Industrial gas separation, essential for clean energy and environmental protection, demands efficiency and adaptability. Current materials, however, lack the flexibility to selectively separate gases like carbon dioxide (CO₂) and hydrogen (H₂) while remaining energy-efficient. Researchers at the Institute for Integrated Cell-Material Sciences (WPI-iCeMS) at Kyoto University and the Department of Chemical Engineering at National Taiwan University have developed a phase-transformable membrane that could meet these needs.