IEC 62282-7-2-2021 pdf Fuel cell technologies – Part 7-2: Test methods – Single cell and stack performance tests for solid oxide fuel cells (SOFCs)

3.1.7 cathode gas gas that is supplied to the inlet of the cathode of a single cell/stack assembly unit Note 1 to entry: Oxygen and nitrogen are its main components. 3.1.8 current collector conductive material in a fuel cell that collects electrons from the anode side or conducts electrons to the cathode side 3.1.9 stable state condition of a cell/stack assembly unit at which the unit is stable enough for any controlling parameter and the output voltage or output current of the unit to remain within its tolerance range of variation 3.1.10 theoretical current current when the supplied anode gas or cathode gas is completely consumed in electrochemical reactions divided by the number of cells in a series connection 3.1.11 effective fuel utilization ratio of the actual output current of the cell/stack assembly unit to the theoretical current Note 1 to entry: The effective utilization is the utilization of reactants in the electrochemical reaction due to the actual current. This may be less than the actual or total utilization if there are gas inlet and cross leaks. Note 2 to entry: Causes of less-than-optimal currents include losses due to electronic conduction within the cell/stack assembly, gas leaks and anode gas pass-through. Note 3 to entry: A calculation method of effective fuel utilization is given in Annex B. 3.1.12 effective oxygen utilization ratio of the actual output current of the cell/stack assembly unit to the theoretical current Note 1 to entry: The effective utilization is the utilization of reactants in the electrochemical reaction due to the actual current. This may be less than the actual or total utilization if there are gas inlet and cross leaks. Note 2 to entry: A calculation method of effective oxygen utilization is given in Annex C. 3.1.13 maximum effective fuel utilization highest effective fuel utilization that the unit can operate at, without causing unacceptable degradation