Membrane electrode assembly with compression control gasket

摘要

A method is provided for making a gasketed fuel cell membrane electrode assembly (MEA) comprising the steps of: i) selecting a fluid transport layer sheet material; ii) selecting a target level of compression Ct % for use of said fluid transport layer sheet material in a fuel cell membrane electrode assembly; iii) measuring the pressure Pt for which the fluid transport layer sheet material achieves compression of Ct %; iv) positioning between the platens of a press a membrane electrode assembly comprising: a) a polymer electrolyte membrane; b) an anode catalyst material; c) a cathode catalyst material; d) an anode-side fluid transport layer comprising the selected fluid transport layer sheet material; and e) a cathode-side fluid transport layer comprising the selected fluid transport layer sheet material; v) depositing a gasket material in the outer edge portions of the anode and cathode faces of the polymer electrolyte membrane; vi) compressing the membrane electrode assembly to a pressing pressure Pp which is between 90% and 110% of Pt; and vii) substantially fixing the gasket material so as to form a gasketed fuel cell membrane electrode assembly. An MEA is provided comprising the layers listed above wherein the average thickness of each gasket Tg under its contact face is between 110% and 90% of {Tf×(100%−Ct %)}, where Tf is the average thickness of the respective same-side fluid transport layer.