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Findings on Chalcogens Discussed by Investigators at University of Toulouse

June 24, 2014

By a News Reporter-Staff News Editor at Life Science Weekly -- Current study results on Chalcogens have been published. According to news originating from Toulouse, France, by NewsRx correspondents, research stated, "Gold nanoparticles (AuNPs) were deposited onto glassy carbon (GC) by constant potential electrolysis (CPE) using various sets of potential and duration from -0.3 to 0.7 V/SHE and 10 to 1800s, respectively. The physico-chemical characteristics of the as-obtained deposits were investigated by cyclic voltammetry (CV) in H2SO4, field emission gun scanning electron microscopy (FEG-SEM), and Pb underpotential deposition (UPD)."

Our news journalists obtained a quote from the research from the University of Toulouse, "Their performances toward the oxygen reduction reaction (ORR) in a NaCl-NaHCO3 (0.15 M/0.028 M, pH 7.4) neutral solution were examined and correlated to AuNPs size and density. The best results were obtained using the deposits which exhibited a high density (555 +/- 49 mu m(-2)) of relatively small AuNPs (25 +/- 12 nm). The Koutecky-Levich treatment was systematically applied to all the deposits in order to determine the number of electrons n exchanged for the ORR in the potential range from 0.1 to -1.0 V/SHE. The values of the cathodic transfer coefficients beta n were also extracted and compared to the values reported for unmodified GC and bulk Au."

According to the news editors, the research concluded: "A map of the beta n values as a function of AuNPs electrodeposition potential and duration was also provided."

For more information on this research see: Electrodeposited gold nanoparticles on glassy carbon: Correlation between nanoparticles characteristics and oxygen reduction kinetics in neutral media. Electrochimica Acta, 2014;128():412-419. Electrochimica Acta can be contacted at: Pergamon-Elsevier Science Ltd, The Boulevard, Langford Lane, Kidlington, Oxford OX5 1GB, England (see also Chalcogens).

The news correspondents report that additional information may be obtained from G. Gotti, Univ Toulouse, UPS, INPT, LCC, F-31077 Toulouse, France. Additional authors for this research include K. Fajerwerg, D. Evrard and P. Gros.

Keywords for this news article include: France, Europe, Toulouse, Chalcogens, Nanotechnology, Gold Nanoparticles, Emerging Technologies

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Source: Life Science Weekly

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