Structure and redox properties of perovskite Y0.9Sr0.1Cr1−xFexO3−δ

The aim of this paper is to examine the feasibility of Y0.9Sr0.1Cr1−xFexO3−δ for potential use as anode materials in solid oxide fuel cells (SOFCs) fed with fuel gas containing H2S, as well as other electrochemical devise. Y0.9Sr0.1Cr1−xFexO3−δ (x = 0.1, 0.3, 0.5) were synthesized by gel combustion method and had single-phase orthorhombic perovskite structure. These materials were all stable in reducing atmosphere (10%, v/v H2/N2) up to 800 °C. By the comparison of the O 1s peaks assigned to Y0.9Sr0.1Cr1−xFexO3−δ before and after reduction in H2/N2, lower content of lattice oxygen and higher content of adsorbed oxygen were observed for Y0.9Sr0.1Cr0.9Fe0.1O3−δ, while others appeared opposite results. This phenomenon suggested that reduced Y0.9Sr0.1Cr0.9Fe0.1O3−δ could capture oxygen when exposure to air, which is essential for anode materials. Moreover, Y0.9Sr0.1Cr0.9Fe0.1O3−δ maintained good chemical stability under H2S-containing atmosphere through XRD and FT-IR analysis. So Y0.9Sr0.1Cr0.9Fe0.1O3−δ was suggested as a promising anode material for SOFCs fed with fuel gas containing H2S.