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The Chlor-alkali (CA) process is a representative electrolysis system to produce valued chemicals such as chlorine gas and sodium hydroxide. Membrane cell process has been obtaining the largest market shares, because it is free from environmental issues and low chemicals purity. For the CA process, commercially available membrane materials are perfluorinated sulfonic acid ionomers (PFSAs) with high chemical resistance. Unfortunately, there are limited data associated with the relationships between membrane material parameters and CA performances. It prevents the CA membrane development to be difficult. In this study, the influences of PFSA membrane thickness are disclosed, considering their ion transport behaviors, gas evolution capability, and chemical/electrochemical resistances under CA operation conditions.
