Zr0.92Y0.08O1.92‐La0.6Sr0.4Co0.2Fe0.8O3–δ Asymmetric Dual‐phase Oxygen Transport Membrane for Simultaneously Methane Partial Oxidation and Water Splitting▴

Abstract

AbstractOxygen transport membrane (OTM) allows O2− to transport from oxygen donation side to partial oxidation side without the contact of oxidant and fuel, providing an efficient pathway for the fuel conversion. OTM with high oxygen permeability are crucial for OTM‐involved processes, and the asymmetric dual‐phase OTM is one of the promising materials with desirable oxygen permeability and stability. Herein, we fabricated a Zr0.92Y0.08O1.92‐La0.6Sr0.4Co0.2Fe0.8O3−δ (YSZ‐LSCF) asymmetric dual‐phase OTM for the methane partial oxidation and water splitting. It exhibits highest oxygen permeation flux of 0.151 mL cm−2 min−1 at 900 °C among all membranes due to the fast oxygen diffusion kinetic. In water splitting experiments driven by different reducing atmospheres (CO and CH4), all the membranes are reactive. The YSZ‐LSCF asymmetric dual‐phase membrane reveals a favorable performance for the partial oxidation of methane to syngas with a H2/CO molar ratio close to 2 and simultaneously water splitting to produce hydrogen. The membrane maintains high stability during the experiments, and the clear dual phases, grain boundaries and porous structure are visible. Owing to its desired oxygen permeability and stability, YSZ‐LSCF asymmetric dual‐phase membrane developed in the present study provides an efficient process for the methane partial oxidation and water splitting.