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On the absence of a beneficial role of Rh towards C C bond cleavage during low temperature ethanol electrooxidation on PtRh nanoalloys

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cris.lastimport.scopus2024-02-12T20:04:25Z
dc.abstract.enNumerous reports in scientific literature claim the increased activity of Rh-containing systems towards C-C bond scission in the electrocatalytic oxidation of ethanol at ambient temperatures. Due to the claimed C-C bond breaking ability, Rh-containing systems are intensively investigated and widely recognized as the most promising candidates for anode materials in ethanol-feed low temperature fuel cells. Contrary to those claims, we determined that the surfacenormalized amounts of CO2 produced during ethanol oxidation are comparable on Pt, Rh and PtRh nanoalloys, and smaller than CO2 amounts obtained on exactly the same electrode when a monolayer of adsorbed CO is being oxidized. The whole amount of CO2 detected during ethanol oxidation, regardless of Rh presence or lack of thereof, seems to come exclusively fromoxidation of submonolayer of COads produced fromethanol, undergoing dissociative adsorption of ethanol at low electrode potential, and its subsequent oxidation at sufficiently high electrode potential. Our work suggests that Rh-containing alloys are not more active towards C-C bond scission than pure Pt, and on both metals the mechanism of oxidation of ethanol to CO2 roceeds via the submonolayer of COads, which limits the quantity of CO2 produced from ethanol at room temperature to negligible amount. Additionally, based on critical literature analysis we determined that the higher activity of Rh-containing materials towards C-C bond scission claimed in literature, was an over-interpretation of data.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorLewera, Adam
dc.contributor.authorPiwowar, Justyna
dc.date.accessioned2024-01-25T15:45:51Z
dc.date.available2024-01-25T15:45:51Z
dc.date.copyright2020-05-25
dc.date.issued2020
dc.description.accesstimeAT_PUBLICATION
dc.description.financePublikacja bezkosztowa
dc.description.versionFINAL_PUBLISHED
dc.description.volume875
dc.identifier.doi10.1016/J.JELECHEM.2020.114229
dc.identifier.issn1572-6657
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/114767
dc.identifier.weblinkhttps://api.elsevier.com/content/article/PII:S1572665720304574?httpAccept=text/xml
dc.languageeng
dc.pbn.affiliationchemical sciences
dc.relation.ispartofJournal of Electroanalytical Chemistry
dc.relation.pages114229
dc.rightsCC-BY
dc.sciencecloudnosend
dc.subject.enEthanol oxidation
dc.subject.enCarbon-carbon bond scission
dc.subject.enElectrocatalysis
dc.subject.enPlatinum
dc.subject.enRhodium
dc.titleOn the absence of a beneficial role of Rh towards C C bond cleavage during low temperature ethanol electrooxidation on PtRh nanoalloys
dc.typeJournalArticle
dspace.entity.typePublication