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Electrochemical promotion of electronically isolated and dispersed Pt catalysts

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Abstract

In this paper we discuss the first attempts to induce the effect of Electrochemical Promotion or Non-Faradaic Electrochemical Modification of Catalytic Activity (NEMCA) on highly dispersed catalyst-electrodes systems which can compete in terms of dispersion and surface area with industrial catalysts. Three systems are discussed:

  1. 1.

    Electrochemical promotion of C2H4 oxidation on electronically isolated Pt catalysts on Y2O3-stabilized-Zirconia (YSZ) where NEMCA is induced via potential application between two terminal Au electrodes also supported on the solid electrolyte (bipolar design).

  2. 2.

    Electrochemical promotion of C2H4 oxidation on a finely dispersed Pt catalyst deposited on a Au electrode which is supported on YSZ.

  3. 3.

    Induction of NEMCA during CH3OH oxidation on Pt without external voltage application by utilizing the potential difference developed between the catalyst and a catalytically inert counter electrode.

In all cases significant non faradaic behavior has been obtained. The underlying catalytic/ electro-catalytic phenomena are discussed together with some of the engineering challenges for potential practical applications.

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Marwood, M., Balomenou, S., Tsiliras, A. et al. Electrochemical promotion of electronically isolated and dispersed Pt catalysts. Ionics 4, 207–214 (1998). https://doi.org/10.1007/BF02375947

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Keywords

  • Catalytic Activity
  • Voltage Application
  • CH3OH
  • Counter Electrode
  • Solid Electrolyte