Development of a methodology to optimize the air bleed in PEMFC systems operating with low quality hydrogen

Luis Pérez, T. Rajala, Jari Ihonen, Pauli Koski, J.M. Sousa, A. Mendes (Corresponding Author)

    Research output: Contribution to journalArticleScientificpeer-review

    20 Citations (Scopus)

    Abstract

    The use of hydrogen with lower quality than that specified in current regulation is an attractive option for stationary PEMFC power production. In this paper, the effect of CO is mitigated using air bleed levels up to 2% in an H2 PEMFC fed with CO concentrations below 20 ppm. A methodology to optimize the air bleed levels is developed using a novel arrangement of cells coupled to a gas chromatograph. The methodology relies on evaluating the distributed performance of the cell and on determining the CO and CO2 molar flow rates at the anode outlet. Furthermore, the amount of CO adsorbed onto the catalyst and the fraction of catalytic sites covered by CO are estimated. The results show that different parameters, such as the H2 volumetric flow rate, CO concentration and air bleed level, influence both the steady state and dynamics of PEMFCs operated with low quality hydrogen.
    Original languageEnglish
    Pages (from-to)16286-16299
    Number of pages13
    JournalInternational Journal of Hydrogen Energy
    Volume38
    Issue number36
    DOIs
    Publication statusPublished - 2013
    MoE publication typeA1 Journal article-refereed

    Keywords

    • air bleed
    • carbon monoxide
    • gas chromatography
    • hydrogen quality
    • segmented PEMFC

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