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Electrochemical low-frequency impedance spectroscopy algorith for diagnostics of PEM fuel cell degradation

Ivar J. Halvorsen; Ivan Pivac; Dario Bezmalinovic; Frano Barbir; Federico Zenith


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    "description": "<p>In order to estimate fuel-cell degradation status on-line and inexpensively, a diagnostic technique based on relay feedback is developed. The technique can obtain critical parameters within seconds of start-up and is robust to measurement bias.</p>\n\n<p>Electrochemical impedance spectroscopy (EIS) is a popular laboratory technique to perform diagnostics on electrochemical systems such as fuel cells, but its application to real-life fuel-cell systems is difficult because of the size and cost of the apparatus. In this study, we present a more detailed equivalent-circuit model for a PEM fuel cell, able to explain the positive reactance shown at low frequencies.</p>\n\n<p>Some of these characteristics, measured at several stages during an Accelerated Stress Test (AST), progress gradually with catalyst degradation, providing an effective prognostic variable. In order to measure these characteristics, a relay-based feedback excitation algorithm is developed to estimate the low-frequency intercept in the Nyquist plane of the cell impedance without resorting to a full-fledged EIS.</p>\n\n<p>The simulations indicate that the algorithm converges to an estimate within about 5 seconds, and is robust to bias. The algorithm can be run within the standard control system that fuel cells are usually equipped with, with no additional hardware.</p>", 
    "license": {
      "id": "CC-BY-4.0"
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    "title": "Electrochemical low-frequency impedance spectroscopy algorith for diagnostics of PEM fuel cell degradation", 
    "journal": {
      "volume": "45", 
      "issue": "2", 
      "title": "International Journal Hydrogen Energy"
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        "title": "Giantleap Improves Automation of Non-polluting Transportation with Lifetime Extension of Automotive PEM fuel cells", 
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        "program": "H2020", 
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    "keywords": [
      "fuel cell diagnostics, impedance spectroscopy"
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    "publication_date": "2020-01-30", 
    "creators": [
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        "affiliation": "SINTEF Digital", 
        "name": "Ivar J. Halvorsen"
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      {
        "affiliation": "FESB University of Split", 
        "name": "Ivan Pivac"
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      {
        "affiliation": "FESB University of Split", 
        "name": "Dario Bezmalinovic"
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      {
        "affiliation": "FESB University of Split", 
        "name": "Frano Barbir"
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      {
        "orcid": "0000-0003-4329-120X", 
        "affiliation": "SINTEF Digital", 
        "name": "Federico Zenith"
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