The Behavior of Microdisk and Microring Electrodes. Chronopotentiometry and Linear Sweep Amperometry at a Microdisk Electrode
Abstract
Chronopotentiometry has not been a widely used electroanalytical technique due to the severe distortion of the predicted shape of the response due to capacitative charging of the electrode. While the magnitude of the total current applied to the electrode can be controlled, the fraction of the total current driving the faradaic reaction is time dependent. As the electrode potential changes as the logarithm of the ratio of the surface activities of the redox couple, so must the the magnitude of the capacitative charging current. It is well known that one of the major advantages of microelectrodes is the reduced magnitude of the capacitative component of the current (which varies as the area of the electrode) with respect to the faradaic component (which usually varies as a one dimensional characteristic length of the electrode, such as the radius of a disk). These devices should therefore be ideally suited to galvanostatic measurements.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 15, 1988
- Accession Number
- ADA200841
Entities
People
- J. W. Pons
- L. J. Li
- L. M. Abrantes
- M. Fleischmann
- M. Hawkins
Organizations
- University of Utah