Nano-sized Sm0.5Sr0.5CoO3−δ as the cathode for solid oxide fuel cells with proton-conducting electrolytes of BaCe0.8Sm0.2O2.9

Layered SmBaCuCoO5+ and SmBaCuFeO5+ perovskite oxides as cathode materials for proton-conducting SOFCs

“…The interfacial polarization resistance is 1.173 at 600 • C, 0.483 at 650 • C, 0.137 cm 2 at 700 • C for SBCC cathode and 1.300 at 600 • C, 0.550 at 650 • C, 0.196 cm 2 at 700 • C for SBCF cathode, respectively. As compared to the fuel cell with uniform anode and electrolyte but different single phase cathode materials such as Sm 0.5 Sr 0.5 CoO 3−ı [17] and La 0.7 Sr 0.3 FeO 3−ı [18], the interfacial polarization resistances of SBCC and SBCF which are related to the oxygen reduction, oxygen surface/bulk diffusion and the gas-phase oxygen diffusion [19] were lower. The results indicated that the layered SBCC cathode and the SBCF cathode are good candidates for operation at or below 700 • C.…”

Effect of PVA addition on formation of spray-deposited Sm0.5Sr0.5CoO3 thin films on CeO2 substrates

“…There are basically two regions in the Arrhenius plot, which may be due to electronic and ionic charge transport mechanism in the film. The conductivity observed in the sample is very low as compared to previous reports which could be because of non connective grains [6,15]. The percentage variation of polyvinyl alcohol leads to change in the transition temperature of predominance in the conduction from electronic to ionic and tabulated in the Table 1.…”

“…This is due to the high catalytic activity of SSC for the oxygen reduction reaction as well as its excellent ionic and electronic conductivity over the wide range of temperature [1,2,7,19]. However, SSC has a compatible thermal expansion coefficient with ceria-based electrolytes, which possess the higher ionic conductivity at lower temperature [6][7][8][9][10]. The electrical as well as electrochemical properties of SSC are highly sensitive to its microstructure [9,10].…”

A cobalt-free Sm0.5Sr0.5Fe0.8Cu0.2O3−δ–Ce0.8Sm0.2O2−δ composite cathode for proton-conducting solid oxide fuel cells

“…A decrease in the operating temperature from 700 to 500 • C, results in the R p of the single cell increasing from 0.138 to 2.62 cm 2 , while the R ohm only increasing from 0.273 to 0.581 cm 2 . It implies that the interfacial polarization resistance, which is dominated by the cathode-electrolyte interface greatly, has limited the cell performance in low temperature conditions [20]. For example, after the temperature decrease below 600 • C, the power density of single cell with SSFCu-SDC cathode will gradually exceed those with Sm 0.5 Sr 0.5 CoO 3−ı -SDC and Ba 0.5 Sr 0.5 FeO 3−ı -SDC cathodes, when the R p of SSFCu-SDC cathode cell will be gradually exceeded by R p of the later two cells, which increases relatively faster as the temperature decreasing [13,21].…”