Electrochemical and XRD characterization of platinum-ruthenium blacks for DMFC anodes.

Conference · Tue Jan 01 04:00:00 EST 2002

OSTI ID:976346

Eickes, C ^[1]; Brosha, E L ^[2]; Garzon, F H ^[3]; Purdy, G M ^[4]; Zelenay, P ^[5]; Morita, T ^[6]; Thompsett, D ^[7]

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1. Christian
2. Eric L.
3. Fernando H.
4. Geraldine M.
5. Piotr
6. Takanari
7. David

It is generally accepted that Pt-Ru alloy catalysts with an atomic Pt-to-Ru ratio of 1:1 generate the best anode perform'ance in the direct methanol fuel cell (DMFG). However, at near-ambient cell operating temperatures, Gasteiger et al. reported that a catalyst with significantly lower Ru content, {approx} 10 at %, offers the highest activity towards methanol. Recently, Dinh et al. demonstrated that the activity of different Pt-Ru catalysts with the same Pt-to-Ru atomic ratio in the bulk might vary depending on the actual surface composition, which is often significantly different from that in the bulk phase, In this work, we study several experimental Pt-Ru catalysts (Johnson Matthey) with Pt-to-Ru atomic ratio ranging from 9: 1 to 1 :2. Electrocatalytic activity of these catalysts in methanol oxidation reaction is investigated in a regular DMFC 'and probed using voltammetric stripping of surhce CO.

• Research Organization: Los Alamos National Laboratory
• Sponsoring Organization: DOE
• OSTI ID: 976346
• Report Number(s): LA-UR-02-5829
• Country of Publication: United States
• Language: English

Related Subjects

10 SYNTHETIC FUELS
30 DIRECT ENERGY CONVERSION
ALLOYS
ANODES
CATALYSTS
DIRECT METHANOL FUEL CELLS
FUEL CELLS
MEMBRANES
METHANOL
OXIDATION
PROTONS
X-RAY DIFFRACTION