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Sinteza z dušikom dopiranega grafena za uporabo v napravah za shranjevanje in pretvorbo energije
Oštir, Domen (Author), Genorio, Boštjan (Mentor) More about this mentor... This link opens in a new window

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Abstract
Živimo v obdobju, ko daje družba vedno večji pomen trajnostnemu razvoju in trenutno je veliko raziskav usmerjenih na razvoj gorivnih celic. Glavna pomanjkljivost takih celic je predvsem stabilnost in aktivnost katalizatorjev za reakcijo redukcije kisika. Grafen in njegove modifikacije so v zadnjem času zelo preiskovani materiali, saj imajo lastnosti, ki so zanimive za uporabo na številnih področjih. Z dušikom dopiran grafen ima velik potencial za uporabo v gorivnih celicah predvsem zaradi dobrih elektrokatalitskih lastnosti. Ciljan material sem pripravil iz naravnega in umetnega grafita ter C-grade in X-long večstenskih ogljikovih nanocevk. Izhodiščni material sem najprej oksidiral z modificirano Hummerjevo metodo, kar se je na koncu izkazalo za ključen korak, saj stopnja oksidacije vpliva na možnost dopiranja materiala. Oksidaciji je sledilo dopiranje s tremi različnimi postopki. Tako pridobljen z dušikom dopiran grafen sem okarakteriziral z vrstičnim elektronskim mikroskopom z energijskim spektrometrnom (SEM-EDS), elementno analizo (CHN), Ramansko spektroskopijo, termogravimetričnimi meritvami sklopljenimi z masno spektroskopijo (TGA-MS), rentgensko fotoelektronsko spektroskopijo (XPS) in analizo specifične površine BET. Glede na rezultate raziskav, sem ugotovil, da ima za nadaljnje študije največji potencial (kot katalizator ORR in kot membrana v DEFC), z dušikom dopiran grafen iz naravnega in umetnega grafita, pripravljen s postopkom pirolize v amonijevi atmosferi.

Language:Slovenian
Keywords:grafen, ogljikove nanocevke, oksidacija, dopiranje z dušikom, karakterizacija
Work type:Master's thesis/paper (mb22)
Tipology:2.09 - Master's Thesis
Organization:FKKT - Faculty of Chemistry and Chemical Technology
Year:2020
COBISS.SI-ID:1538568387 This link opens in a new window
Views:460
Downloads:201
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Secondary language

Language:English
Title:Synthesis of nitrogen doped graphene for energy storage and conversion applications
Abstract:
We are living in era, when society is giving more and more attention to sustainable development and there is currently a lot of research focused on the development of fuel cells. The major disadvantage of these is the stability and activity of ORR catalysts. Graphene and its modifications have recently been highly researched materials due to the remarkable properties that can be used in various fields. Nitrogen doped graphene has a great potential for use in fuel cells mostly because of its electrocatalytic properties. I prepared the material from natural graphite, synthetic graphite, C-grade MWCNTs and X-long MWCNTs. First step was oxidation of those starting materials with Hummer's method, which has proven to be a crucial step, since the degree of oxidation affects the possibility of doping the material with nitrogen. Oxidation was followed by doping with three different processes. Prepared material was then characterized with scanning electron microscope (SEM), elemental analysis (CHN), Raman spectroscopy, thermogravimetric measurements coupled with mass spectroscopy, X-ray photoelectronic spectroscopy (XPS), energy dispersive X-ray spectroscopy (EDS) and BET analysis. The most promising way of preparing nitrogen doped graphene as catalyst for ORR and as membrane in DEFC based on findings in this research is material prepared from graphite with thermal annealing in ammonia.

Keywords:graphene, carbon nanotubes, oxidation, nitrogen doping, characterization

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