Development and performance of anode material based on A-site deficient Sr2-xFe1.4Ni0.1Mo0.5O6-δ perovskites for solid oxide fuel cells

Abstract Engineering of A-site deficiency in perovskites can be critical for designing new materials with required functional properties. In this article, A-site deficient Sr 2-x Fe 1.4 Ni 0.1 Mo 0.5 O 6-δ (x = 0-0.1, Sr 2-x FNM) perovskites have been synthesized and characterized as anode materials for solid oxide fuel cells. X-ray photoelectron spectroscopy data indicate that Sr deficiency changes valence states of B-site cations. The introduction of A-site deficiency has shown to improve the chemical stability of the as-prepared materials under reducing conditions. With increasing of Sr deficiency, the conductivity in 5% H 2 /Ar increases markedly, reaching a peak value of 26.6 S cm −1 at x = 0.05. While further increasing of x reduces the conductivity by affecting the mobility of electronic charge carriers. The La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 3 electrolyte-supported cell with La 0.6 Sr 0.4 Fe 0.8 Co 0.2 O 3 cathode and Sr 1.95 Fe 1.4 Ni 0.1 Mo 0.5 O 6-δ anode demonstrates a maximum power density of 606 mW cm −2 at 800 °C operating in H 2 . Such designed A-site deficiency perovskite has the potential to be applied as SOFC anode materials.