Proton exchange membranes based on the short-side-chain perfluorinated ionomer for high temperature direct methanol fuel cells

Short-side-chain Hyflon® perfluorinated ionomer based membrane was investigated as electrolyte for high temperature direct methanol fuel cells. A fuel cell performance approaching 300 mW cm–2 was achieved at 140°C in the presence of 1 M methanol and air feed. Stable electrochemical performance was achieved indicating suitable perspective for high temperature operation of Hyflon® membrane.

Operation of Hyflon® Ion membfranes at 140°C was demonstrated in a pressurised direct methanol fuel cell (3 bars abs.). Stable electrochemical performance was recorded during cycled operation. This latter is of particular interest for applications as power sources in portable and mobile systems.