Electrochemical impedance spectroscopy (EIS) is a widely used diagnostic technique in electrochemical systems and involves the perturbation of the operating state using a sinusoidal current/voltage and recording the amplitude and phase of the corresponding voltage/current response. The perturbation signal frequencies range from around 0.1 Hz to 10 kHz such that processes acting over a wide range of timescales can be explored , though the measurements must be carried out sequentially and thus EIS has a time period of several minutes for measurement. Recently, we combined all the testing frequencies into a single multifrequency signal via summation to solve the long measurement time problem associated with EIS .