In situ exsolved NiFe nanoparticles in Ni-doped Sr 0.9 Ti 0.3 Fe 0.63 Ni 0.07 O 3-δ anode with a three-dimensionally ordered macroporous structure for solid oxide fuel cells fueled by alkanes

In this work, A -site deficient Ni-doped Sr 0.9 Ti 0.3 Fe 0.63 Ni 0.07 O 3- delta perovskite anode with ordered macroporous structures (STFN-3DOM) is designed to facilitate in -situ Ni-Fe exsolution for solid oxide fuel cells fueled by alkanes, e.g., methane and propane. The large specific surface area and A -site deficient of STFN-3DOM provide more exsolved Ni-Fe active sites and enhance the reaction kinetics of alkane reforming. Quasi -in -situ XPS is used to reveal the changes in the chemical state of elements during the exsolution and propane reforming process on the STFN-3DOM surface. The synergistic effect of A -site deficient, three-dimensional ordered macroporous structure, and in -situ Ni-Fe exsolution promotes the La 0.8 Sr 0.2 Ga 0.83 Mg 0.17 O 3- delta (LSGM) electrolyte -supported SOFC single cell to deliver advanced performance with both wet H 2 (1.33 W cm -2 ) and wet C 3 H 8 (0.838 W cm -2 ) at 850 degrees C, exhibiting satisfactory long-time stability in CH 4 and redox stability. Density functional theory calculation confirms the low activation energy of STFN-3DOM for the rate -limiting step of C 3 H 8 * dissociation.