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Elektrokatalitičke osobine nanočestica legura PtRu/C u oksidaciji malih organskih molekula - poređenje sa katalizatorom Pt/C

dc.creatorLović, Jelena
dc.creatorPopović, Ksenija
dc.creatorTripković, Amalija
dc.date.accessioned2019-01-30T17:32:10Z
dc.date.available2019-01-30T17:32:10Z
dc.date.issued2012
dc.identifier.issn0367-598X
dc.identifier.urihttp://cer.ihtm.bg.ac.rs/handle/123456789/1085
dc.description.abstractThe electrocatalytic activity of carbon supported PtRu/C catalysts, with different composition, toward the electrooxidation of methanol, CO and formic acid were examined in acid and alkaline solution at ambient temperature using the thin-film rotating disk electrode (RDE) method and compared with activity of Pt/C. The catalysts were characterized by XRD, AFM and STM techniques. XRD pattern revealed that PtRu-1/C catalyst is consisted of two structures e.g. Pt-Ru-fcc and Ru-hcp (the solid solution of Ru in Pt and the small amount of Ru or solid solution of Pt in Ru), as opposed to PtRu-2/C catalyst which is consisted of one structure mostly, Pt-Ru-fcc. According to STM images, PtRu as well as Pt, the particle sizes ranged between 2 and 6 nm, which is in a good agreement with the mean particles size determined by XRD. To establish the activity and stability of the catalysts potentiodynamic and quasi steady-state measurements were performed. It was found that the activity of Pt and PtRu for CO and methanol oxidation is a strong function of pH of solution. The kinetics are much faster in alkaline than in acid solution and the difference between Pt/C and PtRu/C is much less pronounced in alkaline media. The results presented in this work indicate that the activity of PtRu catalysts depends on catalyst composition, e.g., on the Pt/Ru atomic ratio, as well as on the alloying degree of catalysts. Comparison of CO, methanol and formic acid oxidation on PtRu-2/C, PtRu-1/C and Pt/C catalysts revealed that PtRu-2/C is the most active one. It was shown that the PtRu-2/C catalyst, due to fact that it consists of only one phase, with a high alloying degree, through the bifunctional mechanism improved by the electronic effect, achieved activity twice as high as PtRu-1/C in oxidation of all organic molecules investigated, and about three times higher than Pt/C in the oxidation of methanol and CO, and five times higher in formic acid oxidation.en
dc.description.abstractOksidacija metanola, mravlje kiseline i ugljen monoksida ispitivana je na nanočesticama različitih legura PtRu (PtRu/C), i dobijene aktivnosti su upoređene sa aktivnostima na nanostrukturnom platinskom katalizatoru (Pt/C). Katalizatori su okarakterisani difrakcijom X-zraka (XRD) i mikroskopskim tehnikama: mikroskopijom atomskih sila (AFM) i skenirajućom tunelirajućom mikroskopijom (STM). Elektrokatalitičke osobine svih katalizatora ispitivane su potenciodinamičkim i kvazi-stacionarnim merenjima u alkalnoj i kiseloj sredini. Pokazano je da su odgovarajuće elektrode za red veličine aktivnije u alkalnoj u odnosu na kiselu sredinu. Takođe, razlika u aktivnosti između Pt/C i obe PtRu/C elektrode je manje izražena u alkalnoj sredini. Rezultati elektrohemijskih merenja pokazali su da aktivnost katalizatora PtRu/C zavisi od sastava tj. određena je odgovarajućim Pt/Ru odnosom i stepenom legiranja. Tako je za oksidaciju malih organskih molekula elektroda PtRu-2/C aktivnija od PtRu-1/C. Prisustvo jedne faze u katalizatoru PtRu-2/C, veći stepen legiranja, više Pt/Ru parova čini da ovaj katalizator ima oko dva puta veću aktivnost u svim posmatranim reakcijama u odnosu na PtRu-1/C i oko tri puta u odnosu na Pt/C za oksidaciju metanola i CO, odnosno pet puta za oksidaciju mravlje kiseline.sr
dc.publisherAssociation of Chemical Engineers of Serbia
dc.relationinfo:eu-repo/grantAgreement/MESTD/Basic Research (BR or ON)/172060/RS//
dc.rightsopenAccess
dc.sourceHemijska industrija
dc.subjectelectrochemical oxidationen
dc.subjectmethanolen
dc.subjectcarbon supported platinum ruthenium catalystsen
dc.subjectcarbon supported platinum catalystsen
dc.subjectXRDen
dc.subjectAFMen
dc.subjectSTMen
dc.subjectelektrohemijska oksidacijasr
dc.subjectmetanolsr
dc.subjectnančestice legure PtRu/Csr
dc.subjectPt/C katalizatorsr
dc.subjectXRDsr
dc.subjectAFMsr
dc.subjectSTMsr
dc.titleThe electrocatalytic properties of carbon supported PtRu/C nanoalloys in oxidation of small organic molecules: Comparison with Pt/C catalysten
dc.titleElektrokatalitičke osobine nanočestica legura PtRu/C u oksidaciji malih organskih molekula - poređenje sa katalizatorom Pt/Csr
dc.typearticle
dc.rights.licenseBY-NC-ND
dcterms.abstractПоповић, Ксенија; Ловић, Јелена; Трипковић, Aмалија В.; Електрокаталитичке особине наночестица легура ПтРу/Ц у оксидацији малих органских молекула - поређење са катализатором Пт/Ц; Електрокаталитичке особине наночестица легура ПтРу/Ц у оксидацији малих органских молекула - поређење са катализатором Пт/Ц;
dc.citation.volume66
dc.citation.issue3
dc.citation.spage335
dc.citation.epage347
dc.citation.other66(3): 335-347
dc.citation.rankM23
dc.identifier.doi10.2298/HEMIND111018104L
dc.identifier.rcubConv_422
dc.identifier.fulltexthttp://cer.ihtm.bg.ac.rs//bitstream/id/7639/1083.pdf
dc.identifier.scopus2-s2.0-84865653113
dc.identifier.wos000310493000006
dc.type.versionpublishedVersion


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