Physical chemical properties of Ce08Sm02IryCo1-yO3-ô (y = 0.03-0.04) and preliminary testing as cathode material for low-temperature SOFC

Abstract

Sol-gel method was used to prepare Ce 0.8 Sm 0.2 Ir y Co 1-y O 3-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. KEYWORDSSolid oxide fuel cell, iridium oxide, samarium-doped ceria, oxides, sol-gel chemistry, Raman spectroscopy, X-ray diffraction, electrochemical properties. Experimental Methods Material SynthesisCobalt (II) acetylacetonate hydrate, (99 % purity), samarium (III) acetylacetonate hydrate (99.9 %), cerium (III) acetylacetonate hydrate, (99.9 % purity), and pluronic F-127 were purchased from Sigma-Aldrich (Pty) Ltd, South Africa. Iridium (III) acetylacetonate hydrate (98 % purity) was purchased from Alfa

Ce0.8Sr0.2CoxFe1‐xO3‐δ (x=0.2, 0.5, 0.8) – A Perovskite‐type Nanocomposite for Application in the Oxygen Evolution Reaction in Alkaline Media

“…The mean crystallite sizes (D) of the perovskite-type nanocomposites were calculated by employing Scherer's equation (Eq. 1) [46,47],…”

Sol-gel Synthesis of Ce0.8Sr0.2Co1-(x+y)NixFeyO3-δ (x = 0.1, 0.2, and y = 0.2, 0.5, 0.7)—a Nanocomposite-Type Electrocatalyst for the Oxygen Evolution Reaction in Alkaline Media

“…The starting materials employed in the synthesis of CSCNFn [38,39]. These metal salts were all mixed with 20 mL of Milli-Q water and stirred for 10 min, after which it was added dropwise to a 50-mL solution of ethanol and Pluronic F-127 (4.00 g) and stirred employing a magnetic stirrer at 180 rpm, under ambient conditions.…”

“…The tube was fixed while the sample was rotated at 2°m in −1 and the detector at 2°min −1 . Mean crystallite sizes "D" were determined according to the Scherer equation [39]:…”