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master's thesis
Priprava i karakterizacija kompozita MnO2/grafen za primjenu u superkondenzatorima
Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology, 2015. urn:nbn:hr:149:016973
Lutvica, Alen
University of Zagreb
Faculty of Chemical Engineering and Technology

Institutional repository: Repository of Faculty of Chemical Engineering and Technology University of Zagreb

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Lutvica, A. (2015). Priprava i karakterizacija kompozita MnO2/grafen za primjenu u superkondenzatorima (Master's thesis). Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology. Retrieved from https://urn.nsk.hr/urn:nbn:hr:149:016973

Lutvica, Alen. "Priprava i karakterizacija kompozita MnO2/grafen za primjenu u superkondenzatorima." Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, 2015. https://urn.nsk.hr/urn:nbn:hr:149:016973

Lutvica, Alen. "Priprava i karakterizacija kompozita MnO2/grafen za primjenu u superkondenzatorima." Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, 2015. https://urn.nsk.hr/urn:nbn:hr:149:016973

Lutvica, A. (2015). 'Priprava i karakterizacija kompozita MnO2/grafen za primjenu u superkondenzatorima', Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, accessed 22 November 2024, https://urn.nsk.hr/urn:nbn:hr:149:016973

Lutvica A. Priprava i karakterizacija kompozita MnO2/grafen za primjenu u superkondenzatorima [Master's thesis]. Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology; 2015 [cited 2024 November 22] Available at: https://urn.nsk.hr/urn:nbn:hr:149:016973

A. Lutvica, "Priprava i karakterizacija kompozita MnO2/grafen za primjenu u superkondenzatorima", Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, Zagreb, 2015. Available at: https://urn.nsk.hr/urn:nbn:hr:149:016973

Metadata
TitlePriprava i karakterizacija kompozita MnO2/grafen za primjenu u superkondenzatorima
Title (english)Preparation and characterisation of MnO2/graphene composites for supercapacitor application
AuthorAlen Lutvica
MentorMarijana Kraljić Roković (mentor)
Committee memberMarijana Kraljić Roković (predsjednik povjerenstva)
Committee memberZoran Mandić (član povjerenstva)
Committee memberIva Movre Šapić (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Chemical Engineering and Technology
Zagreb
Defense date and country2015-11-27, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Chemical Engineering
Chemical Engineering in Material Development
Abstract
U ovome radu su pripremljene i okarakterizirane elektrode grafena i kompozita grafen/manganov oksid. Grafen je pripremljen redukcijom grafen oksida s NaBH4. Dobiveni produkt je nanesen na površinu staklastog ugljika sam (GBV1, GBV2) ili u kombinaciji s vezivom (GV2, GV3). Količina grafena koja je nanesena je varirala s ciljem da se utvrdi ovisnost svojstva elektrode o količini nanesenog materijala. Ispitivanje grafenom modificirane elektrode je provedeno metodom cikličke votametrije u 0,5 mol dm^-3 otopini Na2SO4, te pretražnim elektronskim mikroskopom (SEM). Prilikom ispitivanja elektrode metodom cikličke voltametrije u svim slučajevima dobivena je gotovo konstantna struja po potencijalu što ukazuje na dobra kapacitivna svojstva. Veći specifični kapaciteti su dobiveni u slučajevima kada nije korišteno vezivo. Na grafen modificiranim elektrodama provedena je kronoamperometrijska depozicija MnO2 Dobiveni kompoziti su ispitani metodom cikličke voltametrije u 0,5 mol dm^-3 otopini Na2SO4 te u otopini iz koje je provedena sinteza odnosno u prisutnosti Mn2+ iona. U svim slučajevima su dobivena dobra pseudokapacitivna svojstva te su dobiveni nešto veći kapaciteti u otopini MnSO4 u odnosu na Na2SO4 otopinu. Različito ponašanje je posljedica razlike u veličini kationa koji se interkalira tijekom redoks reakcije. Veće vrijednosti specifičnih kapaciteta su također dobivene za tanje slojeve manganovog oksida te kod grafen modificiranih elektroda kod kojih je korišteno vezivo. Dobivene vrijednosti specifičnih kapaciteta su se kretale u rasponu od 324-51 Fg^-1.
Abstract (english)
In this work samples of graphene and graphene/manganese oxide were prepared and characterised. Graphene was prepared by graphene oxide reduction using NaBH4. The obtained product was applied to the glassy carbon surface with or without the binder. The amount of graphene is varied in order to find out the dependence of properties on the amount of active material. The electrodes prepared in this manner were tested by cyclic voltammetry method in 0.5 mol dm^-3 NaSO4 solution and by scanning electronic microscopy (SEM). In all cases good capacitive properties were obtained. Higher capacitance was obtained when no binder was used. The graphene modified electrode was used as a support for chronoamperometry deposition of MnO2. The obtained electrodes were examined by cyclic voltammetry method in 0.5 mol dm^-3 NaSO4 and 0.25 mol dm^-3 MnSO4 solution whereat good pseudocapacitive properties were obtained in both systems. Due to the smaller Mn2+ size a higher amount of cations is intercalated within the layer and higher pseudocapacitive values are obtained in MnSO4 solution. Additionally, higher pseudocapacitive values of MnO2 are obtained for thinner layers and when graphene with binder was used. The obtained specific capacitance values ranges between 324 and 51 F g^-1.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:149:016973
Study programmeTitle: Applied Chemistry - Graduate study; specializations in: Environmental chemistry and green technologies, Advanced materials and technologies, Applied organic chemistry
Course: Advanced materials and technologies
Study programme type: university
Study level: graduate
Academic / professional title: magistar/magistra primijenjene kemije (magistar/magistra primijenjene kemije)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2017-03-20 13:47:49