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The role of low coverage sodium surface species on electrochemical promotion in a Pt/YSZ system
- Source :
-
Solid State Ionics . Oct2012, Vol. 225, p386-389. 4p. - Publication Year :
- 2012
-
Abstract
- Abstract: The effect of sodium-modification on the catalyst and electrocatalytic properties of a platinum catalyst supported on a YSZ solid electrolyte was studied. Increasing the sodium coverage on the catalyst surface appears to block some of the three-phase boundary (tpb) sites and reduces the rate of the charge transfer reaction. The promotion of the platinum surface reaction (ethylene oxidation) seems to a first approximation to be a function of the rate of oxygen supply or removal to or from the surface irrespective of whether this is contaminated by sodium or not (samples with sodium contamination require a higher overpotential to achieve the same current density as a clean sample because of poisoning in the tpb). At high negative polarisations (oxygen removed from the surface) the sodium contaminated samples show a significant increase in rate, possibly due to the decomposition of e.g. sodium hydroxides and carbonates. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 01672738
- Volume :
- 225
- Database :
- Academic Search Index
- Journal :
- Solid State Ionics
- Publication Type :
- Academic Journal
- Accession number :
- 82679509
- Full Text :
- https://doi.org/10.1016/j.ssi.2012.04.023