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The role of sodium surface species on oxygen charge transfer in the Pt/YSZ system

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Main Authors: Naimah, Ibrahim, Poulidi, Danai, Rivas, Maria Elena, Baikie, Iain D., Ian S., Metcalfe
Other Authors: naimah@unimap.edu.my
Format: Article
Language:English
Published: Elsevier Limited 2016
Subjects:
Cyclic voltammetry
Kelvin probe
Oxygen charge transfer
Pt/YSZ system
Sodium surface impurities
Online Access:http://dspace.unimap.edu.my:80/xmlui/handle/123456789/41174
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spelling my.unimap-411742016-03-21T10:59:51Z The role of sodium surface species on oxygen charge transfer in the Pt/YSZ system Naimah, Ibrahim Poulidi, Danai Rivas, Maria Elena Baikie, Iain D. Ian S., Metcalfe naimah@unimap.edu.my i.metcalfe@ncl.ac.uk Cyclic voltammetry Kelvin probe Oxygen charge transfer Pt/YSZ system Sodium surface impurities Link to publisher's homepage at http://www.journals.elsevier.com The role of sodium surface species in the modification of a platinum (Pt) catalyst film supported on 8 mol% yttria-stabilised-zirconia (YSZ) was investigated under a flow of 20 kPa oxygen at 400°C. Cyclic and linear sweep voltammetry were used to investigate the kinetics of the oxygen charge transfer reaction. The Pt/YSZ systems of both 'clean' and variable-coverage sodium-modified catalyst surfaces were also characterised using SEM, XPS and work function measurements using the Kelvin probe technique. Samples with sodium coverage from 0.5 to 100% were used. It was found that sodium addition modifies the binding energy of oxygen onto the catalyst surface. Cyclic voltammetry experiments showed that higher overpotentials were required for oxygen reduction with increasing sodium coverage. In addition, sodium was found to modify oxygen storage and/or adsorption and diffusion increasing current densities at higher cathodic overpotential. Ex situ XPS measurements showed the presence of sodium hydroxide, carbonate and/or oxide species on the catalyst surface, while the Kelvin probe technique showed a decrease of approximately 250 meV in the work function of samples with more than 50% sodium coverage (compared to a nominally 'clean' sample). 2016-03-21T10:59:50Z 2016-03-21T10:59:50Z 2012-08-01 Article Electrochimica Acta, vol.76, 2012, pages 112-119 0013-4686 http://dspace.unimap.edu.my:80/xmlui/handle/123456789/41174 http://dx.doi.org/10.1016/j.electacta.2012.04.160 en Elsevier Limited
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
Kelvin probe
Oxygen charge transfer
Pt/YSZ system
Sodium surface impurities
spellingShingle Cyclic voltammetry
Kelvin probe
Oxygen charge transfer
Pt/YSZ system
Sodium surface impurities
Naimah, Ibrahim
Poulidi, Danai
Rivas, Maria Elena
Baikie, Iain D.
Ian S., Metcalfe
The role of sodium surface species on oxygen charge transfer in the 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
Poulidi, Danai
Rivas, Maria Elena
Baikie, Iain D.
Ian S., Metcalfe
format Article
author Naimah, Ibrahim
Poulidi, Danai
Rivas, Maria Elena
Baikie, Iain D.
Ian S., Metcalfe
author_sort Naimah, Ibrahim
title The role of sodium surface species on oxygen charge transfer in the Pt/YSZ system
title_short The role of sodium surface species on oxygen charge transfer in the Pt/YSZ system
title_full The role of sodium surface species on oxygen charge transfer in the Pt/YSZ system
title_fullStr The role of sodium surface species on oxygen charge transfer in the Pt/YSZ system
title_full_unstemmed The role of sodium surface species on oxygen charge transfer in the Pt/YSZ system
title_sort role of sodium surface species on oxygen charge transfer in the pt/ysz system
publisher Elsevier Limited
publishDate 2016
url http://dspace.unimap.edu.my:80/xmlui/handle/123456789/41174
_version_ 1643799600021110784
score 13.214268

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