A stable chromite anode for SOFC with Ce/Ni exsolution for simultaneous electricity generation and CH4 reforming

Sr-Doped PrCrO3 with Intelligent SrCrOx Cocatalyst for the Fuel Electrode of Reversible Solid Oxide Cells

“…The σ values of PS20C and PS30C were 2.06 and 2.14 S cm –1 in 5% H 2 at 800 °C, respectively (Figure b), and their activation energy ( E a ) values are 0.19 and 0.07 eV, which is much smaller than the enthalpy for charge-carrier generation, 1.0 eV. The E a is quite close to that of reduced La 0.8 Ca 0.2 CrO 3 (0.07 eV) . The semiconducting behavior would be ascribed to the (Pr,Sr)­CrO 3−δ phase since SrCrO 3−δ showed a metallicity where σ decreased with temperature.…”

“…The E a is quite close to that of reduced La 0.8 Ca 0.2 CrO 3 (0.07 eV). 35 The semiconducting behavior would be ascribed to the (Pr,Sr)CrO 3−δ phase since SrCrO 3−δ showed a metallicity where σ decreased with temperature.…”

Metal exsolution from perovskite-based anodes in solid oxide fuel cells

“…To date, the in situ exsolution technique has been widely applied to materials such as spinels (such as FeVO 4 ), fluorites (such as CeO 2 , (Ce 0.9 Gd 0.1 ) 1− x Pr x O 2− δ ), hollandite-type oxides (such as NbTi 0.5 Ni 0.5 O 4 ), and perovskites (such as La 0.6 Sr 0.2 Cr 0.85 Ni 0.15 O 3− δ ). 20–25 Among them, perovskite-type oxides (ABO 3 ) and their derivative structures, such as double perovskites (A 2 BB'O 6 or AA'B 2 O 6 ) and Ruddlesden–Popper phases (RP, A n +1 B n O 3 n +1 or (AO)(ABO 3 ) n ), exhibit high structural stability in redox environment and can be easy doped by transition metals (TMs)/rare-earth metal atoms at the B/A sites arising from their soft crystal structure, providing the possibility of the in situ exsolution of the foreign metal atoms from perovskite. 26 Experimental studies have confirmed that several metals can be precipitated from the perovskite lattice, including noble metals such as Pt, Pd, Rh, Ru and Ag, TMs such as Fe, Co, Ni and Cu, and their specific alloys.…”