Post on 06-Jan-2016
description
Five slide on cyclic voltammetry
Chip Nataro
Lafayette College
Experimental setup
Auxiliary electrode
Workingelectrode
Stir bar
Inert gas inlet
Referenceelectrode
Experimental control
Initial, switching and final potentials Scan rate Number of sweeps Concentrations Temperature Electrodes
General experiment
Simple electrode mechanisms Reversible oxidation
Cyclic voltammogram
Fe
Fe
Fe
+
Fe
+
Cyclic voltammogram
Cyclic voltammogram
Epa
Epc
Peak separation = Epa - Epc
Eo = (Epa + Epc)/2
Simple electrode mechanisms Reversible oxidation
Chemically irreversible oxidation
Cyclic voltammogram
S. L. Martinak, L. A. Sites, S. J. Kolb, K. M. Bocage, W. R. McNamara, A. L. Rheingold, J. A. Golen and C. Nataro, J. Organomet. Chem. 2006, 691, 3627.
Simple electrode mechanisms Reversible oxidation
Chemically irreversible oxidation
Chemically reversible oxidation
Cyclic voltammogram
J. H. L. Ong, C. Nataro, J. A. Golen, and A. L. Rheingold, Organometallics, 2003, 22, 5027.
Additional sources Geiger, W. E. Organometallics 2008, 26, 5738.
Mabbott, G. A. J. Chem. Educ. 1983, 60, 697.
Van Benschoten, J. J.; Lewis, J. Y.; Heineman, W. R.; Roston, D. A.; Kissinger, P. T. J. Chem. Educ. 1983, 60, 772.
Geiger, W. E. in Laboratory Techniques in Electroanalytical Chemistry, 2nd Ed., Kissinger, P. T., Heineman, W. R. Eds.; Marcel Dekker, Inc.: New York, 1996, 683.