Topics in Catalysis

, Volume 44, Issue 3, pp 419–425 | Cite as

Impedance spectroscopic investigation of a Rh/YSZ catalyst under polarization

  • E. A. Baranova
  • G. Fóti
  • H. Jotterand
  • Ch. Comninellis
Article

Electrochemical impedance spectra at 450–600 °C and \({P_{{\rm{O}}_{\rm{2}} } = 0.5}\) kPa of a rhodium catalyst interfaced with yttria-stabilized-zirconia (Rh/YSZ) were compared with a model based on the mechanism of electrochemical promotion. In the proposed equivalent electric circuit, existence of an “effective” double layer at the gas-exposed catalyst surface and its potential-controlled modification via diffusion of oxygen ions between the O2− conducting solid electrolyte support (YSZ) and the catalyst are represented by two additional elements: adsorption capacitance and Warburg impedance. Under positive polarization, the adsorption capacitance increases dramatically indicating reinforcement of the “effective” double layer at the catalyst/gas interface, in agreement with the observation known from electrochemical promotion practice that positive polarization of a rhodium electrode leads to rhodium oxide reduction, hence, to dramatic increase in catalytic reaction rate.

Keywords

rhodium electrode electrochemical promotion rhodium oxide reduction impedance spectroscopy 

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • E. A. Baranova
    • 1
  • G. Fóti
    • 1
  • H. Jotterand
    • 2
  • Ch. Comninellis
    • 1
  1. 1.Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de LausanneLausanneSwitzerland
  2. 2.Institute of Physics of the Complex Matter, Ecole Polytechnique Fédérale de LausanneLausanneSwitzerland

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