Abstract
Perovskite oxides with variable oxygen non-stoichiometry play a prominent role in many fields, including fuel cells, catalysis and gas storage. One interesting class of materials for solid oxide fuel cells (SOFCs) are cation ordered layered perovskite oxides due to their mixed ionic and electronic conductivity and fast oxygen kinetics. Even though progress has been made in cathode materials to lower the cathodic polarization, still it is also important for fuel cell technology to achieve efficient anode that meets the requirements for long term stability with enhanced tolerance to carbon buildup (coking) and sulfur contamination (poisoning) from hydrocarbon fuels. Here, we report identification of cation ordered layered perovskite oxide, PrBaMn2O5+δ redox-stable anode, with superior electrochemical performance in both hydrogen and hydrocarbons. Cation ordered PrBaMn2O5+δ are fabricated by the in-situ annealing of disordered Pr0.5Ba0.5MnO3-δ in reducing atmosphere directly from the fuel cell support. Our anode material shows high electrical conductivity of 8.16 S cm-1 in 5% H2 at 800 oC and demonstrates a peak power density ~1.3 Wcm-2 at 850 oC using propane as fuel.
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