Browsing by Author "Tkesheliadze, Tinatin"

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    Oxygen Reduction Catalysts Based on Iron and Cobalt Phthalocyanine Modified Shungite
    (2020) Tkesheliadze, Tinatin; Mooste, Marek; Tammeveski, Kaido
    Electrocatalytic oxygen reduction reaction (ORR) activity was studied on natural shungite-based materials prepared by functionalisation with Fe- and Co-phthalocyanine (Pc) com-plexes via pyrolysis. Structural and elemental composition of the pristine and modified cat-alysts were studied using several physical characterisation methods. The ORR activity of the materials was assessed by the rotating disc electrode method in alkaline and acidic media, resulting in superior ORR performance of KOH-treated FePc modified shungite material in 0.1 M KOH solution. Stability testing performed on most active catalysts in alkaline media showed a high stability of the prepared shungite-based electrocatalysts. The testing in 0.5 M H2SO4 solution also revealed the superior ORR activity of KOH-treated FePc modified shungite material. In estonian: Käesolevas töös uuriti hapniku redutseerumist katalüsaatormaterjalidel, mis põhinesid püro-lüüsi teel valmistatud Fe- ja Co-ftalotsüaniiniga (Pc) modifitseeritud šungiidil. Valmistatud materjalide omadusi uuriti mitmete füüsikaliste karakteriseerimismeetoditega. Hapniku elektrokeemilist redutseerumist valmistatud materjalidel uuriti nii aluselises kui ka happeli-ses lahuses. Kõige aktiivsem hapniku redutseerumise katalüsaator aluselise keskkonna jaoks valmistati KOH lahuses töödeldud šungiidist, mis oli modifitseeritud FePc ühendiga. Sta-biilsustestid 0,1 M KOH lahuses näitasid valmistatud katalüsaatormaterjalide head stabiil-sust. Happelises keskkonnas tehtud eksperimendid näitasid samuti kõige paremat aktiivsust hapniku redutseerumiseks KOH lahuses töödeldud ja FePc ühendiga valmistatud materjalil.