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dc.creatorKrstajić, Nedeljko
dc.creatorElezović, Nevenka R.
dc.creatorVračar, Ljiljana
dc.creatorGajić Krstajić, Ljiljana
dc.creatorRadmilović, Velimir R.
dc.date.accessioned2019-03-01T13:05:55Z
dc.date.available2019-03-01T13:05:55Z
dc.date.issued2009
dc.identifier.isbn978-86-80321-18-9
dc.identifier.urihttp://dais.sanu.ac.rs/123456789/4956
dc.description.abstractDue to the importance of the HOR in fuel-cells technology, various Pt-based catalysts have been examined from the viewpoint of immunity of the electrocatalysis of the HOR from CO-poisoning of the anode catalysts. An appreciable improvement of the CO tolerance has been found at Pt with adatoms such as Ru, Sn [1,2], Pt-M (M=Ru, Rh, Os, W Sn) [3-5] based alloys, and Pt with oxides (RuOxHy) [6]. In the present work, the electrocatalytic of home made highly dispersed nano-sized MoOx-Pt/C catalysts prepared by the polyole method combined by MoOx post-deposition was investigated in the presence of CO, in 0.5 moldm-3 HClO4 solution. The partial pressure of CO in CO/H2 gas mixture was 100 ppm. Carbon monoxide was adsorbed on the RDE for various time interval with keeping the potential at 0.05 V (RHE). The coverage of CO was determined by applying the first potential sweep (from 0.04 to 1.20 V), in N2 saturated solution at potential scan rate of 0.1 Vs-1 and compared it with the sweep on the clean electrode, by measuring the decrease in the hydrogen desorption charge, ΔQH. MoOx(20%)Pt/C catalyst exhibits an excellent CO tolerance, as it was found that the reduction in kinetic current, Ik, is negligible even at ΘCO = 0.46. It was found for this catalyst too, that the CO adsorption rate was much slower than that of Pt and the Pt sites for HOR were not so rigidly blocked by adsorbed CO partially due to its enhanced mobility, resulting from their modified electronic structure of surface Pt sites. Voltammetric studies suggest that an excellent CO tolerance of this catalyst could be also result of the oxidation of adsorbed CO to CO2 by oxophilic MoOx species at low overpotentials by a redox-mediated mechanism.en
dc.language.isoensr
dc.publisherBelgrade : Institute of Technical Sciences of SASAsr
dc.relationinfo:eu-repo/grantAgreement/MESTD/MPN2006-2010/142038/RS//sr
dc.rightsopenAccesssr
dc.sourceProgramme and The Book of Abstracts / Eleventh Annual Conference YUCOMAT 2009, Herceg Novi, August 31 – September 4, 2009sr
dc.subjectPt-based catalystssr
dc.subjectelectrocatalysissr
dc.subjectcarbon monoxidesr
dc.subjectplatinumsr
dc.subjecthydrogen oxidationsr
dc.titleKinetics of the hydrogen oxidation on pt modified MoOx nano-sized catalyst in the presence of carbon monoxideen
dc.typeconferenceObjectsr
dc.rights.licenseBY-NC-NDsr
dcterms.abstractВрачар, Љиљана; Крстајић, Недељко В.; Елезовић, Невенка Р.; Гајић Крстајић, Љиљана; Радмиловић, Велимир Р.;
dc.citation.spage85
dc.citation.epage85
dc.description.otherPoster: [http://dais.sanu.ac.rs/handle/123456789/266]sr
dc.type.versionpublishedVersionsr
dc.identifier.fulltexthttp://dais.sanu.ac.rs/bitstream/id/15672/bitstream_15672.pdf


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