Cobalt-free perovskite Ln0.5Sr0.5Fe0.8Cu0.2O3-δ (Ln = Pr, Nd, Sm, and Gd) as cathode for intermediate-temperature solid oxide fuel cell

Recent advances, practical challenges, and perspectives of intermediate temperature solid oxide fuel cell cathodes

“…58 However, the main advantage of this family is their high resistance to Cr poisoning and good polarization performance stability compared to conventional LSM and LSCF cathodes. 73 Cu-doped compositions such as La 0.6 Sr 0.4 Co 1− y Cu y O 3− δ , 60 La 1− y Sr y Mn 1− x Cu x O 3− δ , 61,64 and La x Sr 1− x Fe 1− y Cu y O 3− δ 62,63,65,66,74 have been investigated. Specifically, Co-free compositions with Cu have attracted much attention due to the decreased cost and TEC and sufficient catalytic activity.…”

“…Specifically, Co-free compositions with Cu have attracted much attention due to the decreased cost and TEC and sufficient catalytic activity. 31,62,74,75 The Co-free composition of La 0.7 Sr 0.3 Ti 0.1 Fe 0.6 Ni 0.3 O 3− δ was prepared using Ni and Ti as B-site dopants demonstrating high electrical conductivity (318 S cm −1 at 700 °C), low polarization resistance and good stability in both oxidizing and reducing environments, which are desirable for application in symmetrical SOFCs. 68 Using Ni and Fe in B-sites and La in A-sites, TEC value decreased to 11.4 × 10 −6 K −1 in LaNi 0.6 Fe 0.4 O 3 in the temperature range of 30–1000 °C and an electrical conductivity of 580 S cm −1 at 800 °C was achieved.…”

“…By replacing La with other lanthanides including Pr, 70,74,76–79 Nd, 70,74,76,79–82 Sm 74,76,79,83–89 and Gd, 74,76,77,79 a variety of perovskite compositions can be generated in which the A site is occupied partly by a Ln element together with Sr or Ca, and the B site is occupied with transition metals such as Co, Fe, Mn, Cu and Mo. In the lanthanide family, the ionic size decreases moving from La to Pr, Nd, Sm and Gd leading to a lower ionicity of Ln–O bonds.…”

“…122 Table 2 summarizes the properties of different LSCF compositions along with other perovskite-type SOFC cathodes. 15,28,59,61–72,74,76–78,80–82,84,86,92–97,99–104,106–108,122,124,125,127,129–131,136–143…”

Evaluation of Nd0.8−xSr0.2CaxCoO3−δ(x = 0, 0.05, 0.1, 0.15, 0.2) as a cathode material for intermediate-temperature solid oxide fuel cells

“…10,11 NdCoO 3− δ exhibits lower electrical conductivity and thermal expansion properties. 12,13 Compared with La, Nd has a smaller ionic radius, shorter Nd–O bond, lower electrical conductivity, and better thermal stability. 14,15 Although the CTE of NdCoO 3− δ is already lower than that of LaCoO 3− δ , this property must be further reduced to the level in electrolytes.…”