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Proceedings of Symposium on Energy Engineering in the 21<sup>st</sup> Century (SEE2000) Volume I-IV

ISSN:
1-56700-132-7 (Print)

DEVELOPMENT OF PROTON CONDUCTING MEMBRANES FOR HIGH TEMPERATURE DIRECT METHANOL FUEL CELLS

S. N. Lvov
Department of Energy and Geo-Environmental Engineering, The Energy Institute The Pennsylvania State University

X. Y. Zhou
The Energy Institute, The Pennsylvania State University

L. Benning
The Energy Institute, The Pennsylvania State University

X. J. Wei
The Energy Institute, The Pennsylvania State University

M. V. Fedkin
The Energy Institute, The Pennsylvania State University

H. R. Allcock
Department of Chemistry The Pennsylvania State University

M. A. Hofmann
Department of Chemistry The Pennsylvania State University

A. M. Cannon
Department of Chemistry The Pennsylvania State University

E. C. Kellam
Department of Chemistry The Pennsylvania State University

R. V. Morford
Department of Chemistry The Pennsylvania State University

Abstract

Recent development of direct methanol fuel cells operating at elevated temperatures are reviewed emphasizing research on membranes which are suitable for high temperature conditions. Current research on this topic in our laboratory is also described. The most important result is the development of a family of proton conducting membranes based on polyphosphazane polymers. Experimental work has been conducted to characterize these membranes, in particularly, in terms of conductivity and methanol crossover. It was found that polyphosphazane membranes can have much smaller methanol cross-over than Nafion 117.