Abstract
The electrical transport properties of hydrohalogenic acid in a Nafion 117 perfluorosulfonic membrane are studied. The conductivity of the membrane material is determined by ac impedance measurements. In membranes previously equilibrated with aqueous solutions, the swelling is modified and the amount of sorbed acid species is evaluated. For higher swelling, the presence of sorbed HF does not affect the membrane conductivity, whereas the presence of HCl and HBr increases it strongly when the fraction of sorbed acid molecules over fixed sulfonic groups is less than 5% for HCl and 20% for HBr. For larger amounts of sorbed HC1 and HBr, the membrane conductivity remains constant. Radiotracer flux measurement of chloride ions shows that the transport number of this anion does not exceed 0.02. These results suggest that the superselectivity of this membrane to protons has two distinct origins: a reduced dissociation of sorbed acid in the membrane phase and an increase of the proton mobility resulting from the sorption of acid.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
