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

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Main Authors: Naimah, Ibrahim, Mas Rahayu, Jalil, Poulidi, Danai, Ian S., Metcalfe
Other Authors: naimah@unimap.edu.my
Format: Article
Language:English
Published: Elsevier B.V. 2016
Subjects:
Cyclic voltammetry
EPOC
Ethylene oxidation
Na species
Oxygen charge transfer
Pt
YSZ
Online Access:http://dspace.unimap.edu.my:80/xmlui/handle/123456789/41172
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spelling my.unimap-411722016-03-21T10:37:22Z The role of low coverage sodium surface species on electrochemical promotion in a Pt/YSZ system Naimah, Ibrahim Mas Rahayu, Jalil Poulidi, Danai Ian S., Metcalfe naimah@unimap.edu.my ian.metcalfe@newcastle.ac.uk Cyclic voltammetry EPOC Ethylene oxidation Na species Oxygen charge transfer Pt YSZ Link to publisher's homepage at http://www.journals.elsevier.com 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. 2016-03-21T10:37:22Z 2016-03-21T10:37:22Z 2012-10-04 Article Solid State Ionics, vol.225, 2012, pages 386-389 0167-2738 http://dspace.unimap.edu.my:80/xmlui/handle/123456789/41172 10.1016/j.ssi.2012.04.023 en Elsevier B.V.
institution Universiti Malaysia Perlis
building UniMAP Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Perlis
content_source UniMAP Library Digital Repository
url_provider http://dspace.unimap.edu.my/
language English
topic Cyclic voltammetry
EPOC
Ethylene oxidation
Na species
Oxygen charge transfer
Pt
YSZ
spellingShingle Cyclic voltammetry
EPOC
Ethylene oxidation
Na species
Oxygen charge transfer
Pt
YSZ
Naimah, Ibrahim
Mas Rahayu, Jalil
Poulidi, Danai
Ian S., Metcalfe
The role of low coverage sodium surface species on electrochemical promotion in a Pt/YSZ system
description Link to publisher's homepage at http://www.journals.elsevier.com
author2 naimah@unimap.edu.my
author_facet naimah@unimap.edu.my
Naimah, Ibrahim
Mas Rahayu, Jalil
Poulidi, Danai
Ian S., Metcalfe
format Article
author Naimah, Ibrahim
Mas Rahayu, Jalil
Poulidi, Danai
Ian S., Metcalfe
author_sort Naimah, Ibrahim
title The role of low coverage sodium surface species on electrochemical promotion in a Pt/YSZ system
title_short The role of low coverage sodium surface species on electrochemical promotion in a Pt/YSZ system
title_full The role of low coverage sodium surface species on electrochemical promotion in a Pt/YSZ system
title_fullStr The role of low coverage sodium surface species on electrochemical promotion in a Pt/YSZ system
title_full_unstemmed The role of low coverage sodium surface species on electrochemical promotion in a Pt/YSZ system
title_sort role of low coverage sodium surface species on electrochemical promotion in a pt/ysz system
publisher Elsevier B.V.
publishDate 2016
url http://dspace.unimap.edu.my:80/xmlui/handle/123456789/41172
_version_ 1643799599420276736
score 13.214268

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