Abstract
Electrochemical impedance spectroscopy is one of the important tools for the performance analysis and diagnosis of proton exchange membrane fuel cells. The equivalent circuit model is an effective method for electrochemical impedance spectroscopy resolution. In this paper, four typical equivalent circuit models are selected to comprehensively compare and analyze the difference in the fitting results of the models for the electrochemical impedance spectroscopy under different working conditions (inlet pressure, stoichiometry, and humidity) from the perspective of the fitting accuracy, change trend of the model parameters, and the goodness of fit. The results show that the fitting accuracy of the model with the Warburg element is the best for all under each working condition. When considering the goodness of fit, the model with constant phase components is the best choice for fitting electrochemical impedance spectroscopy under different inlet pressure and air stoichiometry. However, under different air humidity, the model with the Warburg element is best. This work can help to promote the development of internal state analysis, estimation, and diagnosis of the fuel cell based on the equivalent circuit modeling of electrochemical impedance spectroscopy.
Highlights
With the rapid development of global industrialization, the excessive use of fossil fuels leads to the increasingly serious problem of environmental pollution
The equivalent circuit modeling method is the most commonly used in EIS analysis, the equivalent circuit model is usually composed of basic circuit elements such as series of parallel resistances and capacitance to fit the measured electrochemical impedance spectroscopy
The EIS of the fuel cell under different inlet pressure, air stoichiometry, and humidity are measured through the experiment
Summary
With the rapid development of global industrialization, the excessive use of fossil fuels leads to the increasingly serious problem of environmental pollution. The equivalent circuit modeling method is the most commonly used in EIS analysis, the equivalent circuit model is usually composed of basic circuit elements such as series of parallel resistances and capacitance to fit the measured electrochemical impedance spectroscopy It can combine the internal state of the fuel cell with model parameters to describe the changing trend of the impedance under different working conditions without the complicated mechanism processes. The fault diagnosis is carried out by measuring the impedance spectroscopy under different working conditions with the auxiliary equipment during the operation, and using the equivalent circuit modeling method to analyze the model parameters as fault characteristic variables to identify the fault.
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