Spatially Resolved Voltage, Current and Electrochemical Impedance Spectroscopy Measurements

In this work a 50-channel characterisation system for PEMFCs is presented. The system is capable of traditional electrochemical measurements (e. g. staircase voltammetry, chronoamperometry and cyclic voltammetry), and concurrent EIS measurements. Unlike previous implementations, this system relies on dedicated potentiostats for current and voltage control, and independent frequency response analysers (FRAs) at each channel. Segmented fuel cell hardware is used to illustrate the system's flexibility and capabilities. The results here include steady-state data for cell characterisation under galvanostatic and potentiostatic control as well as spatially resolved impedance spectra.