Izrada anodnog materijala za cink – ionsku bateriju

master's thesis

• Title (english): Development of anode material for zinc ion batteries
• Author: Anja Ravlić
• Mentor: Marijana Kraljić Roković (mentor)
• Committee member: Marijana Kraljić Roković (predsjednik povjerenstva)
• Committee member: Zoran Mandić (član povjerenstva)
• Committee member: Iva Movre Šapić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2021-07-14, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

U ovom radu provedena je sinteza i ispitivanje reduciranog grafenovog oksida u troelektrodnom sustavu te sinteza i ispitivanje grafenskog papira. Cilj je bio dobiti materijal koji je pogodan za depoziciju cinka. U konačnici su izrađeni hibridni superkondenzatori koji su se sastojali od papira reduciranog grafenovog oksida (rGO) i reduciranog grafenovog oksida modificiranog s 20 % CNT. Tijekom polarizacije hibridnog superkondenzatora uspješno je deponiran/otopljen cink na negativnoj elektrodi. Karakteristike elektroda (rGO, rGO/10%CNT i rGO/20%CNT) su ispitane metodom cikličke voltametrije (CV), kronoamperometrije (CA) i elektrokemijske impedancijske spektroskopije (EIS) u troelektrodnom sustavu. Metodom CV provedena je depozicija cinka na rGO, rGO/10%CNT i rGO/20%CNT slojevima. Površine elektroda prije i nakon depozicije cinka okarakterizirane su optičkim mikroskopom (OM). Dobiveni rezultati pokazali su da poroznost sloja raste dodatkom CNT. rGO i rGO/20%CNT uzorci su izabrani za pripravu grafenskog papira i izradu hibridnog superkondenzatora. Ispitana je električna provodnost rGO papira i rGO/20%CNT papira koja je iznosila
5,08 Scm^-1, odnosno 5,79 Scm^-1. Karakteristike pripravljenih hibridnih superkondenzatora ispitane su metodom CV i EIS. Zabilježeni su strujni vrhovi koji odgovaraju taloženju/otapanju cinka. Specifične vrijednosti kapaciteta rGO papir/rGO papir hibridnog superkondenzatora kretale su se od 6,04 do 14,46 Fg^-1, a (rGO/20%CNT) papir/(rGO/20%CNT) papir hibridnog superkondenzatora od 28,25 do 39,07 Fg^-1.

Abstract (english)

In this work, the synthesis and testing of reduced graphene oxide in a three-electrode system as well as the synthesis and testing of graphene paper were performed. The goal was to obtain a material suitable for zinc deposition. Finally, hybrid supercapacitors containing reduced graphene oxide (rGO) paper and reduced graphene oxide modified with 20% CNT were assembled. During the polarization of the hybrid supercapacitor, zinc was successfully deposited/dissolved on the negative electrode. Electrode (rGO, rGO/10%CNT and rGO/20%CNT) characteristics were examined in three electrode system by cyclic voltammetry (CV), chronoamperometry (CA) and electrochemical impedance spectroscopy (EIS). Zinc deposition on rGO, rGO/10%CNT and rGO/20% CNT layers was performed by the CV method. Electrode surfaces before and after zinc deposition were characterized by an optical microscope (OM). The obtained results showed that the porosity of the layer increases with the addition of CNT. rGO and rGO/20%CNT samples were selected for graphene paper synthesis. The electrical conductivity of rGO paper and rGO/20% CNT paper was found to be 5.08 Scm^-1 and 5.79 Scm^-1, respectively. The characteristics of the prepared hybrid supercapacitors were examined by CV and EIS. Current peaks corresponding to zinc deposition/dissolution have been obtained. The specific capacitance values of the rGO paper/rGO paper hybrid supercapacitor ranged from 6.04 to 14.46 Fg^-1, and the values of the (rGO/20%CNT) paper/(rGO/20%CNT) paper hybrid supercapacitor ranged from 28.25 to 39.07 Fg^-1.

• Keywords: ciklička voltametrija; cink; CNT; grafen; hibridni superkondenzator; rGO papir
• Keywords (english): cyclic voltammetry; zinc; CNT; graphene; hybrid supercapacitor; rGO paper
• Language: croatian
• URN:NBN: urn:nbn:hr:149:458383
• Study programme: Title: 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 resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-04-07 08:28:34