Abatement of CO 2 emissions from existing fossil-fueled power plants is currently the sole near-term solution to stabilize CO 2 concentration in the atmosphere. Separation and capture of CO 2 from process streams of these power plants is the first step toward this effort. In this paper, we report a high flux membrane consisting of highly and efficiently interconnected three-dimensional ionic channels prepared from a combined ''co-precipitation'' and ''sacrificial-template'' synthesis. The membranes exhibit remarkable CO 2 permeation characteristic, achieving a CO 2 flux density two orders of magnitude higher than other similar systems reported in the literature. The experimental results also have an excellent agreement with the theoretical predictions. Overall, the demonstrated dual-phase membranes show a great promise for selective pre-combustion CO 2 separation.

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Porous ceramics are a technologically important branch of functional materials for a variety of physical and chemical systems. The properties of porous ceramics depend critically on porosity, pore morphology, pore size, and distribution. In this study, we demonstrate the synthesis of a homogeneously porous samarium‐doped cerium (Ce0.8Sm0.2O1.9, SDC) matrix with tunable porosity and pore size via sacrificial template method. The study explicitly shows that the porosity and pore size of the resultant porous matrix can be controlled by the volume fraction of sacrificial material NiO and sintering temperature, along with the mono‐mode pore distribution produced by molecular‐level mixing of co‐precipitating SDC and NiO. The demonstrated sacrificial template methodology provides an alternative means of tailoring properties of a porous ceramic for particular applications in catalysis, fuel cells, and gas separation membranes.

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