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Assessment of Boron Doped Diamond Electrode Quality and Application to In Situ Modification of Local pH by Water Electrolysis
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Published on: January 6, 2016

The surface conductivity at the diamond/aqueous electrolyte interface.

Jose A Garrido1, Andreas Härtl, Markus Dankerl

  • 1Walter Schottky Institut, Technische Universität München, Garching, Germany, and EADS Innovation Works Germany, EADS Deutschland GmbH, Munich, Germany.

Journal of the American Chemical Society
|March 5, 2008
PubMed
Summary
This summary is machine-generated.

Surface conductivity in aqueous electrolytes arises from capacitive charging, not charge transfer, for H-terminated diamond films. This finding explains differences in pH sensitivity observed in air versus liquid environments.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Surface Chemistry

Background:

  • H-terminated diamond films exhibit surface conductivity.
  • The origin of this conductivity in aqueous electrolytes has been debated.
  • Discrepancies exist in pH sensitivity between air and aqueous environments.

Purpose of the Study:

  • To elucidate the mechanism of surface conductivity in H-terminated diamond films immersed in aqueous electrolytes.
  • To resolve the differing pH sensitivity observations in air and aqueous media.
  • To investigate the role of interfacial potential control.

Main Methods:

  • Electrochemical impedance spectroscopy.
  • Potentiostatic control of the diamond/electrolyte interface.
  • Analysis of surface conductivity under varying conditions.

Main Results:

  • Surface conductivity in aqueous electrolyte is governed by capacitive charging, not charge transfer.
  • The diamond/electrolyte interface behaves as an almost ideally polarizable electrode.
  • Gate electrode control of interfacial potential confirmed capacitive charging mechanism.

Conclusions:

  • Capacitive charging, not charge transfer, is the dominant mechanism for surface conductivity in aqueous electrolytes for H-terminated diamond.
  • This mechanism reconciles the differing pH sensitivities observed in air and aqueous environments.
  • The findings provide a clearer understanding of surface electronic properties of diamond in electrochemical systems.