Hunyadi Murph, Simona E. and Murphy, Catherine J. and Colon-Mercado, Hector R. and Torres, Ricardo D. and Heroux, Katie J. and Fox, Elise B. and Thompson, Lucas B. and Haasch, Richard T. (2011) Tuning of size and shape of AuâPt nanocatalysts for direct methanol fuel cells. Journal of Nanoparticle Research, 13 (12). pp. 6347-6364.
Full text is not hosted in this archive but may be available via the Official URL, or by requesting a copy from the corresponding author.
In this article, we report the precise control of the size, shape, and surface morphology of AuâPt nanocatalysts (cubes, blocks, octahedrons, and dogbones) synthesized via a seed-mediated approach. Gold âseedsâ of different aspect ratios (1â4.2), grown by a silver-assisted approach, were used as templates for high-yield production of novel AuâPt nanocatalysts at a low temperature (40Â Â°C). Characterization by electron microscopy (SEM, TEM, HRTEM), energy dispersive X-ray analysis, UVâVis spectroscopy, zeta-potential (surface charge), atomic force microscopy, X-ray photoelectron spectroscopy, and inductively coupled plasma mass spectrometry were used to better understand their physico-chemical properties, preferred reactivities and underlying nanoparticle growth mechanism. A rotating disk electrode was employed to evaluate the AuâPt nanocatalysts electrochemical performance in the oxygen reduction reaction (ORR) and the methanol oxidation reaction of direct methanol fuel cells. The results indicate the AuâPt dogbones are partially and in some cases completely unaffected by methanol poisoning during the evaluation of the ORR. The ORR performance of the octahedron particles in the absence of MeOH is superior to that of the AuâPt dogbones and Pt-black; however, its performance is affected by the presence of MeOH.
|Deposited By:||Prof. Alexey Ivanov|
|Deposited On:||05 Jan 2012 09:30|
|Last Modified:||05 Jan 2012 09:42|
Repository Staff Only: item control page