Study on Sm1.8Ce0.2CuO4–Ce0.9Gd0.1O1.95 composite cathode materials for intermediate temperature solid oxide fuel cell

Abstract

Sm1.8Ce0.2CuO4-xCe0.9Gd0.1O1.95 (SCC-xCGO, x = 0-12 vol.%) composite cathodes supported on Ce0.9Gd0.1O1.95 (CGO) electrolyte are studied for applications in IT-SOFCs. Results show that Sm1.8Ce0.2CuO4 material is chemically compatible with Ce0.9Gd0.1O1.95 at 1000 °C. The composite electrode exhibits optimum microstructure and forms good contact with the electrolyte after sintering at 1000 °C for 4 h. The polarization resistance (Rp) reduces to the minimum value of 0.17 Ω cm 2 at 750 °C in air for SCC-CGO06 composite cathode. The relationship between Rp and oxygen partial pressure indicates that the reaction rate-limiting step is the surface diffusion of the dissociative adsorbed oxygen on the composite cathode. K Ke ey yw wo or rd ds s: : Solid oxide fuel cell (SOFC); composite cathode; Oxygen reduction reaction (ORR)

Advances in Cathode Materials for Solid Oxide Fuel Cells: Complex Oxides without Alkaline Earth Metal Elements

“…[ 342 ] In another case, a Sm 1.8 Ce 0.2 CuO 4 -Ce 0.9 Gd 0.1 O 1.95 composite cathode materials was prepared and an enhanced electrode performance was also observed as compared with the performance of a pure Sm 1.8 Ce 0.2 CuO 4 electrode. [ 343 ] It seemed that improving ionic conductivity of the Sm 1.8 Ce 0.2 CuO 4 electrode could promote its activity for ORR. However, the main drawback of Nd 2 CuO 4 and Sm 2 CuO 4 materials for application in SOFCs was their low electrical conductivities (less than 1 S cm −1 ) at working temperature.…”

Study of oxygen reduction mechanism on Ag modified Sm1.8Ce0.2CuO4 cathode for solid oxide fuel cell

“…We studied the electrochemical performance of Sm 2−x Ce x CuO 4 and the ASR of Sm 1.8 Ce 0.2 CuO 4 was found to be 1.16 Ω cm 2 at 700 °C [17]. Further research on the oxygen reduction kinetics of these cuprate cathodes always found that the charge transfer reaction was the rate limiting step [16], [17], [18], [19] and [20]. Thus, enhancing the oxygen reduction activity of these cathode materials is crucial for the development of novel IT-SOFC cathode.…”

Evaluation of La0.6Sr0.4CoO3-δ-Ce0.85Sm0.075Nd0.075O2-δ composite cathodes for intermediate temperature solid oxide fuel cells

“…Many cobalt-containing perovskite oxides (like Sm0.5Sr0.5CoO3-δ [6][7][8], La1-xSrxCoO3-δ [9][10][11][12][13][14], La1-xSrxCo1-yFeyO3-δ [15,16], Ba1-xSrxCo1-yFeyO3-δ [17][18][19]) have been developed as cathode materials for intermediate temperature range (500-700 ℃), which demonstrate that excellent ionic and electronic conductivities extend the triple-phase boundary (TPB) region from the cathodeelectrolyte interface into the bulk of the cathode. The powders of these cathode materials are made typically by sol-gel [20][21][22], solid state [23][24][25], combustion [26][27][28], acetic-acrylic [5,29,30], citric acid-EDTA [4,9,10,16,31], solid-liquid [32][33][34][35] etc.…”