The subject matter of this invention deals with sulfonated polyphosphazene-based cation-exchange membranes for proton-exchange membrane fuel cells where the polyphosphazene is crosslinked, non-crosslinked, suitably blended with one or more additional polymers, and/or impregnated into the void volume of an inert microporous membrane support and where the membranes operate in a hydrated state that is characterized by a high proton conductance and low water and methanol permeation rates. In particular, the invention relates to the use of poly[bis(3-methylphenoxy)phosphazene] as the base polymer, with sulfonated ion-exchange groups, for direct liquid-feed methanol fuel cells.

A matéria sujeita desta invenção trata de sulfonated as membranas polyphosphazene-baseadas do cation-exchange para proton-troca as células combustíveis da membrana onde o polyphosphazene crosslinked, non-non-crosslinked, é misturado apropriadamente com um ou mais polímero adicional, e/ou impregnado no volume vago de uma sustentação microporous inerte da membrana e onde as membranas se operam em um estado hydrated que seja caracterizado por um conductance elevado do proton e por umas taxas baixas do permeation da água e do metanol. No detalhe, a invenção relaciona-se ao uso de poly[bis(3-methylphenoxy)phosphazene ] como o polímero baixo, com sulfonated os grupos ion-exchange, para direto líquido-alimenta células combustíveis do metanol.

 
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