The Behavior of Microring and Microdisk Electrodes
Abstract
An exact analysis of diffusion to microdisk and mircroring electrodes is presented for steady-state conditions and for the assumptions of constant concentration over the surface of the disk and constant flux over the surface of the ring electrodes. Mass transfer to ring electrodes is progressively enhanced by reducing their thickness which also reduces changes in concentration with position over the surface of the ring as well as the differences between the mass transfer coefficient for the constant flux conditions. Thin rings are therefore recommended for investigations of electrode kinetics. There has, been a recent movement toward the utilization of ultramicroelectrodes for electrochemical measurements; the high mass transport rates, small currents, and low surface areas which characterize these devices provide distinct advantage over measurements at conventionally sized electrodes. High mass transport rates, due to the essentially spherical diffusion field surrounding these structures, give rise to unchanging concentration profiles in short times.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 15, 1988
- Accession Number
- ADA200299
Entities
People
- M. Fleischmann
- Stanley Pons
Organizations
- University of Utah