Scanning electrochemical microscopy. Theory of the feedback mode for hemispherical ultramicroelectrodes: Steady-state and transient behavior

Yoram Selzer, Daniel Mandler*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

70 Scopus citations

Abstract

This contribution represents the first comprehensive attempt to treat complex geometry configurations of the scanning electrochemical microscope (SECM) using the alternating direction implicit finite difference method (ADIFDM). Specifically, ADIFDM is used to simulate the steady-state as well as the transient (chronoamperometric) behavior of a hemispherical ultramicroelectrode (UME) tip of the SECM. The feedback effect in this configuration is less pronounced as compared with a disk-shaped UME system. The differences between the two systems are discussed. Analytical approximations for the steady-state behavior and for characteristic features of the transient behavior are suggested. Finally, experimental feedback currents measured above a conductor and an insulator are in excellent agreement with the theory.

Original languageAmerican English
Pages (from-to)2383-2390
Number of pages8
JournalAnalytical Chemistry
Volume72
Issue number11
DOIs
StatePublished - 1 Jun 2000

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