A Novel Cobalt-Free, CO₂-Stable, and Reduction-Tolerant Dual-Phase Oxygen-Permeable Membrane

Abstract

A novel CO2-stable and reduction-tolerant Ce0.8Sm0.2O(2-δ)-La0.9Sr0.1FeO(3-δ) (SDC-LSF) dense dual-phase oxygen-permeable membrane was designed and evaluated in this work. Homogeneous SDC-LSF composite powders for membrane fabrication were synthesized via a one-pot combustion method. The chemical compatibility and ion interdiffusion behavior between the fluorite phase SDC and perovskite phase LSF during the synthesis process was studied. The oxygen permeation flux through the dense dual-phase composite membranes was evaluated and found to be highly dependent on the volume ratio of SDC and LSF. The SDC-LSF membrane with a volume ratio of 7:3 (SDC70-LSF30) possessed the highest permeation flux, achieving 6.42 × 10(-7) mol·cm(-2)·s(-1) under an air/CO gradient at 900 °C for a 1.1-mm-thick membrane. Especially, the membrane performance showed excellent durability and operated stably without any degradation at 900 °C for 450 h with helium, CO2, or CO as the sweep gas. The present results demonstrate that a SDC70-LSF30 dual-phase membrane is a promising chemically stable device for oxygen production and CO2 capture with sufficiently high oxygen permeation flux.

Oxygen permeation modeling for Zr0.84Y0.16O1.92–La0.8Sr0.2Cr0.5Fe0.5O3− asymmetric membrane made by phase-inversion

“…However, some of the electronic transport phase in the dual-phase membranes shows oxygen ion conductivity [42][43][44]. Properties of these membranes also can be predicted by this model.…”

Perovskite materials in energy storage and conversion

“…Specifically, the preparation of dual‐phase composite membranes have been widely exploited, and they may achieve high oxygen permeability, good chemical stability and, more importantly, high tolerance toward CO 2 simultaneously . Recently, a composite membrane with a reduced amount of perovskite in the membrane was exploited . The fluorite‐type materials were most selected for use in the primary phase because of their stable phase structure and acceptable oxygen ion‐conducting ability.…”

Efficient and CO2-tolerant oxygen transport membranes prepared from high-valence B-site substituted cobalt-free SrFeO3−δ

“…During the past decades, strategies such as applying dual-phase and dual-layer membranes have been proposed to alleviate aforementioned issues [17][18][19][20][21][22]. Several combinations have been proposed, e.g., membranes with external or internal shortcircuiting electrodes, dual-phase membranes comprised of a spinel oxide and an ionic conductor, and dual-layer membranes of SrFe 0.8 Nb 0.2 O 3-δ /Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ or Ce x Gd 1-x O 2-δ /La x Sr 1-x Co y Fe 1-y O 3-δ [23][24][25][26][27][28].…”