A composite membrane for use in a fuel cell membrane electrode assembly comprises a porous polymeric substrate and an impregnant partially filling the substrate such that the substrate comprises a first region having pores substantially filled with the imp...

The performance of a direct feed fuel cell such as, for example, a direct methanol fuel cell, with an anode having a CO-tolerant catalyst, such as a Pt-Ru catalyst, is improved by periodically reducing the output power of the cell to be less than the norma...

Improved expanded graphite fluid flow field plates comprise an expanded graphite material having a desired area weight, abbreviated as A and typically expressed in units of g/cm 2 . The methods for making the plates comprise forming at least one flow chann...

An improved method of making a membrane electrode assembly ("MEA") for an electrochemical fuel cell is provided, which MEA comprises coextensive ion exchange membrane and electrode layers and a resilient fluid impermeable integral seal comprising a sealant...

An electrochemical fuel cell is provided for converting a fuel reactant stream and an oxidant reactant stream to a reaction product and electrical energy. The fuel cell comprises a membrane electrode assembly comprising a first electrode layer and a second...

A fuel cell assembly has an improved gas sensor. The improved sensor measures the gas concentrations in the interior fluid passages within a fuel cell assembly or within fluid passages employed to transport reactant fluid streams to or from the fuel cell(s...