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The role of low coverage sodium surface species on electrochemical promotion in a Pt/YSZ system

Lookup NU author(s): Dr Naimah Ibrahim, Mas Jalil, Dr Danai Poulidi, Professor Ian Metcalfe

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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. (C) 2012 Elsevier B.V. All rights reserved.


Publication metadata

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


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