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master's thesis
Priprava kompozita metalni oksid/grafen i njegova primjena u superkondenzatorima
Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology, 2017. urn:nbn:hr:149:072117
Kralj, Magdalena
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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Kralj, M. (2017). Priprava kompozita metalni oksid/grafen i njegova primjena u superkondenzatorima (Master's thesis). Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology. Retrieved from https://urn.nsk.hr/urn:nbn:hr:149:072117

Kralj, Magdalena. "Priprava kompozita metalni oksid/grafen i njegova primjena u superkondenzatorima." Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, 2017. https://urn.nsk.hr/urn:nbn:hr:149:072117

Kralj, Magdalena. "Priprava kompozita metalni oksid/grafen i njegova primjena u superkondenzatorima." Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, 2017. https://urn.nsk.hr/urn:nbn:hr:149:072117

Kralj, M. (2017). 'Priprava kompozita metalni oksid/grafen i njegova primjena u superkondenzatorima', Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, accessed 29 November 2024, https://urn.nsk.hr/urn:nbn:hr:149:072117

Kralj M. Priprava kompozita metalni oksid/grafen i njegova primjena u superkondenzatorima [Master's thesis]. Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology; 2017 [cited 2024 November 29] Available at: https://urn.nsk.hr/urn:nbn:hr:149:072117

M. Kralj, "Priprava kompozita metalni oksid/grafen i njegova primjena u superkondenzatorima", Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, Zagreb, 2017. Available at: https://urn.nsk.hr/urn:nbn:hr:149:072117

Metadata
TitlePriprava kompozita metalni oksid/grafen i njegova primjena u superkondenzatorima
Title (english)Preparation of metal oxide/graphene composite and its application as active electrode material in supercapacitors
AuthorMagdalena Kralj
MentorMarijana Kraljić Roković (mentor)
Committee memberMarijana Kraljić Roković (predsjednik povjerenstva)
Committee memberZoran Mandić (član povjerenstva)
Committee memberTatjana Gazivoda Kraljević (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Chemical Engineering and Technology
Zagreb
Defense date and country2017-09-26, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Chemical Engineering
Chemical Engineering in Material Development
Abstract
Svrha ovog rada bila je priprema i karakterizacija kompozitnog materijala grafen/SnO2 hidrotermalnom sintezom potpomognutom mikrovalovima i klasičnom hidrotermalnom sintezom. Jedan od ciljeva ovog rada ujedno je bio i priprava i karakterizacija superkondenzatora koji se temelje na grafen/SnO2 aktivnim materijalima. Tijekom hidrotermalne metode potpomognute mikrovalovima produkt je dobiven u obliku suspendiranih čestica. dok je tijekom klasične hidrotermalne sinteze dobiven hidrogel. Kapacitivna svojstva uzoraka sintetiziranih u mikrovalnom reaktoru ispitana su korištenjem metode cikličke voltametrije i elektrokemijske impedancijske spektroskopije pri čemu je dokazano da KOMPOZIT 1, KOMPOZIT 2 i KOMPOZIT 3 karakteriziraju odlična kapacitivna svojstva. uz dobivene vrijednosti specifičnog kapaciteta od 3,51 do 91,94 Fg^-1. Kao najbolji pristup sintezi pokazao se postupak kojim je dobiven KOMPOZIT 2 stoga je navedeni pristup korišten tijekom hidrotermalne sinteze. U hidrotermalnoj sintezi su dobivena tri različita kompozita u obliku hidrogela (KOMPOZIT 21, KOMPOZIT 22 i KOMPOZIT 23) te su iz navedenih hidrogelova direktno priređeni superkondenzatori (Superkondenzator 1, Superkondenzator 3, Superkondenzator 2). Najbolja svojstva je pokazao Superkondenzator 3 kod kojeg je zabilježen specifični kapacitet od 55,92 F g^-1 te specifičnu energiju od 71,58 Ws g^-1. Uvid u morfologiju i sastav uzoraka dobiven je SEM snimkama koje pokazuju da je za KOMPOZIT 2 dobiven najveći udio SnO2 te da je sloj najhomogeniji. Kod hidrogelova je dokazana porozna struktura koja osigurava visoke kapacitete. XPS analizom uzoraka potvrđeno je da je došlo do redukcije grafenova oksida (GO) u grafen (rGO) i oksidacije Sn2+ u Sn4+. FTIR spektroskopijom dokazano je prisustvo određenih kisikovih funkcionalnih skupina kao i prisustvo –Sn-O- veze. Provedbom rendgenske difrakcije vidljivi su i karakteristični maksimumi koji odgovaraju strukturi SnO2. Navedene metode su dokazale da je tijekom sinteze doista došlo do formiranja kompozitnog materijala grafen/SnO2.
Abstract (english)
The main purpose of this theses was the preparation and characterization of the composite material graphene/SnO2 using microwave-assisted hydrothermal synthesis and convencional hydrothermal synthesis. One of the aims of these theses was also the preparation and characterization of supercapacitors based on graphene/SnO2 active materials. The suspended particels were obtained using microwave-assisted hydrothermal synthesis, while hydrogel was obtained using classical hydrothermal synthesis. The capacitive properties of the samples prepared by microwave assisted method were examine using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS), which proven excellent capacitive properties of COMPOSITE 1, COMPOSITE 2 and COMPOSITE 3 were specific capacity values 3.51 - 91.94 Fg^-1 were obtained. The process of obtaining COMPOSITE 2 shown to be the best approach for synthesis and therefore it has been used during hydrothermal synthesis. In the hydrothermal synthesis three different composites were obtained in the form of hydrogels (COMPOSITE 21, COMPOSITE 22 and COMPOSITE 23) and supercapacitors (Supercapacitor 1, Supercapacitor 3 and Supercapacitor 2) were directly prepared by using these hydrogels. Supercapacitor 3 has shown the best properties were specific capacitance, 55.92 Fg^-1 and specific energy, 71.58 Ws g^-1 were recorded. Insight into morphology and composition of the materials was obtain by SEM technique showing that COMPOSITE 2 is the most homogeneous material, with the largest amount of SnO2. The porous structure is determine for hydrogels that provides high capacitance values. XPS analysis of the samples comfirmed reduction of graphene oxide (GO) to graphene (rGO) and oxidation Sn2+ in Sn4+. FTIR spectroscopy showed the presence of oxygen functional groups, as well as the presence of a –Sn-O- bonding. Using X-ray diffraction, the characteristic maximums corresponding to the SnO2 structure are visible. The methods used in this work have confirmed that graphene/SnO2 composite was obtained.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:149:072117
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 on2020-04-22 14:20:11