title: A new anode for solid oxide fuel cells with enhanced OCV under methane operation.
abstract: A new SOFC anode material based upon oxygen excess perovskite related phases has been synthesised. The material shows better electrochemical performance than other alternative new anodes and comparable performance to the state-of-art of the electrodes, Ni-YSZ cermets, under pure hydrogen. Furthermore, this material shows an enhanced performance under methane operation with high open circuit voltages, i.e. 1.2-1.4 V at 950 degrees C, without using steam excess. The effect of the anode configuration was tested in one and four layer configurations. The optimised electrode polarisation resistances were just 0.12 ohm cm(2) and 0.36 ohm cm(2), at 950 degrees C, in humidified H(2) and humidified CH(4), respectively. Power densities of 0.5 W cm(-2) and 0.35 W cm(-2) were obtained in the same conditions. A very low anodic overpotential of 100 mV at 1 A cm(-2) was obtained under humidified H(2) at 950 degrees C. Samples were tested for two days in reducing and oxidising conditions, alternating heating and cooling processes from 850 degrees C to 950 degrees C, showing stable electrode performance and open circuit voltages. The results show that the substituted strontium titanates are very promising anode materials for SOFC.
authors.affiliation: School of Chemistry, University of St Andrews, St Andrews, Fife, UK KY16 9ST.
authors.forename: Juan C
authors.initials: JC
authors.lastname: Ruiz-Morales
authors.forename: Jesús
authors.initials: J
authors.lastname: Canales-Vázquez
authors.forename: Cristian
authors.initials: C
authors.lastname: Savaniu
authors.forename: David
authors.initials: D
authors.lastname: Marrero-López
authors.forename: Pedro
authors.initials: P
authors.lastname: Núñez
authors.forename: Wuzong
authors.initials: W
authors.lastname: Zhou
authors.forename: John T S
authors.initials: JT
authors.lastname: Irvine
mesh_terms: D011211:Electric Power Supplies; D004563:Electrochemistry / Q000295:instrumentation* / Q000379:methods; D004566:Electrodes; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008697:Methane / Q000737:chemistry*; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*
chemical_list: D010087:Oxides; D008697:Methane