By a News Reporter-Staff News Editor at Life Science Weekly -- Researchers detail new data in Chalcogens. According to news reporting originating in Berkeley, California, by NewsRx journalists, research stated, "Carbon-supported Pt@Au 'core-shell' nanoparticles with varying surface concentration of platinum atoms have been synthesized using a novel redox-mediated synthesis approach. The synthesis technique allows for a selective deposition of platinum atoms on the surface of prefabricated gold nanoparticles."
The news reporters obtained a quote from the research from the University of California, "Energy dispersive spectroscopic analyses in a scanning electron microscope reveal that the platinum to gold atomic ratios are close to the nominal values, validating the synthesis scheme. X-ray diffraction data indicate an un-alloyed structure. The platinum to gold surface atomic ratio determined from cyclic voltammetry and copper under-potential deposition experiments reveal good agreement with the calculated values at low platinum concentration. However, there is an increase in non-uniformity in the deposition process upon increasing the platinum concentration. Koutecky-Levich analysis of the samples indicates a transition of the total number of electrons transferred (n) in the electrochemical oxygen reduction reaction from two to four electrons upon increasing the surface concentration of platinum atoms. Furthermore, the data indicate that isolated platinum atoms can reduce molecular oxygen but via a two-electron route."
According to the news reporters, the research concluded: "Moreover, successful four-electron reduction of molecular oxygen requires clusters of platinum atoms."
For more information on this research see: Electrochemical Oxygen Reduction Behavior of Selectively Deposited Platinum Atoms on Gold Nanoparticles. Chemphyschem, 2013;14(10):2132-2142. Chemphyschem can be contacted at: Wiley-V C H Verlag Gmbh, Boschstrasse 12, D-69469 Weinheim, Germany. (Wiley-Blackwell - www.wiley.com/; Chemphyschem - onlinelibrary.wiley.com/journal/10.1002/(ISSN)1439-7641)
Our news correspondents report that additional information may be obtained by contacting A. Sarkar, University of California, Lawrence Berkeley Natl Lab, Berkeley, CA 94720, United States. Additional authors for this research include J.B. Kerr and E.J. Cairns (see also Chalcogens).
Keywords for this news article include: Berkeley, Chemistry, California, Chalcogens, United States, Nanotechnology, Electrochemical, Gold Nanoparticles, Emerging Technologies, North and Central America
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