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Partially selective semiconductor redox electrodes.

W Habermann1, P John, H Matschiner

  • 1Am Gonsenheimer Spiess 8, D-55122, Mainz, Germany.

Analytical and Bioanalytical Chemistry
|September 1, 1996
PubMed
Summary
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New redox electrodes with n-conducting metal oxide coatings offer reliable measurement of oxidizing agents. These electrodes show excellent selectivity and reproducible potential settings, unaffected by oxygen or reducing agents.

Area of Science:

  • Electrochemistry
  • Materials Science
  • Analytical Chemistry

Background:

  • Development of selective electrochemical sensors is crucial for accurate chemical analysis.
  • Passivated metals with metal oxide coatings present a promising material class for electrochemical applications.

Purpose of the Study:

  • To investigate the suitability of redox electrodes with n-conducting metal oxide coatings for measuring oxidizing agent concentrations.
  • To evaluate the selectivity and reproducibility of these novel electrodes.

Main Methods:

  • Fabrication of redox electrodes using passivated metals (subgroups IV-VI) with n-conducting metal oxide surface coatings.
  • Generation of coatings via oxidizing agents or anodic oxidation.
  • Potentiometric measurements to assess electrode performance and selectivity, including testing with nitrosyl ions and chlorine.

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Main Results:

  • Electrodes demonstrated effective measurement of oxidizing agents, unaffected by oxygen or reducing agents.
  • A correlation was found between the conductivity of the passive layer and electrode selectivity.
  • Aged n-conducting passive layers enabled reproducible potential settings with potential changes exceeding Nernst equation predictions.

Conclusions:

  • Redox electrodes with n-conducting metal oxide coatings are well-suited for selective and reproducible measurement of oxidizing agents.
  • The conductivity of the passive layer is a key factor in determining electrode selectivity.
  • These electrodes offer advantages over traditional methods, showing enhanced potential changes and stability.