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.