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Lookup NU author(s): Dr Naimah Ibrahim, Mas Jalil, Dr Danai Poulidi, Professor Ian Metcalfe
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. (C) 2012 Elsevier B.V. All rights reserved.
Author(s): Ibrahim N, Jalil MR, Poulidi D, Metcalfe IS
Publication type: Conference Proceedings (inc. Abstract)
Publication status: Published
Conference Name: 18th International Conference on Solid State Ionics (SSI)
Year of Conference: 2012
Pages: 386-389
Date deposited: 28/03/2013
ISSN: 0167-2738
Publisher: Elsevier BV
URL: http://dx.doi.org/10.1016/j.ssi.2012.04.023
DOI: 10.1016/j.ssi.2012.04.023
Library holdings: Search Newcastle University Library for this item
Series Title: Solid State Ionics
ISBN: 18727689
