In Situ Exsolved CoFe Alloy Nanoparticles on Gd2SrCo0.8Fe1.2O7−δ for Direct Hydrocarbon Fuel Solid Oxide Fuel Cells

A Ni-free solid oxide fuel cell (SOFC) ceramic anode composed of CoFe alloy (CFA) nanoparticles evenly dispersed in porous Ruddlesden–Popper-type layered oxide Gd2SrCo0.8Fe1.2O7−δ (RP-GSCF) has been fabricated by an in situ reduction method. The RP-GSCF-CFA anode demonstrates good catalytic activity toward H2 and hydrocarbon fuels. The La0.8Sr0.2Ga0.83Mg0.17O3−δ (LSGM) electrolyte-supported single cell with RP-GSCF-CFA as the anode and La0.6Sr0.4Co0.2Fe0.8O3−δ (LSCF) as the cathode deliver a maximum power density of 0.45 and 0.34 W cm–2 in humidified H2 and CH4 at 800 °C, respectively. Moreover, the RP-GSCF-CFA anode demonstrates good stability in wet CH4 for over 72 h, indicating good coking resistance.