Modeling of spontaneous hydrogen evolution in a direct methanol fuel cell

Qiang Ye, Xiaoguang Yang, Ping Cheng

    Research output: Contribution to journalArticle

    7 Citations (Scopus)

    Abstract

    Hydrogen evolution takes place in the negative electrode of a direct methanol fuel cell with insufficient oxygen supply. In this work, we developed a two-dimensional computational model to investigate the formation and evolution of the galvanic region (GR) and the coupled electrolytic region (ER) where this spontaneous hydrogen evolution occurs. Special attention is paid to the species, potential and current distributions at different air flow rates (AFRs), and the effect of water flooding is highlighted. The open-circuit potential (OCP) of the cell is found to be quite sensitive to the AFR, especially just after the emergence of the abnormal ER. It is also demonstrated that the extent of cathode flooding has dramatic impacts on the cell behavior, which may be the major reason for the observed uncertainties of experimentally measured OCPs and current distributions.

    Original languageEnglish (US)
    Pages (from-to)230-238
    Number of pages9
    JournalElectrochimica Acta
    Volume69
    DOIs
    StatePublished - May 1 2012

    Fingerprint

    Direct methanol fuel cells (DMFC)
    Hydrogen
    Flow rate
    Oxygen supply
    Air
    Cathodes
    Electrodes
    Water
    Networks (circuits)
    Uncertainty

    All Science Journal Classification (ASJC) codes

    • Chemical Engineering(all)
    • Electrochemistry

    Cite this

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    title = "Modeling of spontaneous hydrogen evolution in a direct methanol fuel cell",
    abstract = "Hydrogen evolution takes place in the negative electrode of a direct methanol fuel cell with insufficient oxygen supply. In this work, we developed a two-dimensional computational model to investigate the formation and evolution of the galvanic region (GR) and the coupled electrolytic region (ER) where this spontaneous hydrogen evolution occurs. Special attention is paid to the species, potential and current distributions at different air flow rates (AFRs), and the effect of water flooding is highlighted. The open-circuit potential (OCP) of the cell is found to be quite sensitive to the AFR, especially just after the emergence of the abnormal ER. It is also demonstrated that the extent of cathode flooding has dramatic impacts on the cell behavior, which may be the major reason for the observed uncertainties of experimentally measured OCPs and current distributions.",
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    Modeling of spontaneous hydrogen evolution in a direct methanol fuel cell. / Ye, Qiang; Yang, Xiaoguang; Cheng, Ping.

    In: Electrochimica Acta, Vol. 69, 01.05.2012, p. 230-238.

    Research output: Contribution to journalArticle

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