Accession Number:

ADA242500

Title:

Electron Conduction in Organic Solutions

Descriptive Note:

Technical rept. no. 2 for period ending 1 Jan 91,

Corporate Author:

MINNESOTA UNIV MINNEAPOLIS DEPT OF CHEMICAL ENGINEERING AND MATERIALS SCIENCE

Report Date:

1991-11-10

Pagination or Media Count:

18.0

Abstract:

A voltammetric study of electron conduction in nitrobenzeneNB toluene solutions is presented. Analysis of steady-state mass transport limited currents corresponding to the first and second one-electron reductions of NB to the radical anion, NB-, and dianion, NB-2, respectively indicates that electrogeneration of NB-2 is suppressed to negligible values in concentrated NB solutions as a result of the increased flux of electrons away from the electrode surface via the self-exchange electron-transfer mechanism. Electrical conduction in nonmetallic liquids occurs by diffusion, migration, and convection of charges species. As early as 1966, it was proposed by Levich that in addition to these mechanisms, self-exchange electron-transfer reactions involving a reversible electroactive couple, can enhance the apparent transport of A and A- in a potential gradient. This type of charge transport has been the focus of numerous investigations during the past decade concerned with thin films containing fixed-site redox centers. In these systems, transport occuring by electron hopping has been shown to be equivalent to diffusion migration of the immobilized redox centers with an apparent diffusivity.

Subject Categories:

  • Physical Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE