Methanol anode modified by semipermeable membrane for mixed-feed direct methanol fuel cells

R. Kothandaraman, Weihua Deng, Moses Sorkin, Arthur Kaufman, H. Frank Gibbard, Scott Calabrese Barton

    Research output: Contribution to journalArticle

    • 10 Citations

    Abstract

    Mixed-feed direct methanol fuel cells, which operate on a single feed stream comprised of fuel and oxidant, were constructed using PtRu anode catalysts. Reaction selectivity favoring methanol oxidation at the anode was achieved by application of a barrier layer comprised of reconstituted Nafion, and optionally carbon black, hot pressed between the anode catalyst layer and reactant diffusion layer. The modified anode outperformed an unmodified anode in the presence of mixed feed at 60 and 80°C. This result is attributed to reduced infiltration of oxygen from the mixed feed due to introduction of a barrier that admits mainly aqueous methanol. Inclusion of carbon black in the barrier layer led to ∼30% increase in current density at 350 mV /dynamic hydrogen electrode, attributable to reduced contact resistance. On increasing the cell temperature from 60 to 80°C, the activation polarization region vanished for anodes that were either unmodified or modified by a Nafion-carbon barrier layer. This result is attributed to decreased water content in the barrier at elevated temperature, leading to increased oxygen flux and thereby introducing a mixed potential at the anode.

    Original languageEnglish (US)
    JournalJournal of the Electrochemical Society
    Volume155
    Issue number9
    DOIs
    StatePublished - 2008

    Profile

    anodes
    Anodes
    Autopsy
    methyl alcohol
    barrier layers
    carbon
    Methanol
    fuel cells
    catalysts
    oxygen
    temperature
    Direct methanol fuel cells (DMFC)
    Carbon black
    Catalysts
    Oxygen
    Temperature
    Acetanilides
    Afferent Loop Syndrome
    infiltration
    contact resistance

    ASJC Scopus subject areas

    • Electrochemistry
    • Surfaces, Coatings and Films
    • Surfaces and Interfaces

    Cite this

    Methanol anode modified by semipermeable membrane for mixed-feed direct methanol fuel cells. / Kothandaraman, R.; Deng, Weihua; Sorkin, Moses; Kaufman, Arthur; Gibbard, H. Frank; Barton, Scott Calabrese.

    In: Journal of the Electrochemical Society, Vol. 155, No. 9, 2008.

    Research output: Contribution to journalArticle

    Kothandaraman, R.; Deng, Weihua; Sorkin, Moses; Kaufman, Arthur; Gibbard, H. Frank; Barton, Scott Calabrese / Methanol anode modified by semipermeable membrane for mixed-feed direct methanol fuel cells.

    In: Journal of the Electrochemical Society, Vol. 155, No. 9, 2008.

    Research output: Contribution to journalArticle

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    abstract = "Mixed-feed direct methanol fuel cells, which operate on a single feed stream comprised of fuel and oxidant, were constructed using PtRu anode catalysts. Reaction selectivity favoring methanol oxidation at the anode was achieved by application of a barrier layer comprised of reconstituted Nafion, and optionally carbon black, hot pressed between the anode catalyst layer and reactant diffusion layer. The modified anode outperformed an unmodified anode in the presence of mixed feed at 60 and 80°C. This result is attributed to reduced infiltration of oxygen from the mixed feed due to introduction of a barrier that admits mainly aqueous methanol. Inclusion of carbon black in the barrier layer led to ∼30% increase in current density at 350 mV /dynamic hydrogen electrode, attributable to reduced contact resistance. On increasing the cell temperature from 60 to 80°C, the activation polarization region vanished for anodes that were either unmodified or modified by a Nafion-carbon barrier layer. This result is attributed to decreased water content in the barrier at elevated temperature, leading to increased oxygen flux and thereby introducing a mixed potential at the anode.",
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    AU - Kothandaraman,R.

    AU - Deng,Weihua

    AU - Sorkin,Moses

    AU - Kaufman,Arthur

    AU - Gibbard,H. Frank

    AU - Barton,Scott Calabrese

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    AB - Mixed-feed direct methanol fuel cells, which operate on a single feed stream comprised of fuel and oxidant, were constructed using PtRu anode catalysts. Reaction selectivity favoring methanol oxidation at the anode was achieved by application of a barrier layer comprised of reconstituted Nafion, and optionally carbon black, hot pressed between the anode catalyst layer and reactant diffusion layer. The modified anode outperformed an unmodified anode in the presence of mixed feed at 60 and 80°C. This result is attributed to reduced infiltration of oxygen from the mixed feed due to introduction of a barrier that admits mainly aqueous methanol. Inclusion of carbon black in the barrier layer led to ∼30% increase in current density at 350 mV /dynamic hydrogen electrode, attributable to reduced contact resistance. On increasing the cell temperature from 60 to 80°C, the activation polarization region vanished for anodes that were either unmodified or modified by a Nafion-carbon barrier layer. This result is attributed to decreased water content in the barrier at elevated temperature, leading to increased oxygen flux and thereby introducing a mixed potential at the anode.

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