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


Autoria(s): Ibrahim, Naimah; Jalil, Mas Rahayu; Poulidi, Danai; Metcalfe, Ian S.
Data(s)

04/10/2012

Resumo

<p>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. © 2012 Elsevier B.V.</p>

Identificador

http://pure.qub.ac.uk/portal/en/publications/the-role-of-low-coverage-sodium-surface-species-on-electrochemical-promotion-in-a-ptysz-system(a4d7dbc1-184a-4739-a04e-7648685c73aa).html

http://dx.doi.org/10.1016/j.ssi.2012.04.023

http://www.scopus.com/inward/record.url?scp=84867582752&partnerID=8YFLogxK

Idioma(s)

eng

Direitos

info:eu-repo/semantics/restrictedAccess

Fonte

Ibrahim , N , Jalil , M R , Poulidi , D & Metcalfe , I S 2012 , ' The role of low coverage sodium surface species on electrochemical promotion in a Pt/YSZ system ' Solid State Ionics , vol 225 , pp. 386-389 . DOI: 10.1016/j.ssi.2012.04.023

Palavras-Chave #Cyclic voltammetry #EPOC #Ethylene oxidation #Na species #Oxygen charge transfer #Pt #YSZ #/dk/atira/pure/subjectarea/asjc/2500 #Materials Science(all) #/dk/atira/pure/subjectarea/asjc/3100/3104 #Condensed Matter Physics #/dk/atira/pure/subjectarea/asjc/1600 #Chemistry(all)
Tipo

article