COLL 609 |
| The understanding of the synergistic activity and stability of multimetallic nanoparticle catalysts requires the ability to establish the activity-stability-composition correlation. This paper discusses recent findings of an investigation of bimetallic and trimetallic nanoparticles on different support materials. The bimetallic or trimetallic nanoparticles with controllable sizes (1-5 nm) and compositions of different metal combinations (e.g., Pt, Au, Ag, Fe, Ni, V, W, etc.) were synthesized by molecularly-engineered reduction or decomposition reactions in solutions. Electrocatalysts were prepared by loading the nanoparticles onto carbon support and controlled thermal treatments. An array of techniques was used for the characterization, including XRD, FTIR, TEM-EDX, and XPS. The FTIR study of CO adsorption on the surface of bimetallic alloy nanoparticles reveals new insights into the correlation between the bimetallic composition and the d-band shift in the alloy derived from DFT calculations. The synergistic activity and stability of the electrocatalysts in fuel cell reactions, including methanol oxidation reaction and oxygen reduction reaction, were investigated by electrochemical techniques. The results will be discussed in terms of the synergistic properties of the bimetallic/trimetallic electrocatalysts for fuel cell application.
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Physical and Computational Characterization of Nanostructured Electrocatalysts
2:00 PM-4:20 PM, Thursday, 14 September 2006 Sir Francis Drake -- Empire Room, Oral
Division of Colloid & Surface Chemistry |