Abstract

NJOKU, Chima B.; OMONDI, Bernard  and  NDUNGU, Patrick G.. Physical chemical properties of Ce₀₈Sm₀₂Ir_yCo_1-yO_3-ô (y = 0.03-0.04) and preliminary testing as cathode material for low-temperature SOFC. S.Afr.j.chem. (Online) [online]. 2017, vol.70, pp.171-180. ISSN 1996-840X.  http://dx.doi.org/10.17159/0379-4350/2017/v70a24.

Sol-gel method was used to prepare Ce_a8Sm_a2Ir_yCoj__yO₃__ä (CSIC) (y = 0.03 and 0.04). All materials were characterized using powder X-ray powder diffraction (XRD), Raman spectroscopy, infrared (IR) spectroscopy, high resolution transmission electron microscopy (HRTEM) and scanning electron microscopy (SEM). The materials were then tested as cathodes in solid oxide fuel cell (SOFC). The XRD data showed distinct peaks for samarium-doped ceria and iridium oxide while Raman data confirmed the presence of perovskite and pyrochlore phases. Materials calcined at 1000 °C had the highest power density of 0.287 W cm^-2 and 0.222 W cm^-2 at 500 °C for the materials with y = 0.03 and 0.04, respectively, when tested in SOFC button cells.

Keywords : Solid oxide fuel cell; iridium oxide; samarium-doped ceria; oxides; sol-gel chemistry; Raman spectroscopy; X-ray diffraction; electrochemical properties.

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