Solvent and acidification method effects in the performance of new sulfonated copolyimides membranes in PEM-fuel cells

• Published in: Journal of power sources Vol. 151; pp. 63 - 68
• Main Authors: Blázquez, J. Alberto, Iruin, Juan J., Eceolaza, Sorkunde, Marestin, Catherine, Mercier, Régis, Mecerreyes, David, Miguel, Oscar, Vela, Ana, Marcilla, Rebeca
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Lausanne Elsevier B.V 10-10-2005; Elsevier Sequoia; Elsevier
• Subjects: Applied sciences; Chemical Sciences; Energy; Energy. Thermal use of fuels; Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc; Exact sciences and technology; Fuel cell; Fuel cells; Ion-exchange membranes; PEMFC; Polycondensation; Polymers; Sulfonated polyimides; PEMFC; Sulfonated polyimides; Ion-exchange membranes; Polycondensation; Fuel cell; Solvent effect; Polyimide; Acidification; Mechanical properties; Membrane; Ion exchange; Performance; polycondensation; sulfonated polyimides; fuel cell; ion-exchange membranes
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2005.02.082

A series of new sequenced sulfonated naphthalenic polyimides were synthesized containing a flexible aromatic–aliphatic diamine. The obtained membranes present the advantage of being soluble in
N-methyl pyrrolidone (NMP) which is a less toxic solvent than the previously used
m-cresol. In this work, we report on the solvent and acidification method effects on the properties of the membranes such as density, water uptake, proton conductivity as well as on the performance of these membranes in fuel cell operation. The membranes prepared from NMP solution and acidified with ion-exchange resins give the best results. They have good mechanical properties as well as high ionic conductivity (14.4
×
10
−2
S
cm
−1 at 80
°C) and good performances as proton exchange membrane (PEM) in fuel cell at 70
°C.