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Fotoelektrohemijska ćelija na bazi nanocevi titan-dioksida modifikovanih gvožđe oksidom.

dc.contributor.advisorGrgur, Branimir
dc.contributor.otherGvozdenović, Milica
dc.contributor.otherJugović, Branimir
dc.creatorOmymen, Waleed Mohammed
dc.date.accessioned2018-11-07T15:57:53Z
dc.date.available2018-11-07T15:57:53Z
dc.date.available2020-07-03T09:24:49Z
dc.date.issued2018-05-10
dc.identifier.urihttp://eteze.bg.ac.rs/application/showtheses?thesesId=6049
dc.identifier.urihttp://nardus.mpn.gov.rs/handle/123456789/10090
dc.identifier.urihttps://fedorabg.bg.ac.rs/fedora/get/o:18383/bdef:Content/download
dc.identifier.urihttp://vbs.rs/scripts/cobiss?command=DISPLAY&base=70036&RID=50423311
dc.description.abstractThe fast reaction of forced hydrolysis of iron(III) nitrate in hypochlorite solution at room temperature, leads to the formation of mainly hematite, α-Fe2O3. Successive ion adsorption and reaction (SILAR) is applied to decorate an electrochemically formed TiO2 nanotube electrode. The anodic photoelectrochemical behavior of pure TiO2-NT’s and modified electrodes are investigated in a sulfate containing solution at pH=9.2. It is shown that such a modification leads to an increase of anodic photoactivity, as well as that at the same current density, the photoelectrochemical cell with a modified electrode operates at a voltage lower by 0.7 V. The band gap and flat band potentials are estimated, and the structure of the band gap and possible charge transfer reactions and mechanism are discussed. The electrochemical oxidation of the urea in near neutral pH is investigated on platinum electrode. It is shown that oxidation reaction is practically inhibited up to the potentials of ~0.9 V. The same reaction is investigated onto electrochemically obtained titanium dioxide nanotubes modified by hematite using SILAR method. It is shown that such system possesses electrocatalytic activity at very low potentials, and activity can be further improved by the illumination of the electrode in the photo-assisted reaction. The possible application of the photoactive anode is considered in the application of urea based water electrolysis and urea based fuel cell.sr
dc.description.abstractBrza reakcija prisilne hidrolize gvožđa (III) nitrata u rastvor hipohlorita na sobnoj temperaturi, dovodi do stvaranja uglavnom hematita, α-Fe2O3. Sukcesivna jonska adsorpcija i reakcija (SILAR) primenjena je za modifikaciju elektrohemijski formirane elektrode od TiO2 u obliku nanocevi. Anodno fotoelektrohemijsko ponašanje čistih TiO2-NT i modifikovanih elektroda ispitano je u rastvoru sulfata pri pH = 9.2. Pokazano je da takva modifikacija dovodi do povećanja anodne fotoaktivnosti, kao i da kod iste gustine struje fotoelektrohemijska ćelija sa modifikovanom elektrodom radi na naponu manjem za 0,7 V. Procenjena je vrednost širine energetske barijere i potencijala izravnatih zona. Diskutovano je o strukturi energetske barijere ispitivanih materijala, mogućim reakcijama i mehanizmu prenosa naelektrisanja. Elektrohemijska oksidacija uree u rastvoru pH=9,2 je ispitana na platinskoj elektrodi. Pokazano je da je reakcija oksidacije praktično inhibirana do vrednosti potencijala od ~ 0,9 V. Ista reakcija je ispitana na elektrohemijski dobijenim nanocevima titan-dioksida modifikovanim hematitom koristeći SILAR metodu. Pokazano je da takav sistem poseduje elektrokatalitičku aktivnost pri veoma niskim potencijalima, a aktivnost se može dodatno poboljšati osvetljavanjem elektrode. Moguća primena fotoaktivne anode je razmatrana za primenu u elektrolizi vode na bazi uree i gorivne ćelije na bazi uree.en
dc.formatapplication/pdf
dc.languageen
dc.publisherУниверзитет у Београду, Технолошко-металуршки факултетsr
dc.rightsopenAccessen
dc.sourceУниверзитет у Београдуsr
dc.subjectHematitesr
dc.subjectHematiten
dc.subjectForced hydrolysissr
dc.subjectPhotoelectrochemical cellsr
dc.subjectUreasr
dc.subjectOxidationsr
dc.subjectPrinudna hidrolizaen
dc.subjectFotoelektrohemijska ćelijaen
dc.subjectUreaen
dc.subjectOksidacijaen
dc.titlePhotoelectrochemical cell based on titanium dioxide nanotubes modified by iron oxidesr
dc.title.alternativeFotoelektrohemijska ćelija na bazi nanocevi titan-dioksida modifikovanih gvožđe oksidom.en
dc.typedoctoralThesis
dc.rights.licenseBY-NC-ND
dcterms.abstractГргур, Бранимир; Југовић, Бранимир; Гвозденовић, Милица; Омyмен, Wалеед Мохаммед;
dc.identifier.fulltexthttp://nardus.mpn.gov.rs/bitstream/id/18598/IzvestajKomisije17840.pdf
dc.identifier.fulltexthttp://nardus.mpn.gov.rs/bitstream/id/18597/Disertacija.pdf


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