Visokoentropijski oksidi za primjenu u fotokatalizi, organskoj pretvorbi i heterogenoj katalizi

doctoral thesis

• Title (english): High entropy oxides for use in photocatalysis, organic conversion and heterogeneous catalysis
• Author: Dalibor Tatar
• Mentor: Igor Đerđ (mentor)
• Committee member: Vladimir Stilinović (predsjednik povjerenstva)
• Committee member: Jasminka Popović (član povjerenstva)
• Committee member: Marijana Jurić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Chemistry); Zagreb
• Defense date and country: 2024-07-11, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry
• Universal decimal classification (UDC): 54 - Chemistry. Crystallography. Mineralogy

Abstract

Doktorska disertacija prikazuje rezultate istraživanja multifunkcionalnosti nanokristalnih visokoentropijskih oksida rijetkih zemalja sintetiziranih modificiranom sol-gel metodom (ukupno 13 spojeva). Napredna strukturna, termička i spektroskopska analiza sintetiziranih spojeva rezultirala je spoznajom o kristalnoj strukturi, mikrostrukturi, termičkoj stabilnosti te otkrićem prirode i koncentracije kristalnih defekata, bitnih značajki važnih za interpretaciju ispitivanih svojstava te elaboriranje istih s ciljem moguće primjene. Ispitivanja svojstava visokoentropijskih oksida (CO2 hidrogenacija, cijepanje vode, razgradnja organskih bojila i kataliza organske sinteze) pokazuje poboljšana fizikalno-kemijska svojstva u odnosu na referentni jednostavni oksid fluoritne strukture CeO2. Rezultati ovih istraživanja otkrivaju multifunkcionalnost ovih materijala, što ih čini obećavajućim za različite primjene u fotokatalizi i heterogenoj katalizi. Dodatno je primjenom DFT teorijskog modeliranja nađena poveznica između popularnih istraživačkih termina struktura-svojstva što objašnjava razloge poboljšanih ispitivanih svojstava ovih materijala.

Abstract (english)

The doctoral dissertation presents the results of multi-year research of the multifunctionality of nanocrystalline high-entropy rare-earth oxides synthesized by the modified sol-gel method (a total of 13 compounds). Advanced structural, thermal and spectroscopic analysis of the synthesized compounds resulted in the knowledge of their crystal structures, microstructures, thermal stability and the discovery of the nature and concentration of crystal defects, essential features important for the interpretation of the studied properties and their elaboration with the aim of possible application. The study of the properties of high-entropy oxides show improved physicochemical properties compared to the reference simple oxide of the fluorite structure CeO2. The results of these studies reveal the multifunctionality of these materials, which makes them promising for various applications in photocatalysis and heterogeneous catalysis. Additionally, by applying DFT theoretical modeling, a link between the popular structure- property research terms was found, which explains the reasons for the improved investigated properties of these materials.

• Keywords: cerijev dioksid; elektrokatalitička proizvodnja vodika; fotokataliza; heterogena kataliza; hidrogenacija CO2; organska konverzija; visokoentropijski oksidi
• Keywords (english): ceria; electrocatalytical hydrogen generation; photocatalysis; heterogeneous catalysis; CO2 hydrogenation; organic conversion; high entropy oxides
• Language: croatian
• URN:NBN: urn:nbn:hr:217:684582
• Promotion: 2024
• Project: Number: PZS-2019-02-2467; Title: Istraživanje utjecaja metalnih promotora rijetkih zemalja i stupnja uređenja na redoks svojstva sustava CeO2 - ZrO2; Title: The study of the role of rare earth metal promoters and ordering on the redox properties of CeO2 - ZrO2 system; Acronym: SREMPOREPROCEZIS; Leader: Igor Đerđ; Jurisdiction: Croatia; Funder: Hrvatska zaklada za znanost; Funding stream: Programme Research Cooperability
• Study programme: Title: Doctoral study; Study programme type: university; Study level: postgraduate; Academic / professional title: doktor/doktorica u području prirodnih znanosti (doktor/doktorica u području prirodnih znanosti)
• Type of resource: Text
• Extent: 147 str. ; 30 cm
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-09-06 09:47:18