Studies on Perovskite-based electrodes for symmetrical SOFCs

La utilizacion simultanea de un mismo material ceramico como anodo y catodo en pilas de combustible de oxido solido simetricas (SFCs) aporta una serie de beneficios entre los que figura una fabricacion mas sencilla, reduccion de los costes de produccion, asi como resistencia a la formacion de depositos de carbon por craqueo del combustible. Recientemente, cromitas y cromomanganitas han sido propuestos como materiales capaces de adoptar esta novedosa configuracion SOFC y, si bien los resultados obtenidos son prometedores, se requiere de una mayor investigacion para el desarrollo de nuevas composiciones que presenten eficiencias mas elevadas. En el presente trabajo, se evaluan la evolucion de la estructura desde celdas cubicas a ortorrombicas al aumentar el contenido en Fe y las prestaciones del sistema La4Sr8Ti12-xFexO38-� (LSTF) y se compara su respuesta con otros electrodos simetricos, observandose que el rendimiento es hasta un 20% mayor en el caso de emplear electrodos LSTF que en otros sistemas basados en perovskitas.

[1]  J. Canales‐Vázquez,et al.  Performance of cubic-(La,Sr)TiO3+δ as SOFC anodes , 2007 .

[2]  P. Gómez‐Romero,et al.  Fe-substituted (La,Sr)TiO3 as potential electrodes for symmetrical fuel cells (SFCs) , 2007 .

[3]  J. Canales‐Vázquez,et al.  Lanthanum chromite materials as potential symmetrical electrodes for Solid Oxide Fuel Cells , 2007 .

[4]  Michael D. Gross,et al.  Recent progress in SOFC anodes for direct utilization of hydrocarbons , 2007 .

[5]  S. Jiang,et al.  Lanthanum strontium manganese chromite cathode and anode synthesized by gel-casting for solid oxide fuel cells , 2007 .

[6]  S. Jiang,et al.  Synthesis and performance of (La0.75 Sr0.25) 1-x (Cr0.5 Mn0.5) O3 cathode powders of solid oxide fuel cells by gel-casting technique , 2007 .

[7]  Michael D. Gross,et al.  A Strategy for Achieving High-performance with SOFC Ceramic Anodes , 2007 .

[8]  Juan Carlos Ruiz-Morales,et al.  On the simultaneous use of La0.75Sr0.25Cr0.5Mn0.5O3−δ as both anode and cathode material with improved microstructure in solid oxide fuel cells , 2006 .

[9]  C. Louis,et al.  The effect of gold particle size on AuAu bond length and reactivity toward oxygen in supported catalysts , 2006 .

[10]  John T. S. Irvine,et al.  A symmetrical solid oxide fuel cell demonstrating redox stable perovskite electrodes , 2006 .

[11]  John B Goodenough,et al.  Double Perovskites as Anode Materials for Solid-Oxide Fuel Cells , 2006, Science.

[12]  Wuzong Zhou,et al.  Disruption of extended defects in solid oxide fuel cell anodes for methane oxidation , 2006, Nature.

[13]  J. Canales‐Vázquez,et al.  Microstructural optimisation of materials for SOFC applications using PMMA microspheres , 2006 .

[14]  A. Jacobson,et al.  Thermal and chemical expansion properties of La0.2Sr0.8Fe0.55Ti0.45O3−x , 2005 .

[15]  J. Attfield,et al.  Order-disorder octahedral tilting transitions in SrSnO 3 perovskite , 2005 .

[16]  M. Smith,et al.  Studies on the Reorganization of Extended Defects with Increasing n in the Perovskite‐Based La4Srn–4TinO3n+2 Series , 2005 .

[17]  R. Mukundan,et al.  Sulfur Tolerant Anodes for SOFCs , 2004 .

[18]  J. Attfield,et al.  Cation-size control of structural phase transitions in tin perovskites , 2003 .

[19]  John T. S. Irvine,et al.  A redox-stable efficient anode for solid-oxide fuel cells , 2003, Nature materials.

[20]  J. Canales‐Vázquez,et al.  Electrical properties in La2Sr4Ti6O19$minus;$delta;: a potential anode for high temperature fuel cells , 2003 .

[21]  R. Mitchell.  Perovskites: Modern and Ancient , 2003 .

[22]  D. P. Fagg,et al.  Stability and mixed ionic–electronic conductivity of (Sr,La)(Ti,Fe)O3−δ perovskites , 2003 .

[23]  J. Stevenson,et al.  Thermal, Electrical, and Electrocatalytical Properties of Lanthanum-Doped Strontium Titanate , 2002 .

[24]  D. P. Fagg,et al.  Redox behavior and transport properties of La0.5−xSr0.5−xFe0.4Ti0.6O3−δ (0 , 2002 .

[25]  N. Xanthopoulos,et al.  Lanthanum Chromite Based Catalysts for Oxidation of Methane Directly on SOFC Anodes , 2001 .

[26]  Juan Rodríguez-Carvajal,et al.  Recent advances in magnetic structure determination by neutron powder diffraction , 1993 .

[27]  M. Vallet‐Regí,et al.  Brownmillerite-type microdomains in the calcium lanthanum ferrites: CaxLa1−xFeO3−y: I. 23 < x < 1 , 1983 .