Primjena grafenskog papira kod cink-ionskih hibridnih superkondenzatora

master's thesis

• Title (english): Application of graphene paper for zinc-ion hybrid supercapacitors
• Author: Martin Cvetić
• Mentor: Marijana Kraljić Roković (mentor)
• Committee member: Marijana Kraljić Roković (predsjednik povjerenstva)
• Committee member: Jozefina Katić (član povjerenstva)
• Committee member: Zlata Hrnjak-Murgić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2020-09-30, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Superkondenzatori se ističu velikom specifičnom snagom koju mogu isporučiti što im daje prednost pred ostalim elektrokemijskim spremnicima i pretvornicima energije. Glavni nedostatak im je mala količina energije koja se može uskladištiti u usporedbi s galvanskim člancima. S druge strane, galvanski članci pak posjeduju malu specifičnu snagu. Iz tog razloga pažnju privlače hibridni superkondenzatori, odnosno asimetrični superkondenzatori gdje je jedna elektroda napravljena od materijala s kapacitivnim ponašanjem odnosno grafena, a druga od materijala kod kojeg se odvija faradejska reakcija odnosno od cinka. U ovom radu provedena je priprema grafenskog papira koji je korišten u izradi dva hibridna superkondenzatora: Zn pločica/rGO papir hibridni superkondenzator te rGO papir-Zn/rGO papir hibridni superkondenzator. rGO papir je okarakteriziran XRD metodom, FTIR spektroskopijom te je ispitana njegova električna provodnost. Pri tome je dokazano da je uspješno provedena elektrokemijska redukcija GO. Metode kojima su ispitane karakteristike hibridnih superkondenzatora su ciklička voltametrija (CV), elektrokemijska impedancijska spektroskopija (EIS) te kronopotenciometrija (CP). Kod oba superkondenzatora su dobiveni strujni vrhovi koji pokazuju da dolazi do taloženja/otapanja cinka. Zn pločica/rGO papir hibridni superkondenzator pokazao je specifični kapacitet od 44,48 F/g pri struji od 0,36 A/g, specifičnu energiju od 12,11 Wh/kg i specifičnu snagu od 1,26 kW/kg, dok je kod rGO papir- Zn/rGO papir hibridnog superkondenzatora zabilježen specifični kapacitet od 47,83 F/g pri struji od 0,83 A/g, specifična energija od 13,02 Wh/kg te specifična snaga od 10,13 kW/kg.

Abstract (english)

Supercapacitors are characterised by high power density that is an advantage of supercapacitors over the batteries. The main disadvantage of supercapacitors is the small amount of energy that can be stored. For this reason, hybrid supercapacitors attract significant attention. Hybrid supercapacitors contain one electrode made of a capacitive material such as graphene, and the other electrode made of a material in which faradaic reaction takes place such as Zn. In this work, the graphene paper was used in order to assemble two hybrid supercapacitors: Zn plate/rGO paper hybrid supercapacitor and rGO paper-Zn/rGO paper hybrid supercapacitor. rGO paper was characterized by XRD method, FTIR spectroscopy and its electrical conductivity was determined. It was proven that the electrochemical reduction of GO was successfully carried out. Methods used to examine the characteristics of hybrid supercapacitors were cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and chronopotentiometry (CP). For both supercapacitors were obtained characteristic current peaks, which indicate that zinc deposition/dissolution takes place. Zn plate/rGO paper hybrid supercapacitor showed specific capacitance of 44.48 F/g at the constant current of 0.36 A/g, specific energy of 12.11 Wh/kg and specific power of 1.26 kW/kg, while rGO paper- Zn/rGO paper hybrid supercapacitor showed specific capacitance of 47.83 F/g at the constant current of 0.83 A/g, specific energy of 13.02 Wh/kg and specific power of 10.13 kW/kg.

• Keywords: ciklička voltametrija; cink; grafen; rGO papir; superkondenzator
• Keywords (english): cyclic voltammetry; zinc; graphene; rGO paper; supercapacitor
• Language: croatian
• URN:NBN: urn:nbn:hr:149:801007
• Study programme: Title: Materials Science and Engineering - Graduate study; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka kemijskog inženjerstva (magistar/magistra inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2022-03-01 17:41:55