Hydrogen crossover diagnosis for fuel cell stack: An electrochemical impedance spectroscopy based method

Sida Li, Xuezhe Wei, Shangfeng Jiang, Hao Yuan, Pingwen Ming, Xueyuan Wang and Haifeng Dai

Applied Energy, 2022, vol. 325, issue C, No S0306261922011497

Abstract: Hydrogen crossover rate is a key parameter for characterizing internal gas leakage in proton exchange membrane fuel cells. Voltammetric and galvanostatic techniques are most commonly used in measuring hydrogen crossover. However, for the present, the existing methods have the drawbacks of being laborious and time-consuming. In this paper, electrochemical impedance spectroscopy is exploited for the first time to characterize hydrogen crossover in fuel cells. An equivalent circuit model is established based on comprehensively analyzing different electrochemical processes occurring on fuel cell electrodes. By comparing the measured impedance characteristics under various experimental conditions, it is found that a unique model parameter monotonically decreases with increasing hydrogen crossover rate. Accordingly, this single parameter is identified as the diagnostic indicator for hydrogen crossover. The effectiveness of the proposed method is validated on a single cell and a multi-cell stack. Our method allows deployment to each individual cell or multiple groups of cells in a fuel cell stack. Furthermore, one entire measurement by this method takes only 4 min, and the consumed time will not increase with the number of cells in the stack. It will provide a powerful tool for failure diagnosis and lifespan evaluation of fuel cell stack.

Keywords: Fuel cell; Hydrogen Leakage; Short circuit resistance; Electrochemical impedance spectroscopy; Fault diagnosis (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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DOI: 10.1016/j.apenergy.2022.119884

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