Infiltrated multiscale porous cathode for proton-conducting solid oxide fuel cells

► Multiscale porous SSC cathode for proton-conducting SOFCs has been fabricated. ► Cells with multiscale porous SSC cathode demonstrated 0.454 W cm−2 at 700 °C. ► Multiscale porous SSC cathode showed polarization resistance of 0.064 Ω cm2 at 700 °C. ► Polarization resistance with multiscale porous SSC cathode did not increase with time.