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5275127 
Journal Article 
Phosphotungstic Acid Modified Expanded PTFE based Nafion Composites 
Pattabiraman, K; Ramya, K 
2011 
Yes 
Journal of New Materials for Electrochemical Systems
ISSN: 1480-2422 
14 
4 
217-222 
English 
WOS:000300074200004 
Composite membranes have been prepared by impregnation of PFSI( perfluorosulphonic acid ionomer) solution (Nafion®) into the expanded polytetrafluoroethylene (EPTFE) matrix. The matrix was modified by Na/Naphthalene treatment and with phosphotungstic acid (PTA). The matrix modifications helped in reducing the contact angle thereby improving the impregnation process by reducing the hydrophobicity of the matrix. The fuel cell made with these composite membranes showed that the performance of PTA modified matrix is comparable to that of Na/ naphthalene modified matrix. Further the performances of matrix modified membranes were higher than that of the as received matrix-composites. PTA treatment offers a simple method of matrix modification to achieve high performance. © J. New Mat. Electrochem. Systems. 
Polymer electrolyte membrane fuel cells; Composite ionomers; expanded PTFE; Phosphotungstic acid; surface modification 
PFAS
• Nafion