Effect of A-site deficiency and Ni/Cu ratio on microstructure and electrical performance of strontium titanate-based SOFC anode

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This paper presents the study of the influence of B-site doping (Ni/Cu ratio in the B-site) and A-site deficiency on the microstructural, electrical and electrochemical properties of (La 0.25 Sr 0.25 Ca 0.45 ) y Ti 0.95 Ni 0.05-x Cu x O 3-δ (LSCTNC A- ) solid oxide fuel cell (SOFC) anode material. Doping of La 0.25 Sr 0.25 Ca 0.45 TiO 3-δ (LSCT A- ) with Ni aiming to enhance the electrochemical performance of the anode materials and Cu is added as an interesting co-dopant. It has been demonstrated that the crystallographic parameters and electrical as well as electrochemical properties are influenced by the oxygen partial pressure, A-site deficiency, and the Ni/Cu ratio at the B-site. Doping with Cu modifies the lattice parameters, i.e the bond lengths and angles between atoms. Impedance spectroscopy shows that A-site deficiency and Ni/Cu ratio in the B-site affect significantly the mid-frequency ( R mid ) and low-frequency ( R low ) polarization resistances. Total polarization resistance is dominantly defined by R low . Doping with Cu improved material conductivity only in the case of 10% A-site deficiency. No enhancement in polarization resistance in H 2 /H 2 O system or stability was found when Ni was replaced with Cu.

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