The effort on direct methanol fuel cells (DMFCs) at Los Alamos National Laboratory (LANL) includes work devoted to portable power applications, funded by the Defense Advanced Research Project Agency (DARPA), and work devoted to potential transport applications, funded by the US DOE. We describe results with a new type of DMFC stack hardware that allows lowering the pitch per cell to 2 mm while allowing low air flow and air pressure drops. Power densities of 300 W/l and 1 kW/l seem achievable under conditions applicable to portable power and transport applications, respectively. It is shown that, in terms of overall system efficiency and system packaging requirements, a power source for a passenger vehicle based on a DMFC could compete favorably with a hydrogen-fueled fuel cell system, as well as with fuel cell systems based on fuel processing on board. As part of more fundamental studies performed, we describe optimization of anode catalyst layers in terms of PtRu catalyst nature, loading and catalyst layer composition and structure. We specifically show that, optimized content of recast ionic conductor added to the catalyst layer is a sensitive function of the nature of the catalyst. Other elements of membrane/electrode assembly (MEA) optimization efforts are also described, highlighting our ability to resolve, to a large degree, a well-documented problem of polymer electrolyte DMFCs, namely 'methanol crossover'. This was achieved by appropriate cell design, enabling fuel utilization as high as 90% in highly performing DMFCs.


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    Titel :

    Recent advances in direct methanol fuel cells at Los Alamos National Laboratory


    Beteiligte:
    Ren, Xiaoming (Autor:in) / Zelenay, P. (Autor:in) / Thomas, S. (Autor:in) / Davey, J. (Autor:in) / Gottesfeld, S. (Autor:in)


    Erscheinungsdatum :

    2000


    Format / Umfang :

    6 Seiten, 7 Quellen




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch





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