TY - JOUR
AU - Pérez-Herranz, V.
AB - The impedance concept is defined by Ohm's generalized law. Ohm's law requires the fulfilment of 3 conditions in order to be valid: causality, linearity and stability. In general, electrochemical systems are highly nonlinear systems; and therefore, in order to achieve linearity low amplitude perturbations have to be used during EIS measurements. However, small amplitude perturbations lead to low signal-to-noise ratios. Consequently, the quality of an EIS measurement is determined by a trade-off: the perturbation amplitude should be big enough in order to obtain a good signal-to-noise ratio; and at the same time, it should be small enough in order to avoid significant nonlinear effects. The optimum perturbation amplitude corresponds with the maximum perturbation amplitude that ensures a pseudo linear response of the system. In this work, a method for experimentally determining the optimum perturbation amplitude for performing EIS measurements of a given system is presented. The presented method is based on the harmonic analysis of the output signals; and in this work, it was applied to a highly nonlinear system: the cathodic electrode of an alkaline water electrolyser. The presented method allows optimising the perturbation amplitude in both, constant amplitude and frequency dependant amplitude strategies.
TI - Harmonic Analysis Based Method for Perturbation Amplitude Optimization for EIS Measurements
JF - Journal of the Electrochemical Society
DO - 10.1149/2.1451713jes
DA - 2017-10-26
UR - https://www.deepdyve.com/lp/iop-publishing/harmonic-analysis-based-method-for-perturbation-amplitude-optimization-t00F3zBA7h
SP - H918
EP - H924
VL - 164
IS - 13
DP - DeepDyve
ER -