Electrochemical properties and durability of in-situ composite cathodes with SmBa0.5Sr0.5Co2O5+δ for metal supported solid oxide fuel cells

Abstract

The electrochemical properties and long-term performance of an in-situ composite cathode comprised of SmBa0.5Sr0.5Co2O5+δ (SBSCO) and Ce0.9Gd0.1O2-δ (CGO91) are These results suggest that the optimum temperature for in-situ firing of an SBSCO:50 cathode sample of MS-SOFC is higher than 700 o C, ideally around 750 o C.3

Pr- and Sm-Substituted Layered Perovskite Oxide Systems for IT-SOFC Cathodes

“…As was confirmed in Figure 3a, all compositions of Pr x Sm 1−x Ba 0.5 Sr 0.5 Co 2 O 5+d (x = 0.0-0.9) showed typical metallic conductivity behavior in which the conductivity decreased with an increasing temperature, similar to results reported for SBSCO and SNBSCO in the existing literature [7][8][9][10]20].…”

“…Upon comparison of the previous results described above and the results summarized in Figure 1, it can be seen that all the XRD peaks were split in the case of Pr 0.3 Sm 0.7 Ba 0.5 Sr 0.5 Co 2 O 5+d (PSBSCO37) and Pr 0.1 Sm 0.9 Ba 0.5 Sr 0.5 Co 2 O 5+d (PSBSCO19). This showed the same phenomenon as the split XRD patterns of SBSCO, SmBaCo 2 O 5+d (SBCO), GdBaCo 2 O 5+d (GBCO), and GdBa 0.5 Sr 0.5 Co 2 O 5+d (GBSCO), which were reported as orthorhombic crystalline structures [7][8][9][11][12][13][14]. From Figure 1, when the specific peaks of PrxSm1-xBa0.5Sr0.5Co2O5+d oxide systems measured at about 23, 33, 41, 47, 59, 69, and 78 o were compared with those of SBSCO, these XRD patterns corresponded to the same peaks of SBSCO, implying that these oxide systems were synthesized as a layered perovskite crystal structure [7,8].…”

“…Upon comparison of the previous results described above and the results summarized in Figure 1, it can be seen that all the XRD peaks were split in the case of Pr0.3Sm0.7Ba0.5Sr0.5Co2O5+d (PSBSCO37) and Pr0.1Sm0.9Ba0.5Sr0.5Co2O5+d (PSBSCO19). This showed the same phenomenon as the split XRD patterns of SBSCO, SmBaCo2O5+d (SBCO), GdBaCo2O5+d (GBCO), and GdBa0.5Sr0.5Co2O5+d (GBSCO), which were reported as orthorhombic crystalline structures [7][8][9][11][12][13][14].…”

“…An XRD measurement system was operated at 45 kW and 200 mA. The data were collected from 2θ = 10 to 90 • and the obtained data were matched with reference data for the identification of crystal structures [7][8][9][10].…”

“…Based on these studies, our group synthesized SmBa 0.5 Sr 0.5 Co 2 O 5+d (SBSCO) using a cathode mixed with Ce 0.9 Gd 0.1 O 2 (CGO91) and SBSCO at a mass ratio of 1:1; a cathode material with an ASR of 0.019 Ω cm 2 at a temperature of 700 • C was developed [7][8][9]. In addition, from the composition of Sm 1−x Nd x Ba 0.5 Sr 0.5 Co 2 O 5+d (x = 0.1-0.9) that our group recently reported, the crystalline structure was confirmed through the ionic radius substituted at the A / -site in the chemical composition of the layered perovskite oxide system A / A // A /// B 2 O 5+d (A / : Lanthanide, A // : Ba and A /// : Sr).…”