Characterization of novel Ba 2LnMoO 6 (Ln?=?Pr and Nd) double perovskite as the anode material for hydrocarbon-fueled solid oxide fuel cells

摘要

AbstractBa2LnMoO6(Ln?=?Pr and Nd), with a double perovskite structure, has been investigated as an efficient anode material for solid oxide fuel cells (SOFCs) operating under methane fuel. Ba2LnMoO6(Ln?=?Pr and Nd) powders were successfully synthesized by a citric acid ethylene-diamine-tetraacetic acid (CA-EDTA) combustion technique. Ba2LnMoO6(Ln?=?Pr and Nd) was thermally and morphologically stable at high temperature and chemically compatible with the Gd0.2Ce0.8O1.8(GDC) electrolyte. The electrical conductivities of Ba2PrMoO6and Ba2NdMoO6were 348.5 and 146 Scm?1under humidified CH4at 800?°C, respectively. However, Ba2LnMoO6(Ln?=?Pr and Nd) exhibits better catalytic activity for the hydrogen oxidation reaction (HOR) than for the methane oxidation reaction (MOR); this is due to the presence of deposited carbon, which blocks the fuel path during the overall methane oxidation process.Highlights?Ba2LnMoO6(Ln?=?Pr and Nd) reduce in 5%H2/Ar has cubic double perovskite structure.?Ba2PrMoO6exhibits high conductivity of 348.5 Scm?1under wet CH4at 800?°C.?High conductivity under wet CH4is correlated with the carbon deposition.?Activation energy of Ba2PrMoO6and Ba2NdMoO6for H2oxidation is 1.09 and 1.19?eV.]]>