.subject Stability es_ES
dc.subject Transport es_ES
dc.subject Oxides es_ES
dc.title Combined investigation of bulk diffusion and surface exchange parameters of silver catalyst coated yttrium-doped BSCF membranes es_ES
dc.type Artículo es_ES
dc.identifier.doi 10.1039/c2cp41226h
dc.relation.projectID info:eu-repo/grantAgreement/MICINN//ENE2011-24761/ES/DESARROLLO DE NUEVOS DISPOSITIVOS IONICOS PARA LA PRODUCCION EFICIENTE Y SOSTENIBLE DE ENERGIA Y PRODUCTOS QUIMICOS%2FCOMBUSTIBLES/ es_ES
dc.relation.projectID info:eu-repo/grantAgreement/ARC/Discovery Projects/DP0878849/AU/Perovskite Asymmetric Hollow Fibres for Oxygen Separation in Clean Coal Energy Delivery/
dc.rights.accessRights Cerrado es_ES
dc.contributor.affiliation Universitat Politècnica de València. Instituto Universitario Mixto de Tecnología Química - Institut Universitari Mixt de Tecnologia Química es_ES
dc.description.bibliographicCitation Haworth, P.; Smart, S.; Serra Alfaro, JM.; Diniz Da Costa, J. (2012). Combined investigation of bulk diffusion and surface exchange parameters of silver catalyst coated yttrium-doped BSCF membranes. Physical Chemistry Chemical Physics. 14(25):9104-9111. https://doi.org/10.1039/c2cp41226h es_ES
dc.description.accrualMethod S es_ES
dc.relation.publisherversion http://doi.org/10.1039/c2cp41226h es_ES
dc.description.upvformatpinicio 9104 es_ES
dc.description.upvformatpfin 9111 es_ES
dc.type.version info:eu-repo/semantics/publishedVersion es_ES
dc.description.volume 14 es_ES
dc.description.issue 25 es_ES
dc.relation.senia 222954 es_ES
dc.identifier.eissn 1463-9084
dc.identifier.pmid 22644312
dc.contributor.funder Ministerio de Ciencia e Innovación es_ES
dc.contributor.funder Australian Research Council


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