Development of Robust Mixed‐Conducting Membranes with High Permeability and Stability

Abstract

This chapter presents the current state of the art in the development of mechanically and chemically robust perovskite-based membranes for industrial applications. Without providing an exhaustive picture of all developments in the field, the principal points of interest are discussed and the most recent concepts summarized. Finally, brief guidelines for possible future studies are proposed

Thermochemical stability of LaxSr1-xCoyFe1-yO3-δ and NiFe2O4-Ce0.8Tb0.2O2-δ under real conditions for its application in oxygen transport membranes for oxyfuel combustion

“…CO2 can be explained by the high resistance shown by each of its oxide components alone. In the case of the ionic conductor, it has been reported that the chemical stability of fluorites, and more concretely doped ceria, is very high in the presence of CO2 (especially higher than in the case of perovskites) [39,55,56]. Regarding the electronic conductor, the spinel NiFe2O4, it cannot give rise to Ni or Fe carbonates at the temperatures studied in this work.…”

Mechanical reliability of Ce0.8Gd0.2O2−δ‐FeCo2O4 dual phase membranes synthesized by one‐step solid‐state reaction

“…Ceramic perovskites, such as Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ [15], and La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ [16], are the most popular materials candidates due to their high oxygen permeation fluxes. But practical applications of these singlephase perovskite membranes are limited due to their degradation in atmospheres containing CO 2 and SO 2 [17][18][19][20][21][22][23][24]. Such a stability limitation can be overcome by the development of dual phase membrane materials, which consist of two separate phases responsible for ionic and electronic conduction, respectively [25][26][27][28][29][30][31][32][33].…”

“…25 Aiming toward future scaling-up of dual phase membranes for industrial applications, mechanical behavior and robustness, in addition to chemical performance and stability, are of critical importance to warrant long-term safe operation. 7,20 Only a limited number of reports focused on the mechanical properties of dual phase membranes, [49][50][51][52][53] reporting values for, for example, elastic modulus, hardness, fracture strength, and fracture toughness. The subcritical crack growth behavior of dual phase membranes, though, has not yet been studied.…”