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Title: Moving beyond mass-based parameters for conductivity analysis of sulfonated polymers

Proton conductivity of polymer electrolytes is critical for fuel cells and has therefore been studied in significant detail. The conductivity of sulfonated polymers has been linked to material characteristics in order to elucidate trends. Mass based measurements based on water uptake and ion exchange capacity are two of the most common material characteristics used to make comparisons between polymer electrolytes, but have significant limitations when correlated to proton conductivity. These limitations arise in part because different polymers can have significantly different densities and conduction happens over length scales more appropriately represented by volume measurements rather than mass. Herein, we establish and review volume related parameters that can be used to compare proton conductivity of different polymer electrolytes. Morphological effects on proton conductivity are also considered. Finally, the impact of these phenomena on designing next generation sulfonated polymers for polymer electrolyte membrane fuel cells is discussed.
Authors:
 [1] ;  [2]
  1. Los Alamos National Laboratory
  2. NREL
Publication Date:
OSTI Identifier:
972059
Report Number(s):
LA-UR-09-06546; LA-UR-09-6546
TRN: US201005%%161
DOE Contract Number:
AC52-06NA25396
Resource Type:
Journal Article
Resource Relation:
Journal Name: Annual Review of Chemical and Biomolecular Engineering
Research Org:
Los Alamos National Laboratory (LANL)
Sponsoring Org:
DOE
Country of Publication:
United States
Language:
English
Subject:
36; CAPACITY; ELECTROLYTES; FUEL CELLS; ION EXCHANGE; MEMBRANES; POLYMERS; PROTONS; WATER