Pt, Au and Ag Electrodes on BiCuVOx

Abstract

Impedance spectra of a porous Pt, Au and Ag electrode on Bi2Cu(0.1)V(0.9)O(5.35) (BiCuVOx) were studied as function of temperature (200 deg to 735 deg C), oxygen partial pressure and polarization level. Also, dc polarization curves (I-V) were measured at intermediate (473 deg C) and high (735 deg) temperature. At low temperature (<500 deg) the electrode response is slow, characterized by hysteresis in the I-V curves. The impedance spectra of Pt and Au electrodes at low temperature are nearly identical, in contrast with observations for zirconia-based electrodes. High temperature impedance spectra are characterized by a significant contribution of a diffusion type element (Warburg) parallel to a resistance with characteristics of a charge transfer resistance. Both elements show strong dependence on pO2 and polarization level. Results are explained with theoretical and observational arguments.

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Document Details

Document Type
Technical Report
Publication Date
Aug 28, 1998
Accession Number
ADA356633

Entities

People

  • Bernard A. Boukamp

Organizations

  • University of Twente

Tags

DTIC Thesaurus Topics

  • Anodic Polarization
  • Bismuth Oxides
  • Charge Carriers
  • Charge Transfer
  • Chemistry
  • Composite Materials
  • Electrodes
  • High Temperature
  • Impedance
  • Low Temperature
  • Materials
  • Materials Science
  • Measurement
  • Partial Pressure
  • Polarization
  • Resistance
  • Spectra

Fields of Study

  • Materials science

Readers

  • Electrochemical Surface Science
  • Materials Science and Engineering.
  • Thermal Physics or Thermal Science.