Model interpretation of electrochemical impedance spectroscopy and polarization behavior of H2/CO mixture oxidation in polymer electrolyte fuel cells

X. Wang; I. M. Hsing; Y. J. Leng; P. L. Yue

doi:10.1016/S0013-4686(01)00682-X

Model interpretation of electrochemical impedance spectroscopy and polarization behavior of H₂/CO mixture oxidation in polymer electrolyte fuel cells

X. Wang, I. M. Hsing, Y. J. Leng, P. L. Yue

Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

57 Scopus citations

Abstract

A mathematical model is proposed based on electrode kinetics analysis for the oxidation of 2% CO +H₂ mixture in polymer electrolyte fuel cells. Successful simulation of the polarization curve and experimental impedance spectra for Pt/C electrode system confirm the validity of the model which shows that the impedance is strongly dependent on electrode potential. With the increase of potential, an inductive behavior will occur. It is believed that the appearance of this inductive pattern can be used as a criterion for the onset of CO oxidation by the coincidence of the potential at which inductive behavior occurs with the ignition potential for CO oxidation. The effects of change of CO oxidation rate constant and CO adsorption equilibrium constant on impedance pattern, as well as on CO surface coverage and Faradaic current are also delineated with the use of the proposed model.

Original language	English (US)
Pages (from-to)	4397-4405
Number of pages	9
Journal	Electrochimica Acta
Volume	46
Issue number	28
DOIs	https://doi.org/10.1016/S0013-4686(01)00682-X
State	Published - Aug 13 2001

All Science Journal Classification (ASJC) codes

Chemical Engineering(all)
Electrochemistry

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10.1016/S0013-4686(01)00682-X

Cite this

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title = "Model interpretation of electrochemical impedance spectroscopy and polarization behavior of H2/CO mixture oxidation in polymer electrolyte fuel cells",

abstract = "A mathematical model is proposed based on electrode kinetics analysis for the oxidation of 2% CO +H2 mixture in polymer electrolyte fuel cells. Successful simulation of the polarization curve and experimental impedance spectra for Pt/C electrode system confirm the validity of the model which shows that the impedance is strongly dependent on electrode potential. With the increase of potential, an inductive behavior will occur. It is believed that the appearance of this inductive pattern can be used as a criterion for the onset of CO oxidation by the coincidence of the potential at which inductive behavior occurs with the ignition potential for CO oxidation. The effects of change of CO oxidation rate constant and CO adsorption equilibrium constant on impedance pattern, as well as on CO surface coverage and Faradaic current are also delineated with the use of the proposed model.",

author = "X. Wang and Hsing, {I. M.} and Leng, {Y. J.} and Yue, {P. L.}",

note = "Funding Information: The authors gratefully acknowledge the Hong Kong Research Grants Council (HKUST6042/00P) for the funding support. Copyright: Copyright 2017 Elsevier B.V., All rights reserved.",

year = "2001",

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doi = "10.1016/S0013-4686(01)00682-X",

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T1 - Model interpretation of electrochemical impedance spectroscopy and polarization behavior of H2/CO mixture oxidation in polymer electrolyte fuel cells

AU - Wang, X.

AU - Hsing, I. M.

AU - Leng, Y. J.

AU - Yue, P. L.

N1 - Funding Information: The authors gratefully acknowledge the Hong Kong Research Grants Council (HKUST6042/00P) for the funding support. Copyright: Copyright 2017 Elsevier B.V., All rights reserved.

PY - 2001/8/13

Y1 - 2001/8/13

N2 - A mathematical model is proposed based on electrode kinetics analysis for the oxidation of 2% CO +H2 mixture in polymer electrolyte fuel cells. Successful simulation of the polarization curve and experimental impedance spectra for Pt/C electrode system confirm the validity of the model which shows that the impedance is strongly dependent on electrode potential. With the increase of potential, an inductive behavior will occur. It is believed that the appearance of this inductive pattern can be used as a criterion for the onset of CO oxidation by the coincidence of the potential at which inductive behavior occurs with the ignition potential for CO oxidation. The effects of change of CO oxidation rate constant and CO adsorption equilibrium constant on impedance pattern, as well as on CO surface coverage and Faradaic current are also delineated with the use of the proposed model.

AB - A mathematical model is proposed based on electrode kinetics analysis for the oxidation of 2% CO +H2 mixture in polymer electrolyte fuel cells. Successful simulation of the polarization curve and experimental impedance spectra for Pt/C electrode system confirm the validity of the model which shows that the impedance is strongly dependent on electrode potential. With the increase of potential, an inductive behavior will occur. It is believed that the appearance of this inductive pattern can be used as a criterion for the onset of CO oxidation by the coincidence of the potential at which inductive behavior occurs with the ignition potential for CO oxidation. The effects of change of CO oxidation rate constant and CO adsorption equilibrium constant on impedance pattern, as well as on CO surface coverage and Faradaic current are also delineated with the use of the proposed model.

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Model interpretation of electrochemical impedance spectroscopy and polarization behavior of H₂/CO mixture oxidation in polymer electrolyte fuel cells

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