Diagnostic method for determining a state of a fuel cell stack and fuel cell system

摘要

The invention relates to a diagnostic method for determining a state of a fuel cell stack (10) having at least one fuel cell, wherein the fuel cell has a half cell with a catalytic electrode having an active surface (APt) arranged in an electrode space (13), an electrochemical electrode being attached to the electrode Formed double layer (16) with a double-layer capacitance (Ci), and a fuel cell system (100) designed to perform such. It is provided that the state determination comprises the determination of a ratio (Ci / APt) measurement of double-layer capacitance (Ci) to active surface (APt).