SmBaMn 2 O 5+δ (SBMO), a novel layered perovskite compound with samarium based material (Sm +3) as rare earth doped in A-site was synthesized and processed by using dry chemistry method (solid state solution). Structural characterization of SBMO has been investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). While, thermal and electrochemical testing were done by using thermogravimetric analysis (TGA) and current voltage measurements. The Rietveld analysis of XRD data shows that SBMO was crystallized in the orthorhombic structure with the Pmmm space group. The surface morphology images showed a porous structure which indicates that this material can be used as a potential electrode in solid oxide fuel cells (SOFCs). TGA result showed the mass loss of 0.022% for SmBaMn 2 O 5+δ which is very small and indicates that the material is very stable. DC conductivity and performance test were done at RT in air atmosphere. The performance tests have done at 800 °C and 750 °C and the maximum power density was found to be 0.4 W/cm 2 at 800 o C.

Single phase La 0.75 Sr 0.25 Mn 0.5 Cr 0.5-x Ti x O 3-δ (LSCMT, 0 ≤ x ≤ 0.3) perovskites were investigated as possible anode material for solid oxide fuel cells with yttria stabilized zirconia (YSZ) electrolyte. LSCMT samples were synthesized by solid state reaction method and sintered at 1500°C in air. Rietveld refinement of X-ray powder diffraction data show that the LSCMT materials crystallize in the rhombohedral symmetry with R3C space group. The cell parameters of the sample with 10 at.% of Ti (x = 0.1) were: a = b = 5.5125(4) Å; c = 13.3397(6) Å; α = 90°; β = 90°; γ = 120°. The scanning electron microscopy analyses confirmed the presence of sufficient porosity (about 35%). Symmetrical LSCMT|YSZ|LSCMT cell configurations with different Ti-doping (x = 0.1, 0.2 and 0.3) and good interface without delamination between the two materials, even after reduction process, were also prepared. Ti doping was very effective in reducing the interfacial polarization resistance with the lowest value of 0.22Ω·cm 2 and conductivity of 0.23 S/cm in 5% H 2 /Ar at 800°C. The obtained results suggest that Ti doping can substantially improve electrochemical performance of (La 0.75 Sr 0.25 )(Mn 0.5 Cr 0.5 )O 3-δ ceramics.

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