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dc.contributor.authorDos Santos-Gómez, Lucía
dc.contributor.authorPorras-Vázquez, José Manuel
dc.contributor.authorRamírez Losilla, Enrique
dc.contributor.authorMarrero-López, David 
dc.date.accessioned2015-07-13T11:45:55Z
dc.date.available2015-07-13T11:45:55Z
dc.date.created2015
dc.date.issued2015-07-13
dc.identifier.urihttp://hdl.handle.net/10630/10072
dc.description.abstractSolid oxide fuel cells (SOFCs) are one of the most efficient technologies for direct conversion of fuels to electricity. La0.8Sr0.2MnO3-δ (LSM) is the cathode material most widely used in SOFCs [1], however, LSM exhibits high activation energy for oxygen reduction reaction (ORR) and low ionic conductivity, which limits its application at reduced temperatures. In this material the electrochemically active reaction sites are restricted to the triple-phase boundary (TPB) near the electrolyte/electrode interface, where the electrolyte, air and electrode meet. Different strategies have been investigated to enlarge the TPB area of LSM, such as the production of nanocrystalline powders by precursor routes, preparation of composites by infiltration methods and thin films [2-4]. Here we present and compare innovative procedures to extend the TPB of LSM in contact with yttria-stabilized zirconia electrolyte: i) nanocrystalline LSM films deposited by spray-pyrolysis on polished YSZ electrolyte; ii) the addition of polymethyl methacrylate microspheres as pore formers during the spray-pyrolysis deposition to further increase the porosity of these films and (iii) the deposition of LSM by spray-pyrolysis on porous backbones of Zr0.84Y0.16O1.92 (YSZ), Ce0.9Gd0.1O1.95 (CGO) and Bi1.5Y0.5O3- (BYO) electrolytes previously fixed onto the YSZ electrolyte. The most remarkable peculiarity of this novel preparation method, compared to the traditional impregnation, is the formation of LSM thick film of 500 nm on the electrode surface (Fig. 1), which improves the electrical conductivity of the composite cathode. Thus, the optimization of this novel method would be an alternative to the classical infiltration with several advantages for the industry of planar SOFCs allowing the deposition of a wide variety of ceramic films over large areas with more uniform distribution of the catalyst, lower cost and only one deposition step is required to form the electrode. The morphology and electrochemical performance of the electrode have been investigated by scanning electron microscopy and impedance spectroscopy. Very low values of area specific resistance were obtained ranging from 1.4 cm2 for LSM deposited on polished YSZ to 0.06 cm2 for LSM deposited onto BYO backbone at a measured temperature of 650 ºC. This electrodes exhibit high performance even after annealing at 950 ºC making them interesting for applications at intermediate temperatures.es_ES
dc.description.sponsorshipUniversidad de Málaga. Campus de Excelencia Internacional Andalucía Tech.es_ES
dc.language.isoenges_ES
dc.rightsinfo:eu-repo/semantics/openAccesses_ES
dc.subjectPilas de combustiblees_ES
dc.subject.otherFuel cellses_ES
dc.subject.otherLa0.8Sr0.2MnO3-es_ES
dc.subject.otherSpray-pyrolysises_ES
dc.subject.otherMicrostructurees_ES
dc.subject.otherImpedance spectroscopyes_ES
dc.titleNovel microstructural strategies to enhance the electrochemical performance of La0.8Sr0.2MnO3-δ cathodeses_ES
dc.typeinfo:eu-repo/semantics/conferenceObjectes_ES
dc.centroFacultad de Cienciases_ES
dc.relation.eventtitleThe Energy & Materials Research Conference (EMR)es_ES
dc.relation.eventplaceMadrides_ES
dc.relation.eventdate25/02/2015es_ES
dc.identifier.orcidhttp://orcid.org/0000-0002-1377-8351es_ES
dc.cclicenseby-nc-ndes_ES


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