Izrada i karakterizacija Zn-ionske baterije temeljene na V2O5

undergraduate thesis

• Title (english): Development and characterisation of Zn-ion battery based on V2O5
• Author: Toni Štrmelj
• Mentor: Marijana Kraljić Roković (mentor)
• Committee member: Marijana Kraljić Roković (predsjednik povjerenstva)
• Committee member: Jozefina Katić (član povjerenstva)
• Committee member: Iva Movre Šapić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2023-09-19, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

U ovom radu provedena je karakterizacija reduciranog grafenova oksida (rGO) u troelektrodnom sustavu. Također, provedena je sinteza i karakterizacija rGO papira. Cilj rada bio je dobiti fleksibilan samostojeći materijal pogodan za depoziciju cinka. U tu svrhu priređen je rGO papir s ugrađenim ugljikovim nanocjevčicama (CNT) postupkom elektrokemijske redukcije pri -1,4 V. rGO/CNT papir upotrijebljen je kao anoda u cink-ionskoj bateriji uz rGO/V2O5 papir kao katodu. Karakterizacija baterije provedena je metodama kronoamperometrije (CA), cikličke voltametrije (CV) i elektrokemijske impedancijske spektroskopije (EIS). Na dobivenim cikličkim voltamogramima zabilježeni su strujni vrhovi koji odgovaraju taloženju/otapanju cinka te strujni vrhovi koji odgovaraju redoks reakciji V2O5. Vrijednosti specifičnog kapaciteta, Cs, rGO-CNT-Zn/rGO-V2O5 baterije dobivene metodom CV kreću se od 30,16 mAh g^-1 do 172,53 mAh g^-1 . Također, proveden je galvanostatski proces punjenja i pražnjenja baterije. Tom metodom dobiveni su specifični kapaciteti u rasponu od 1,83 mAh g^−1 pri najvećoj jakosti struje do 170,13 mAh g^−1 pri najmanjoj vrijednosti struje. Prije nego što je ispitana baterija, provedena je i karakterizacija elektroda (rGO, rGO/CNT, rGO/MXene i rGO/V2O5) u troelektrodnom sustavu koristeći pri tome kronoamperometriju za redukciju GO i cikličku voltametriju kako bi se deponirao cink na rGO i rGO modificiranim slojevima nanesenima na elektrodu staklastog ugljika (GC).

Abstract (english)

In this work, reduced graphene oxide (rGO) was charachterised in three-electrode system. Synthesis and characterization of rGO paper was also carried out. The aim of the work was to obtain a flexible free-standing material suitable for zinc deposition. For this purpose, rGO paper containing carbon nanotubes (CNT) was prepared by electrochemical reduction at -1.4 V. rGO/CNT paper was used as the anode in a zinc-ion battery while rGO/V2O5 paper was used as the cathode. Characterization of the battery was carried out using chronoamperometry (CA), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) methods. In the resulting cyclic voltammograms, current peaks corresponding to the deposition/dissolution of zinc and current peaks corresponding to the redox reaction of V2O5 were recorded. The values of the specific capacity, Cs, of
rGO-CNT-Zn/rGO-V2O5 batteries obtained by the CV method range from 30.16 mAh g^-1 to 172.53 mAh g^-1. Also, a galvanostatic process of charging and discharging the battery was carried out. Using this method, specific capacities ranging from 1.83 mAh g^−1 to
170.13 mAh g^−1 were recorded. Before the battery was tested, the rGO electrodes containing CNT, MXene or V2O5 (rGO, rGO/CNT, rGO/MXene and rGO/V2O5) were characterized in a three-electrode system. Reduction of GO was carried out by chronoamperomertry and Zn deposition at rGO, rGO/CNT and rGO/MXene electrodes was carried out by cyclic voltametry.

• Keywords: cink-ionska baterija; grafenov oksid; grafen; Mxene; ugljikove nanocjevčice; V2O5
• Keywords (english): zinc-ion battery; graphene oxide; graphene; MXene; carbon nanotubes; V2O5
• Language: croatian
• URN:NBN: urn:nbn:hr:149:936437
• Study programme: Title: Applied Chemistry - Undergraduate 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: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) primijenjene kemije (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) primijenjene kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access; Embargo expiration date: 2024-09-01
• Created on: 2023-11-28 14:17:25