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The permeability and stability of Sm0.7Sr0.3CoO3−δ (SSCO) regarding the special requirements for carbon capture and storage (CCS) application were investigated. Pure CO2 was used as the sweep gas at 900 °C, leading to that the oxygen permeation flux decreases by about 34 %. Several cycles of changing the sweep gas between helium and CO2 indicate the good reversibility of this degradation...