Abstract
Knowledge of the actual fuel utilization of a fuel cell stack is very important for characterizing the performance of a fuel cell stack. The actual fuel utilization in many cases does not equal the set fuel utilization defined by the electrical current and the fuel gas flow rate due to possible leakages or an inhomogeneous fuel gas distribution to the fuel cell stack layers. This manuscript describes a method for determining the actual fuel utilization of a fuel cell stack or a fuel cell layer by recording the cell voltages at different fuel utilizations.
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