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.
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Baranova, E.A., Fóti, G., Jotterand, H. et al. Impedance spectroscopic investigation of a Rh/YSZ catalyst under polarization. Top Catal 44, 419–425 (2007). https://doi.org/10.1007/s11244-006-0134-2
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DOI: https://doi.org/10.1007/s11244-006-0134-2