Identification of the rate-determining step in oxygen transport through La(1−x)SrxFe(1−y)GayO3−δ perovskite membranes

Effects of Bi Substitution on the Cobalt-Free 60wt.%Ce0.9Pr0.1O2−δ-40wt.%Pr0.6Sr0.4Fe1−xBixO3−δ Oxygen Transport Membranes

“…Meanwhile, the element distribution for the feed side and the sweep side of the spent membrane are similar, indicating that there is no element transfer phenomenon in this case. It is different from the previous reports in references [19,40]. On the other hand, we use XRD to further check two sides of the spent membrane.…”

“…As shown in Supplementary Figure S1, the optimal sintering temperature for these 60CPO-40PSF 1−x B x O membranes appears to decline when x ≥ 0.1 and decreases by up to 100 • C at x = 0.20. On the one hand, the reason could be that the melting point of bismuth oxide is lower than the oxide of iron in the parent material, causing a decrease in sintering temperature in molten sintering, and the results are similar to those of Cu doping [19,40]. On the other hand, it can also be explained by the calculation of the reduced average bond energy (ABE) of the system in Section 3.3, which is possibly correlated with the enthalpy of formation.…”

“…To investigate the effects of bismuth substitution on the oxygen permeability of 60CPO-40PSF 1−x B x O OTMs, we tested the oxygen permeability for all the OTMs. We plotted J O2 -T curves (Figure 5) in the temperature range of 800-1000 • C. From Figure 5, we can see that all the oxygen permeability through 60CPO-40PSF 1−x B x O dual-phase OTMs increase with increasing temperature and reach a maximum at 1000 • C under either He or CO 2 atmosphere because there are two main steps of oxygen transport in OTMs, bulk diffusion and surface exchange [40], which are influenced by the oxygen partial pressure difference between the feed side and the sweep side of OTMs, the thickness of OTMs, and the temperature. According to the equations of bulk diffusion and surface exchange [47,48], the number of oxygen vacancies increases with increasing temperature, and thereby, the oxygen diffusion can be enhanced in both ways.…”

Electrical and Optical Properties of La1–xAxFe1–yByO3−δ Perovskite Films (with A = Sr and Ca, and B= Co, Ga, Ti): Toward Interlayers for Optoelectronic Applications

“…It is to be noticed that the X-ray diffraction diagrams confirmed the presence of a perovskite phase. 13,14 However, the CaTi 0.8 Fe 0.2 O 3−δ coating obtained by PLD showed a lower crystallinity degree. Complementary XPS chemical characterization has shown the elemental composition perovskite thin film corresponds to the material of the target during the PLD process.…”

“…20 However, the concentration of electronic hole and also electrical conductivity depend on Sr and Ca ratio on A site o perovskite structure. 13 The nature of cation on A site has also the impact on the mobility of electronic holes through the perovskite structure, 21 then it notes large variation of electrical conductivity between LCFCo5573 and LSFCo5573, as reported in Table 2.…”