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Electrochemical Low-Frequency Impedance Spectroscopy Algorithm for Diagnostics of PEM Fuel Cell Degradation

Prognostics and health management for fuel cells in real-world applications are important for optimisation of lifetime and operation. A parameter that has been shown to indicate the state of ageing is the low-frequency intercept with the real axis of the Nyquist diagram in a fuel cell’s impedance spectrum. This article presents a method for direct identification of this parameter, without the need to carry out a full electrochemical impedance spectroscopy, and with an algorithm that can be realised within a typical fuel-cell control system. The proposed method is based on relay excitation feedback, a proven solution from controller tuning.

fuel cell ; diagnostics ; prognostics ; relay feedback ; impedance

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