Primjena MXene-a u vodenoj cink-ionskoj bateriji

master's thesis

• Title (english): MXene application in water-based zinc-ion battery
• Author: Bruno Palavra
• Mentor: Marijana Kraljić Roković (mentor)
• Committee member: Marijana Kraljić Roković (predsjednik povjerenstva)
• Committee member: Iva Movre Šapić (član povjerenstva)
• Committee member: Nikola Zdolšek (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2024-11-29, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

U ovom radu su pripravljeni MXene i kompozit rGO/MXene elektrode koje su okarakterizirane u dvo- i troelektrodnim sustavima te pomoću optičkog mikroskopa. Osim toga, cilj rada je bio dobiti i okarakterizirati stabilan i samostojeći materijal koji će biti pogodan kao nosač za cink u cink ionskim vodenim baterijama. Kompozitne elektrode rGO/MXene priređene su elektrokemijskom redukcijom grafenovog oksida (GO) u kompozitu GO/MXene. Utvrđeno je da stupanj redukcije GO u reducirani grafenov oksid (rGO) ovisi o tome reducira li se čisti GO ili GO u kompozitu. Kako bi se provelo ispitivanje u dvoelektrodnom sustavu priređeni su MXene i rGO/MXene papiri na koje je naknadno deponiran cink. Svojstva MXene i
rGO/MXene elektroda su ispitana metodama kronoamperometrije, cikličke voltametrije, galvanostatske polarizacije u 2 M otopini ZnSO4 te morfološkom karakterizacijom MXene i rGO/MXene slojeva pomoću optičkog mikroskopa. Cikličkom voltametrijom utvrđeno je kako sve priređene elektrode pokazuju kapacitivno ponašanje. Također je utvrđeno da elektroda koja sadrži MXene nije stabilna iznad 0,4 V. Ispitivanje različitih MXene i rGO/MXene elektroda u troelektrodnom sustavu je pokazalo kako elektroda rGO/MXene-R2 pokazuje bolja svojstva u odnosu na čisti MXene. Bolja stabilnost kompozitne rGO/MXene elektrode u odnosu na čisti MXene je potvrđena i s optičkim mikroskopom. Kompozit rGO/MXene se pokazao pogodnijim za depoziciju cinka u odnosu na MXene. Tijekom depozicije cinka u dvoelektrodnom sustavu, na MXene-a i rGO/MXene papir, kod kraćih vremena uočeni su nukleacijski maksimumi. Stoga je provedena karakterizacija nukleacije cinka na navedenim materijalima pomoću Beweick, M.Fleischman i H.R. Thirsk, i Scharifker-Hills teoretskih modela. Usporedbom rezultata kronoamperometrije i teorijskih modela za nukleacijske procese utvrđeno je da tip nukleacije najbolje odgovara trenutnoj 3D nukleaciji. Ispitivanje simetrične cinkove ćelije s MXene-Zn i rGO/MXene-Zn aktivnim materijalima pokazalo je kako priređeni aktivni materijali snižavaju prenapon otapanja i taloženja cinka.

Abstract (english)

In this work, MXene and composite rGO/MXene electrodes were prepared and characterized in two- and three-electrode systems as well as by using an optical microscope. In addition, the aim of the work was to obtain and characterize a stable and free-standing material that will be suitable as a support for zinc in zinc-ion water batteries. The rGO/MXene composite electrodes were prepared by electrochemical reduction of graphene oxide (GO) in the
GO/MXene composite. It was found that the reduction degree depends on whether pure GO or GO in the composite is reduced. In order to examine the test in a two-electrode system, MXene and rGO/MXene papers were prepared, on which zinc was subsequently deposited. The properties of MXene and rGO/MXene electrodes were tested using chronoamperometry, cyclic voltammetry, galvanostatic polarization in 2 M ZnSO4 solution. The morphological characterization of MXene and rGO/MXene layers was conducted using an optical microscope. By cyclic voltammetry, it was determined that all prepared electrodes exhibit capacitive behaviour. It was also found that the electrode containing MXene is not stable above 0,4 V. Testing of different MXene and rGO/MXene electrodes in a three-electrode system indicated that the rGO/MXene-R2 electrode has better properties compared to pure MXene. The better stability of the composite rGO/MXene electrode compared to pure MXene was also confirmed with an optical microscope. The rGO/MXene composite proved to be more suitable for zinc deposition than MXene. During zinc deposition in the two-electrode system, on MXene-a and rGO/MXene paper, nucleation maxima were observed at shorter times. Therefore, the characterization of zinc nucleation on the mentioned materials was carried out by Beweick, M.Fleischman and H.R. Thirsk, and Scharifker-Hills theoretical models. By comparing the results of chronoamperometry with theoretical models for nucleation processes, 3D instantaneous nucleation was determined. Testing of a symmetrical zinc cell with MXene-Zn and rGO/MXene-Zn active materials showed that the prepared active materials lower the zinc stripping and plating overvoltage.

• Keywords: cink-ionska baterija; kompozit; MXene; reducirani grafenov oksid (rGO); simetrična cink-ionska ćelija
• Keywords (english): zinc-ion battery; composite; MXene; reduced graphene oxide; symmetric zinc cell
• Language: croatian
• URN:NBN: urn:nbn:hr:149:071032
• 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: sveučilišni/a magistar/magistra primijenjene kemije (sveučilišni/a magistar/magistra primijenjene kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Embargoed access; Embargo expiration date: 2025-09-01
• Created on: 2024-12-02 12:25:43