Preparation of Solid Alkaline Fuel Cell Binders Based on Fluorinated Poly(diallyldimethylammonium chloride)s [Poly(DADMAC)] or Poly(chlorotrifluoroethylene-co-DADMAC) Copolymers

Valade, David, Boschet, Frédéric, Roualdès, Stéphanie and Ameduri, Bruno (2009) Preparation of Solid Alkaline Fuel Cell Binders Based on Fluorinated Poly(diallyldimethylammonium chloride)s [Poly(DADMAC)] or Poly(chlorotrifluoroethylene-co-DADMAC) Copolymers. Journal of Polymer Science Part A - Polymer Chemistry, 47 8: 2043-2058. doi:10.1002/pola.23290


Author Valade, David
Boschet, Frédéric
Roualdès, Stéphanie
Ameduri, Bruno
Title Preparation of Solid Alkaline Fuel Cell Binders Based on Fluorinated Poly(diallyldimethylammonium chloride)s [Poly(DADMAC)] or Poly(chlorotrifluoroethylene-co-DADMAC) Copolymers
Journal name Journal of Polymer Science Part A - Polymer Chemistry   Check publisher's open access policy
ISSN 0887-624X
1099-0518
Publication date 2009-04-01
Sub-type Article (original research)
DOI 10.1002/pola.23290
Volume 47
Issue 8
Start page 2043
End page 2058
Total pages 16
Place of publication Hoboken, NJ, United States
Publisher John Wiley & Sons
Language eng
Abstract A membrane or an electrode binder to be used in a solid alkaline fuel cell (SAFC) needs to (i) be insoluble in both aqueous solutions and the required fuels, and (ii) exhibit an hydroxide ion conductivity. To achieve these goals, two pathways were employed: (i) one consists of the radical copolymerization of diallyldimethylam-monium chloride (DADMAC) with chlorotrifluoroethylene (CTFE) while (ii) the other one is based on the counter-ion exchange of a poly(DADMAC) by fluorinated anions. First, the radical copolymerization of CTFE with DADMAC under various experimental conditions was achieved in yields up to 85%, and DADMAC percentages in the copolymers were higher than those in the feed compositions. To obtain insoluble copolymers, high CTFE feed contents (>70 mol %) were required. The other route consisting in the partial replacement of the Cl- counter-ions in the water-soluble poly(DADMAC) by bistrifluoromethanesulfonimide (TFSI-) did confer the starting material insolubility in water while maintaining its conductivity. When the fluorinated poly(DADMAC) was obtained from concentrated solutions of fluorinated surfactant, it was observed that the amount of counter-ions exchanged was difficult to control, which limits optimization. Nevertheless, under diluted conditions, membranes with ion exchange capacity up to 0.7 meq g-1, and conductivities close to 1 mS cm-1 were obtained. Although their conductivities were low, these membranes fulfill the requirements for a SAFC membrane in terms of solubility in DMSO, water insolubility, and thermal stability (Td 10% > 320 °C). When used in a fuel cell, as a binder in the membrane-electrode assembly (MEA), significant improvements were noted (+50% of the open circuit voltage, +580% in current density, and +540% in accessible power).
Keyword chlorotrifluoroethylene
diallyldimethylammonium chloride
electrochemical properties
fluoropolymer
membrane
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Australian Institute for Bioengineering and Nanotechnology Publications
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 35 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 37 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Wed, 09 Mar 2011, 23:49:11 EST