Carbon Ceramic Electrode Modified with Redox Probe Solution in Hydrophobic Polar Solvents

Galyna Shul ,  Marcin Opallo 

Polish Academy of Sciences, Institute of Physical Chemistry, Kasprzaka 44/52, Warszawa 01-224, Poland


The evolution of sol-gel technology and organically modified ceramic materials created new possibilities for electroanalytical sensors. Lev and coworkers introduced a new class of sol-gel derived composite carbon ceramic electrodes (CCE). One of the ways of modification of CCE with large number of redox groups is impregnation with redox probe solution in hydrophobic polar solvent.
The CCE modified with redox probe (ferrocene, t-butyloferrocene or decamethyloferrocene) solution in hydrophobic polar solvent (nitrobenzene, 2-nitrophenyloctylether or 2-nitrodiphenylether) was prepared and studied. The electrode material was obtained by sol-gel process. It consists of the graphite powder homogeneously dispersed in hydrophobic silica matrix based on methyltrimethoxysilane. After drying and gelation, the electrode was immersed in modifier solution. The electrochemical properties of the electrode were investigated in aqueous salt solution. The features of cyclic voltammetry curves: stability, peak current magnitude, shape and midpeak potential corresponding to the redox reaction depend on the redox probe, organic solvent and the salt present in aqueous phase. The redox probe is easier to oxidize in the presence of less hydrated anions. The magnitude of peak current is proportional to concentration of salt in aqueous phase.
The electrooxidation of redox probe dissolved in hydrophobic solvent present within pores hydrophobic silicate matrix is followed by anion transfer from aqueous phase, with simultaneous redox active cation transfer to the aqueous phase. The contribution of both reactions phase depends on the type of redox probe, the type of electrolyte and its concentration. The electrode process occurs at the three phase junction formed by graphite particle and liquid organic-aqueous interface supported by hydrophobic silicate matrix. The studied electrode may become attractive sensors on the redox inactive anion present in aqueous phase.

Legal notice
  • Legal notice:

    Copyright (c) Pielaszek Research, all rights reserved.
    The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
    In every case, proper references including Author(s) name(s) and URL of this webpage: must be provided.


Related papers
  1. BIOPHOSENS: Carbon nanomaterials based electrochemical biosensor for detection of highly toxic organophosphate pesticides
  2. Titanium dioxide nanotube and enzyme-enhanced photo-bio-fuel cell
  3. Ascorbic acid-oxygen biofuel cell and  zinc-oxygen cell based on carbon-silicate biocathode
  4. A role of phosphonium-phosphate ionic liquid in anion-sensing mechanism at toluene-modified electrode
  5. One-step reduction and functionalization of graphene oxide sheets using biomimetic dopamine derivatives
  6. Pyrene functionalised single-walled carbon nanotubes for bioelectrocatalysis
  7. Bioelectrocatalytic electrode obtained by layer-by-layer assembling of sol-gel processed ionic liquid and hydrophilic carbon nanoparticles and adsorbed bilirubine oxidase
  8. Multistep electroreduction of fullerene C60 in 1,2-dichlorobenzene-water biphasic system
  9. A facile preparation of the nanoparticulate film from conductive and nonconductive particles of the opposite charge
  10. Bilirubin oxidase modified carbon ceramic electrode for bioelectrocatalytic reduction of dioxygen supplied from gas phase
  11. Bioelectrocatalytic dioxygen reduction at carbon nanotubes – silicate composite film modified electrode
  12. Driving ion transfer across the toluene (trihexyl(tetradecyl)-phosphonium tris(pentafluoroethyl)trifluoro-phosphate) | water (electrolyte) interface with the MnTPP(III/II) redox system
  13. Covalently bonded ionic liquid modified electrodes
  14. Scanning electrochemical microscopy study of laccase embedded in sol-gel processed silicate film
  15. Room temperature ionic liquid based carbon paste electrode
  16. Biphasic electrochemistry of ionic liquids deposited on the electrode surface
  17. Ion transfer electrodes based on carbon nanofibers embedded in silicate film modified with room temperature ionic liquid
  18. Nanoobjects embedded in silicate films for biphasic electrodes
  19. Electrocatalytic reduction of dioxygen by redox mediator and laccase immobilised in silicate thin film
  20. Silicate Modified Electrodes for Chemical Sensing

Presentation: Short communication at SMCBS 2003 Workshop, by Galyna Shul
See On-line Journal of SMCBS 2003 Workshop

Submitted: 2003-09-08 16:24
Revised:   2009-06-08 12:55
© 1998-2021 pielaszek research, all rights reserved Powered by the Conference Engine