High temperature fuel cell system operating method, involves feeding fuel and oxidizer to fuel cell, and controlling cell voltage at fuel cell such that cell voltage always lies above anode material oxidization voltage

摘要

The method involves feeding fuel and oxidizer to a fuel cell (14) with an anode (18) and a cathode (16), and controlling a cell voltage (U) at the fuel cell such that the cell voltage always lies above an anode material oxidization voltage. Temperature (T) at the fuel cell is measured, and a load current (I) of a fuel cell system is measured. Supply pressure (P) of the oxidizer is measured and/or set. The cell voltage and the pressure supply of the oxidizer are controlled as a function of the temperature. The oxidizer supply is controlled as a function of temperature at the fuel cell. An independent claim is also included for a high temperature fuel cell system comprising a fuel cell stack.