magistrsko delo
Miha Hotko (Author), Miran Gaberšček (Mentor), Matija Strlič (Thesis defence commission member), Boštjan Genorio (Thesis defence commission member)

Abstract

Največji problem elektrokatalizatorjev platinske skupine je, da gre za izjemno drage elemente, katerih letna proizvodnja je majhna, saj je njihova vsebnost v zemeljski skorji zelo nizka in lokalna. Zato je eden od ciljev razvoja novih elektrokatalizatorjev ta, da bi se omenjene kovine uporabljale v čim manjši količini oziroma da bi se našla ustrezna zamenjava s kovinami, ki so cenejše in bolj dostopne. Ena od takšnih kovin, ki hkrati kaže relativno dobro elektrokatalitsko aktivnost za reakcijo razvoja kisika, je nikelj. V magistrskem delu je izmerjenih in analiziranih več različnih katalizatorjev na osnovi niklja, ki so bili sintetizirani na Kemijskem inštitutu. Za študij njihove aktivnosti smo uporabili celico s plinsko difuzivno elektrodo (GDE), saj daje v primerjavi z rotirajočo diskasto elektrodo (RDE) bolj realne rezultate. RDE smo uporabili za študijo aktivacije katalizatorjev, pri čemer smo ugotovili, da predhodna aktivacija, ki povzroči tvorbo βNi(OH)2, poveča aktivnost katalizatorja. Nekaterim vzorcem je aktivnost zvišala še dodatna aktivacija, pri čemer se je tvoril NiOOH. Vzorci so bili analizirani še z vrstično elektronsko mikroskopijo in energijsko disperzivno rentgensko spektroskopijo. Izvedli smo tudi Taflovo analizo in izračunali prenapetost η10; napetost, ko gostota toka doseže 10 mA/cm2.

Keywords

vodni elektrolizerji;elektrokatalizatorji;nikelj;reakcija razvoja kisika;plinsko difuzijska celica;magistrska dela;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UL FKKT - Faculty of Chemistry and Chemical Technology
Publisher: [M. Hotko]
UDC: 544.642(043.2)
COBISS: 163849475 Link will open in a new window
Views: 12
Downloads: 2
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Other data

Secondary language: English
Secondary title: Activity of Ni catalysts in the oxygen evolution reaction (OER)
Secondary abstract: The biggest problem with platinum group electrocatalysts is that they are extremely expensive and their annual production is small, as their content in the Earth's crust is very low and localized. For these reasons, the goal is to use these metals as little as possible or to completely replace them with metals that are cheaper and more accessible. One of such metals that simultaneously exhibits relatively good electrocatalytic activity for the oxygen evolution reaction is nickel.. In this master's work, several different catalysts, which were synthesized at the National Insitute of Chemistry, are measured and analyzed. A gas diffusion electrode (GDE) was used to study their activity, as it gives more realistic results compared to a rotating disk electrode (RDE). RDE was used to study the activation of catalysts, where it was found that the prior activation of β-Ni(OH)2 increases the activity of the catalyst. For some samples the activity was increased by additional activation where NiOOH is formed. Samples were also analyzed by scanning electron microscopy and energy dispersive X-ray spectroscopy. A Tafel analysis was performed on the results and the overvoltage η10; voltage when current density reaches 10 mA/cm2.
Secondary keywords: nickel;oxygen evolution reaction;gas diffusion cell;electrocatalyst;Elektrokataliza;Univerzitetna in visokošolska dela;
Type (COBISS): Master's thesis/paper
Study programme: 1000375
Thesis comment: Univ. v Ljubljani, Fak. za kemijo in kemijsko tehnologijo, smer Kemija
Pages: 42 str.
ID: 19908954