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Title: Electrospun Nafion®/Polyphenylsulfone composite membranes for regenerative Hydrogen bromine fuel cells

Here, the regenerative H2/Br2-HBr fuel cell, utilizing an oxidant solution of Br2 in aqueous HBr, shows a number of benefits for grid-scale electricity storage. The membrane-electrode assembly, a key component of a fuel cell, contains a proton-conducting membrane, typically based on the perfluorosulfonic acid (PFSA) ionomer. Unfortunately, the high cost of PFSA membranes and their relatively high bromine crossover are serious drawbacks. Nanofiber composite membranes can overcome these limitations. In this work, composite membranes were prepared from electrospun dual-fiber mats containing Nafion® PFSA ionomer for facile proton transport and an uncharged polymer, polyphenylsulfone (PPSU), for mechanical reinforcement, and swelling control. After electrospinning, Nafion/PPSU mats were converted into composite membranes by softening the PPSU fibers, through exposure to chloroform vapor, thus filling the voids between ionomer nanofibers. It was demonstrated that the relative membrane selectivity, referenced to Nafion® 115, increased with increasing PPSU content, e.g., a selectivity of 11 at 25 vol% of Nafion fibers. H2-Br2 fuel cell power output with a 65 m thick membrane containing 55 vol% Nafion fibers was somewhat better than that of a 150 m Nafion® 115 reference, but its cost advantage due to a four-fold decrease in PFSA content and a lower bromine species crossovermore » make it an attractive candidate for use in H2/Br2-HBr systems.« less
Authors:
 [1] ;  [1] ;  [1] ;  [2] ;  [2]
  1. Vanderbilt Univ., Nashville, TN (United States)
  2. Univ. of Kansas, Lawrence, KS (United States)
Publication Date:
OSTI Identifier:
1257978
Grant/Contract Number:
AR0000262
Type:
Accepted Manuscript
Journal Name:
Materials
Additional Journal Information:
Journal Volume: 9; Journal Issue: 3; Journal ID: ISSN 1996-1944
Publisher:
MDPI
Research Org:
TVN Systems Inc., Lawrence, KS (United States)
Sponsoring Org:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION proton conducting membrane; electrospinning; Nafion; polyphenylsulfone; redox flow battery; regenerative fuel cell; hydrogen fuel cell; bromine