A new anode for solid oxide fuel cells with enhanced OCV under methane operation,

Juan Carlos Ruiz-Morales, Jesus Canales Vazquez, Cristian Daniel Savaniu, D. Marrero-Lopez, P. Nunez, Wuzong Zhou, John Thomas Sirr Irvine

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

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 Omega cm(2) and 0.36 Omega cm(2), at 950 degrees C, in humidified H-2 and humidified CH4, 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.

Original languageEnglish
Pages (from-to)1821-1830
Number of pages10
JournalPhysical Chemistry Chemical Physics
Volume9
DOIs
Publication statusPublished - 2007

Keywords

  • EXTENDED DEFECTS
  • OXIDATION
  • TEMPERATURE
  • HYDROCARBONS
  • SOFCS
  • GAS

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