Double-perovskites A2FeMoO6− (A= Ca, Sr, Ba) as anodes for solid oxide fuel cells

Carbon and Redox Tolerant Infiltrated Oxide Fuel-Electrodes for Solid Oxide Cells

“…Therefore, another MIEC, the single perovskite strontium iron molybdenum oxide, Sr 0.99 Fe 0.75 Mo 0.25 O 3-δ (here denoted SFM) (4)(5)(6)(7), is infiltrated to serve as an electronic percolating network, as illustrated in Figure 1. The single perovskite is a more redox stable version (7) of the double perovskite, Sr 2 FeMoO 6 (8)(9)(10). High conductivity (200-300 S/cm) and power density have been reported for the latter (8)(9)(10), which is likely brought about by mixed-valences of Fe 2+ /Fe 3+ and Mo 5+ /Mo 6+ (4,11).…”

“…The single perovskite is a more redox stable version (7) of the double perovskite, Sr 2 FeMoO 6 (8)(9)(10). High conductivity (200-300 S/cm) and power density have been reported for the latter (8)(9)(10), which is likely brought about by mixed-valences of Fe 2+ /Fe 3+ and Mo 5+ /Mo 6+ (4,11). One order of magnitude lower conductivity has been reported for the single perovskite (6,(11)(12)(13), but with the added benefit of redox stability.…”

Solid Oxide Fuel Cell Anode Materials for Direct Hydrocarbon Utilization

“…[ 382 ] Ca 2 FeMoO 6 , Sr 2 FeMoO 6 , and Ba 2 FeMoO 6 crystallized in monoclinic, tetragonal, and cubic structures, respectively, of which Sr 2 FeMoO 6 showed the best fuel cell performance with P max of 0.83 and 0.74 W cm − 2 in dry H 2 and commercial city gas at 850 ° C, respectively. [ 385 ] The aliovalent substitution of B and B´ sites of SMMO (Al, [ 387 ] Co, [ 386 , 388 , 389 ] Ni, [ 386 , 389 , 390 ] Fe, [ 386 , 389 , 391 , 392 ] Mn, [ 386 , 389 ] and Zn [ 389 ] substituting Mg; W and Nb [ 393 ] substituting Mo [ 393 ] ) lowers the degree of cation ordering as well as creates oxygen vacancies in the lattice, both of which seem benefi cial to SOFC anode materials. 5% substitution of Mg by Al, i.e.…”

Conductivity and redox stability of new double perovskite oxide Sr1.6K0.4Fe1+x Mo1−x O6−δ (x = 0.2, 0.4, 0.6)

“…Therefore, it is desired to develop new anode, particularly redox stable anode for SOFCs [3][4][5][6][7][8][9][10]. Double perovskite Sr 2 (TM)MoO 6-d (TM = Mn, Mg, Fe, Co, Ni, Cu, Zn) as potential anode materials for SOFCs has been the subject of a substantial body of research [3,5,8,9,11], and good fuel cell performance has been achieved for Sr 2 MgMoO 6-d [5], Sr 2 MnMoO 6-d [5], Sr 2 CoMoO 6-d [12] and Sr 2 FeMoO 6-d [13] anodes; of these compounds, only Sr 2 MgMoO 6-d (SMMO) has been proven to be redox stable [14]. Despite achieving redox stability, the chemical reactivity of SMMO with common electrolytes, such as LSGM and YSZ, limits its utility [6].…”

“…Synthesis of the potassium-doped strontium molybdenum ferrite was noted to improve the formability of these compounds, with the formation of single-phase Sr 1.6 K 0.4 FeMoO 6-d observed after reduction at 850°C in H 2 , 250°C lower than is required for the pure strontium analogue in 5 % H 2 /Ar [13]. The conductivity of these compounds was comparable to that of the pure strontium iron molybdate, despite the lower synthesis temperature.…”