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Figure 2
Structure of the repeat unit of the perfluoro­sulfonic acid (PFSA) used in this work, NafionTM D521, with the equivalent weight (EW) = 1100 (m = 6.6) (taken from NafRef: https://www.sigmaaldrich.com/technical-documents/articles/materials-science/perfluorosulfonic-acid-membranes.html).

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 28| Part 3| May 2021| Pages 834-848
https://doi.org/10.1107/S1600577521001703
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