diplomsko delo
Aneta Veršnik (Author), Miran Gaberšček (Mentor)

Abstract

Naraščajoča potreba po trajnostnih metodah proizvodnje vodikovega peroksida (H$_2$O$_2$) je spodbudila iskanje alternativnih elektrokatalizatorjev, ki bi nadomestili drage katalizatorje na osnovi plemenitih kovin. V tem diplomskem delu smo raziskali vpliv dopiranja s heteroatomi na elektrokemijsko učinkovitost komercialnega ogljika Vulcan XC72 pri reakciji redukcije kisika (ORR). Naš glavni cilj je bil optimizirati material za visoko selektivno proizvodnjo H$_2$O$_2$. Vzorci so bili dopirani z dušikom s toplotno obdelavo z amoniakom in s kisikom z ozonacijo. Analiza z vrstičnim elektronskim mikroskopom (SEM) in rentgensko fotoelektronsko spektroskopijo (XPS) je potrdila, da so se površinske lastnosti ogljika uspešno spremenile. Elektrokemijske meritve so pokazale, da so vzorci, obdelani z ozonom, izkazovali visoko selektivnost za 2-elektronsko pot, kar jih dela izjemno primerne za proizvodnjo H$_2$O$_2$. Vzorci, obdelani z amoniakom, pa so se izkazali za bolj primerne za aplikacije v superkondenzatorjih. Raziskava je potrdila, da je mogoče tudi zelo stabilen ogljikov material, kot je Vulcan XC72, uspešno modificirati in ciljno usmeriti njegove lastnosti za različne aplikacije.

Keywords

elektrokatalizatorji;reakcija redukcije kisika;proizvodnja vodikovega peroksida;heteroatomski dopanti;rotirajoča disk-obročasta elektroda;diplomska dela;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UL FKKT - Faculty of Chemistry and Chemical Technology
Publisher: [A. Veršnik]
UDC: 661.491:544.653.1(043.2)
COBISS: 247672323 Link will open in a new window
Views: 78
Downloads: 15
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Other data

Secondary language: English
Secondary title: Influence of heteroatom dopants on the electrochemical performance of Vulcan XC72 carbon for the oxygen reduction reaction
Secondary abstract: The growing need for sustainable methods of producing hydrogen peroxide (H$_2$O$_2$) has prompted the search for alternative electrocatalysts to replace expensive noble metal-based catalysts. In this thesis, we investigated the effect of heteroatom doping on the electrochemical performance of commercial Vulcan XC72 carbon in the oxygen reduction reaction (ORR). Our main goal was to optimize the material for highly selective H$_2$O$_2$ production. The samples were doped with nitrogen by heat treatment with ammonia and with oxygen by ozonation. Analysis by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) confirmed that the surface properties of the carbon had been successfully modified. Electrochemical measurements showed that the samples treated with ozone exhibited high selectivity for the 2-electron pathway, making them extremely suitable for H$_2$O$_2$ production. Samples treated with ammonia, on the other hand, proved to be more suitable for applications in supercapacitors. The research confirmed that even a very stable carbon material such as Vulcan XC72 can be successfully modified and its properties targeted for different applications.
Secondary keywords: electrocatalysts;oxygen reduction reaction;heteroatom dopants;hydrogen peroxide;Elektrokataliza;Vodikov peroksid;Univerzitetna in visokošolska dela;
Type (COBISS): Bachelor thesis/paper
Study programme: 1000372
Thesis comment: Univ. v Ljubljani, Fak. za kemijo in kemijsko tehnologijo, UNI Kemijsko inženirstvo
Pages: 1 spletni vir (1 datoteka PDF (38 str.))
ID: 27255675