In a diagnostic method for a fuel cell, the amount of cross leak is determined by supplying the anode of the fuel cell with a hydrogen or hydrogen-containing gas, and supplying the cathode with an inert gas or vacuuming the cathode, and measuring the voltage of each cell.

 
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< Sulfonated polyaryletherketone-polyethersulfone block copolymers

> Sulfonic acid group-containing, proton-conducting polymer composition, a solid electrolyte membrane and a solid polymer fuel cell

> Fuel cell bipolar plates with multiple active areas separated by non-conductive frame header
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