Novel architectured metal-supported solid oxide fuel cells with Mo-doped SrFeO3−δ electrocatalysts

• Metal-supported fuel cells are based upon porous 430L |dense YSZ| porous YSZ structures.
• Nominal SrFe0.75Mo0.25O3−δ oxides are impregnated as symmetrical catalysts.
• Promising power densities of 0.74 W cm−2 are obtained at 800 °C.

Barriers to technological advancement of metal-supported SOFCs include nickel coarsening in the anode, metallic interdiffusion between the anode and the metal substrate, as well as poor cathode adhesion. Here we report a robust and novel architectured metal-supported SOFC that consists of a thin dense yttria-stabilized zirconia (YSZ) electrolyte layer sandwiched between a porous 430L stainless steel substrate and a porous YSZ thin layer. The key feature is simultaneous use of impregnated nano-scale SrFe0.75Mo0.25O3−δ coatings on the internal surfaces of the porous 430L and YSZ backbones respectively as the anode and cathode catalyst. Such a fuel cell exhibits power densities of 0.74 W cm−2 at 800 °C and 0.40 W cm−2 at 700 °C when operating on hydrogen fuels and air oxidants.