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undergraduate thesis
Kemijska i elektrokemijska modifikacija grafen oksida
Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology, 2015. urn:nbn:hr:149:424291
Spajić, Ivan
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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Spajić, I. (2015). Kemijska i elektrokemijska modifikacija grafen oksida (Undergraduate thesis). Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology. Retrieved from https://urn.nsk.hr/urn:nbn:hr:149:424291

Spajić, Ivan. "Kemijska i elektrokemijska modifikacija grafen oksida." Undergraduate thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, 2015. https://urn.nsk.hr/urn:nbn:hr:149:424291

Spajić, Ivan. "Kemijska i elektrokemijska modifikacija grafen oksida." Undergraduate thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, 2015. https://urn.nsk.hr/urn:nbn:hr:149:424291

Spajić, I. (2015). 'Kemijska i elektrokemijska modifikacija grafen oksida', Undergraduate thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, accessed 25 November 2024, https://urn.nsk.hr/urn:nbn:hr:149:424291

Spajić I. Kemijska i elektrokemijska modifikacija grafen oksida [Undergraduate thesis]. Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology; 2015 [cited 2024 November 25] Available at: https://urn.nsk.hr/urn:nbn:hr:149:424291

I. Spajić, "Kemijska i elektrokemijska modifikacija grafen oksida", Undergraduate thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, Zagreb, 2015. Available at: https://urn.nsk.hr/urn:nbn:hr:149:424291

Metadata
TitleKemijska i elektrokemijska modifikacija grafen oksida
Title (english)Chemical and electrochemical modification of graphene oxide
AuthorIvan Spajić
MentorZoran Mandić (mentor)
Committee memberZoran Mandić (predsjednik povjerenstva)
Committee memberMirela Leskovac (član povjerenstva)
Committee memberMarijana Kraljić Roković (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Chemical Engineering and Technology
Zagreb
Defense date and country2015-07-10, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Chemical Engineering
Chemical Engineering in Material Development
Abstract
U ovom radu su pripravljene i ispitane četiri različite elektrode od grafen oksida (GO). Sinteza GO-a provedena je iz grafita prema Staudenmaier metodi. Priređeni GO nanešen je na zlatom prevučenu kvarcnu elektrodu te je provedena funkcionalizacija GO-a s anilinom s ciljem priprave i ispitivanja elektroda za potencijalnu primjenu u superkondenzatorima. Pripremljene elektrode se razlikuju prema načinu funkcionalizacije (uz korištenje NHS-EDC reagensa i bez reagensa), te prema ispiranju funkcionaliziranih elektroda (s vodom i s metanolom). Ispitivanja funkcionaliziranih GO elektroda su provedena metodom cikličke voltametrije i pomoću elektrokemijske kvarckristalne nanovage (EQCN). Funkcionalizirani GO je pokazao vrlo dobra elektrokemijska svojstva, dobru vodljivost električne struje, te obećavajuće rezultate za primjenu ovakvih elektroda u superkondenzatorima. Prilikom funkcionalizacije GO-a došlo je do fizikalne adsorpcije anilina na GO-u, a tijekom voltametrijskih i EQCN ispitivanja elektroda dolazi do oksidacije anilina na potencijalima iznad 700 mV prema Hg/Hg2Cl2 referentnoj elektrodi. Kao rezultat oksidacije anilina nastaje produkt čiji strujni vrhovi oksidacije i redukcije kontinuirano rastu s opetovanim ciklusima oksidacije anilina. Dobiveni strujni vrhovi se nalaze na potencijalima na kojima može doći do oksidacije ili dimera anilina (p-aminodifenilamina) ili produkta koji u sebi sadrži fenazenske prstenove. Budući da je elektroda poprimila zelenu boju karakterističnu za polianilin najvjerojatnije je da su se na elektrodi formirali visokomolekularni lanci koji sadrže veliki udio fenazenskih prstenova.
Abstract (english)
In this work four different electrodes based on graphene oxide (GO) were prepared. Graphite was used as the starting material for the GO synthesis according to the Staudenmaier method. The prepared GO was deposited on gold covered quartz crystal electrode and its functionalization by aniline was carried out in order to prepare the electrodes and to test them for the potential use in supercapacitor applications. Four synthesised electrodes differ in the functionalization method (with or without NHS/EDC reagent) and washing approach (water or methanol). The electrodes were tested by cyclic voltammetry method and using quartz crystal nanobalance. Functionalized GO showed excellent electrochemical properties, good electrical conductivity and promising results for its application in supercapacitors. Aniline was physisorbed on GO during functionalization and applying the potentials above 700 mV vs. Hg/Hg2Cl2 reference electrode, the oxidation of aniline ensued. As the result of aniline oxidation new species were formed which gave rise to the new redox peaks at lower on the voltammograms. The oxidation/reduction currents for the new redox peaks continuously increased with each subsequent cycle of aniline oxidation. The potentials of the new current peaks correspond either to the oxidation/reduction of aniline dimer, p-aminodiphenylamine, or to the product which contains phenazine rings. Since the electrode exhibited green colour characteristic of polyaniline structure, it seems obvious to conclude that macromolecular polyaniline chains with high content of phenazine rings were formed on the electrode.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:149:424291
Study programmeTitle: Materials Science and Engineering - Undergraduate study
Study programme type: university
Study level: undergraduate
Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva)
Type of resourceText
File originBorn digital
Access conditionsOpen access
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Created on2016-09-12 13:01:39