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Applied Physics A

, Volume 49, Issue 1, pp 95–103 | Cite as

Non-faradaic electrochemical modification of catalytic activity in solid electrolyte cells

  • C. G. Vayenas
  • S. Bebelis
  • S. Neophytides
  • I. V. Yentekakis
Solid-State Ionics

Abstract

The catalytic activity and selectivity of metal catalysts used as electrodes in high temperature solid electrolyte cells can be altered dramatically and in a reversible manner. This is accomplished by electrochemically supplying oxygen anions onto catalytic surfaces via polarized metal-solid electrolyte interfaces. Oxygen anions, forced electrochemically to adsorb on the metal catalyst surface, alter the catalyst work function in a predictable way and lead to reaction rate increases as high as 4000%. Changes in catalytic rates typically exceed the rate of O2− transport to or from the catalyst surface by 102-3 · 105. Significant changes in product selectivity have been also observed. The case of several catalytic reactions in which this new phenomenon has been observed is presented and the origin of the phenomenon is discussed.

PACS

85.80 82.20 82.65 73.20 

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Copyright information

© Springer-Verlag 1989

Authors and Affiliations

  • C. G. Vayenas
    • 1
  • S. Bebelis
    • 1
  • S. Neophytides
    • 1
  • I. V. Yentekakis
    • 1
  1. 1.Institute of Chemical Engineering and High Temperature Chemical Processes, Department of Chemical EngineeringUniversity of PatrasPatrasGreece

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