Temperature programmed desorption of oxygen from Pd films interfaced with Y2O3-doped ZrO2

Original Paper

Abstract

The origin of the effect of non-faradaic electrochemical modification of catalytic activity (NEMCA) or Electrochemical Promotion was investigated via temperature-programmed-desorption (TPD) of oxygen, from polycrystalline Pd films deposited on 8 mol%Y2O3–stabilized–ZrO2 (YSZ), an O2− conductor, under high-vacuum conditions and temperatures between 50 and 250 °C. Oxygen was adsorbed both via the gas phase and electrochemically, as O2−, via electrical current application between the Pd catalyst film and a Au counter electrode. Gaseous oxygen adsorption gives two adsorbed atomic oxygen species desorbing at about 300 °C (state β1) and 340–500 °C (state β2). The creation of the low temperature peak is favored at high exposure times (exposure >1 kL) and low adsorption temperatures (Tads < 200 °C). The decrease of the open circuit potential (or catalyst work function) during the adsorption at high exposure times, indicates the formation of subsurface oxygen species which desorbs at higher temperatures (above 450 °C). The desorption peak of this subsurface oxygen is not clear due to the wide peaks of the TPD spectra. The TPD spectra after electrochemical O2− pumping to the Pd catalyst film show two peaks (at 350 and 430 °C) corresponding to spillover Oads and \( O^{{\delta - }}_{{\rm ads}} \) according to the reaction:
$$ O^{{2 - }}_{{\rm (YSZ)}} \to {\text{O}}^{{\delta - }}_{{{\text{ads}}}} \to {\text{O}}_{{{\text{ads}}}} $$

The formation of the spillover \( O^{{\delta - }}_{{\rm ads}} \) oxygen species is an intermediate stage before the formation of the atomic adsorbed oxygen, Oads. Mixed gaseous and electrochemical adsorption was carried out in order to simulate the Electrochemical Promotion conditions. The initial surface coverage with oxygen from the gas phase plays a very important role on the high or low effect of polarization. In general mixed adsorption leads to much higher oxygen coverages compare with that observed either under gaseous or electrochemical adsorption. The binding strength of the atomic adsorbed oxygen (state β2) was investigated as a function of applied potential. It was found that the binding energy decreases linearly with increasing catalyst potential and work function. Similar behavior has been observed for oxygen adsorption on Pt, Ag and Au deposited on YSZ in previous studies.

Keywords

Temperature programmed desorption Oxygen adsorption on Pd Electrochemical promotion Electrochemical adsorption Palladium supported catalyst Spillover-backspillover of oxygen NEMCA effect 

Notes

Acknowledgements

The author would like to thank Professor Costas Vayenas from University of Patras for helpful discussions and his support, friendship and trust during the last 10 years. I am also very thankful to Professor George Karatzas and especially to my reviewers for their very thorough review and numerous very helpful suggestions.

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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  1. 1.Department of Environmental EngineeringTechnical University of CreteChaniaGreece

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