Elektrokatalitička svojstva elektroda modificiranih s dvoslojem niklova heksacijanoferata i željezova heksacijanoferata i njihova primjena u elektrokemijskoj detekciji vodikova peroksida

master's thesis

• Title (english): Electrocatalytic properties of electrodes modified with nickel hexacyanoferrate/iron hexacyanoferrate bilayers and their application in electrochemical detection of hydrogen peroxide
• Author: Hana Vlašić Trbić
• Mentor: Damir Iveković (mentor)
• Granter: University of Zagreb; Faculty of Food Technology and Biotechnology; (Department of Chemistry and Biochemistry); (Laboratory for General and Inorganic Chemistry and Electroanalysis); Zagreb
• Defense date and country: 2012-02-22, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Biotechnology

Abstract

Berlinsko se modrilo dosad pokazao kao najbolji anorganski katalizator za elektrokemijsku redukciju vodikovog peroksida, analita koji nastaje kao produkt oksidacije velikog broja različitih analita u biosenzorima temeljinih na enzimima oksidazama. Velika mana berlinskog modrila kao elektrokatalizatora leži u njegovoj relativno lošoj stabilnosti u neutralnom i lužnatom području, u kojima dolazi do njegove hidrolitičke degradacije, što za posljedicu ima konstantno narušavanje analitičkih svojstava senzora. Ugradnjom male količine stranih kationa u kristalnu rešetku berlinskog modrila značajno se mijenjaju njegova svojstva. Stoga je cilj ovoga rada bio ispitati stabilnost i elektrokatalitička svojstva tankih filmova berlinskog modrila modificiranih ionima Ni2+. Pokazano je da djelomična supstitucija iona željeza koordiniranih s dušikom u kristalnoj rešetki berlinskog modrila s ionima Ni2+ značajno povećava stabilnost tankih filmova berlinskog modrila u blago lužnatom mediju (do pH = 10,0), bez značajnijeg smanjenja elektrokatalitičkih svojstava filma.

Abstract (english)

Prussian blue is so far proved as the best inorganic catalysts for electrochemical reduction of hydrogen peroxide, which is oxidation product of a large number of different analytes in oxidase-based biosensors. A major flaw of the Prussian blue as electrocatalyst is relatively poor stability in neutral and alkaline media, which leads to its hydrolytic degradation and results in loss of the analytical performances of the sensor. Incorporation of small amounts of foreign cations into the crystal lattice of the Prussian blue significantly alters its properties, which is why we in this thesis examined the stability and electrocatalytic properties of thin Prussian blue films modified with Ni2+ ions. We found that partial substitution of nitrogen-coordinated iron ions in Prussian blue crystal lattice with Ni2+ ions significantly enhance the stability of Prussian blue thin films in mild alkaline media (up to pH 10,0), without significantly affecting the electrocatalytic performances of the films.

• Keywords: ciklička voltametrija; berlinsko modrilo; pH stabilnost; vodikov peroksid; senzor
• Keywords (english): Cyclic voltammetry; Prussian blue; pH stability; hydrogen peroxide; sensor
• Language: croatian
• URN:NBN: urn:nbn:hr:159:749556
• Study programme: Title: Biotechnology; specializations in: Biochemical-Microbiology; Course: Biochemical-Microbiology; Study programme type: university; Study level: graduate; Academic / professional title: diplomirani inženjer biotehnologije; smjer biokemijsko-mikrobiološki (diplomirani inženjer biotehnologije; smjer biokemijsko-mikrobiološki)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2017-05-18 08:58:24