Upotreba grafenskog papira u elektrokemijskim izvorima energije

undergraduate thesis

• Title (english): Application of graphene paper in electrochemical energy power sources
• Author: Danijela Jurić Kaćunić
• Mentor: Marijana Kraljić Roković (mentor)
• Committee member: Marijana Kraljić Roković (predsjednik povjerenstva)
• Committee member: Jozefina Katić (član povjerenstva)
• Committee member: Igor Sutlović (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2020-09-21, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Cilj ovog rada bio je prirediti papir od reduciranog grafenovog oksida (rGO) elektrokemijskim postupkom. Kao prekursor u sintezi rGO korišten je grafenov oksid (GO) koji je dobiven u laboratoriju Hummersovom metodom. U prvom koraku je iz otopine GO priređen GO papir koji je potom elektrokemijskom redukcijom preveden u rGO papir. Dobiveni rGO papir je korišten kao aktivni materijal u superkondenzatoru. Ispitivanje superkondenzatora provedeno je u dvoelektrodnom sustavu u kojem je korišten strujni kolektor od nikla, staklena vlakna kao separator te rGO kao aktivni materijal. Superkondenzatori su ispitani metodama cikličke voltametrije (CV), kronopotenciometrije (CP) i metodom elektrokemijske impedancijske strukture (EIS). Ispitivanje metodom CV provedeno je u raznim granicama napona i uz različite brzine promjene potencijala. Metodom kronopotenciometrije je provedeno ispitivanje punjenja/ pražnjenja superkondenzatora tijekom 1000 ciklusa uz dvije različite specifične struje, 0,69 A g^-1 i 1,17 A g^-1. Superkondenzator 2 je pokazao bolja svojstva što je posljedica bolje izvedbe superkondenzatora. Pri tome je zabilježen specifični kapacitet od 31,00 F g^-1, specifična energija od 6,20 Wh kg^-1 i specifična snaga od 2,26 kW kg^-1.

Abstract (english)

The aim of this work was to prepare reduced graphene oxide (rGO) paper by electrochemical process. Graphene oxide (GO) obtained in the laboratory by the Hummers method was used as a precursor in the synthesis of rGO. In the first step, GO paper was prepared by using GO solution and in the second step it was reduced in order to obtain rGO paper. The resulting rGO paper was used as the active material in the supercapacitor. The supercapacitor characterisation was performed in a two-electrode system by using a nickel current collector, glass fibres as a separator and rGO as the active material. The supercapacitors were tested by using cyclic voltammetry (CV), chronopotentiometry (CP) and electrochemical impedance structure (EIS) methods. The CV test was performed at different voltage limits and at different scan rates. The chronopotentiometry method was used in order to obtain charging -discharging properties of supercapacitors, during 1000 cycles, by applying two different specific currents, 0.69 A g^-1 and 1.17 A g^-1. Supercapacitor 2 showed better properties as a result of better performance of the supercapacitor. A specific capacitance of 31.00 F g^-1, a specific energy of 6.20 Wh kg^-1 and a specific power of
2.26 kW kg^-1 were recorded.

• Keywords: grafenov oksid; grafen; elektrokemijska redukcija; superkondenzator
• Keywords (english): graphene oxide; graphene; electrochemical reduction; supercapacitor
• Language: croatian
• URN:NBN: urn:nbn:hr:149:465917
• Study programme: Title: Chemical 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 resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-05-04 10:04:05