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The electrocatalytic properties of carbon supported PtRu/C nanoalloys in oxidation of small organic molecules: Comparison with Pt/C catalyst
Elektrokatalitičke osobine nanočestica legura PtRu/C u oksidaciji malih organskih molekula - poređenje sa katalizatorom Pt/C
dc.creator | Lović, Jelena | |
dc.creator | Popović, Ksenija | |
dc.creator | Tripković, Amalija | |
dc.date.accessioned | 2019-01-30T17:32:10Z | |
dc.date.available | 2019-01-30T17:32:10Z | |
dc.date.issued | 2012 | |
dc.identifier.issn | 0367-598X | |
dc.identifier.uri | https://cer.ihtm.bg.ac.rs/handle/123456789/1085 | |
dc.description.abstract | The 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.abstract | Oksidacija 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.publisher | Association of Chemical Engineers of Serbia | |
dc.relation | info:eu-repo/grantAgreement/MESTD/Basic Research (BR or ON)/172060/RS// | |
dc.rights | openAccess | |
dc.rights.uri | https://creativecommons.org/licenses/by-nc-nd/4.0/ | |
dc.source | Hemijska industrija | |
dc.subject | electrochemical oxidation | en |
dc.subject | methanol | en |
dc.subject | carbon supported platinum ruthenium catalysts | en |
dc.subject | carbon supported platinum catalysts | en |
dc.subject | XRD | en |
dc.subject | AFM | en |
dc.subject | STM | en |
dc.subject | elektrohemijska oksidacija | sr |
dc.subject | metanol | sr |
dc.subject | nančestice legure PtRu/C | sr |
dc.subject | Pt/C katalizator | sr |
dc.subject | XRD | sr |
dc.subject | AFM | sr |
dc.subject | STM | sr |
dc.title | The electrocatalytic properties of carbon supported PtRu/C nanoalloys in oxidation of small organic molecules: Comparison with Pt/C catalyst | en |
dc.title | Elektrokatalitičke osobine nanočestica legura PtRu/C u oksidaciji malih organskih molekula - poređenje sa katalizatorom Pt/C | sr |
dc.type | article | |
dc.rights.license | BY-NC-ND | |
dcterms.abstract | Поповић, 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.volume | 66 | |
dc.citation.issue | 3 | |
dc.citation.spage | 335 | |
dc.citation.epage | 347 | |
dc.citation.other | 66(3): 335-347 | |
dc.citation.rank | M23 | |
dc.identifier.doi | 10.2298/HEMIND111018104L | |
dc.identifier.fulltext | https://cer.ihtm.bg.ac.rs//bitstream/id/7639/1083.pdf | |
dc.identifier.scopus | 2-s2.0-84865653113 | |
dc.identifier.wos | 000310493000006 | |
dc.type.version | publishedVersion |