Abstract
A Sm0.5Sr0.5CoO3−δ (SSC)–BaZr0.1Ce0.7Y0.2O3−δ (BZCY) composite cathode with multiscale porous structure was successfully fabricated through infiltration for proton-conducting solid oxide fuel cells (SOFCs). The multiscale porous SSC catalyst was coated on the BZCY cathode backbones. Single cells with such composite cathode demonstrated peak power densities of 0.289, 0.383, and 0.491Wcm−2 at 600, 650, 700°C, respectively. Cell polarization resistances were found to be as low as 0.388, 0.162, and 0.064Ωcm2 at 600, 650 and 700°C, respectively. Compared with the infiltrated multiscale porous cathode, cells with screen-printed SSC–BZCY composite cathode showed much higher polarization resistance of 0.912Ωcm2 at 600°C. This work has demonstrated a promising approach in fabricating high performance proton-conducting SOFCs.
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