EU harmonised polarisation curve test method for low-temperature water electrolysis

The purpose of this generic testing procedure is to characterise the performance of a low-temperature WE cell or stack in terms of polarisation curves at specified operating conditions. The present procedure can be considered generic and useful for testing lowtemperature WE for various applications, whether single cells or stacks. At ambient pressure, the performance is measured from the lowest to the highest current density (ascending part of the polarisation curve), followed by a measurement in reverse order from the highest to the lowest current density (descending part of the polarisation curve), considering the specifications of the manufacturer and the objective of the test. For operation under pressure, the performance is alternatively measured from the highest to the lowest current density (descending part of the polarisation curve), followed by a measurement in reverse order (ascending part of the polarisation curve).