38th GREEN Open Seminar
Schedules
2014.11.12
Finished
GREEN Open Seminar will be held on 12nd November, 2014, to have a lecture by Prof. Daniel A. Scherson, Frank Hovorka Professor of Chemistry, Director of the Ernest B. Yeager Center for Electrochemical Sciences, Senior Vicepresident of the Electrochemical Society, Department of Chemistry, Case Western Reserve University.
Abstract
"A novel approach toward unveiling the role of solution phase impurities on the ORR on Pt(poly) in acid electrolytes"
A chronoamperometric method will be presented that allows correlations to be established between the rates of the oxygen reduction reaction, ORR, on the Pt disk of a rotating Pt-ring|Pt-disk electrode, the coverage of adsorbed halide, qX-, X- = Cl- or Br-, the amount of solution phase hydrogen peroxide, H2O2, generated at the disk and the applied potential. Experiments were carried out in O2-saturated 0.1 M HClO4 aqueous solutions containing Cl- or Br- at concentrations in the μM range and involved application of a potential step from a value at which there is no X- adsorption, Eo, to a more positive potential at which X- undergoes adsorption under strict diffusion control.
