Title Nanostruktūrinių grafeno katalizatorių, katalizatorių nešiklių ir dangų sintezė bei tyrimas /
Translation of Title Nano-structured graphene catalysts, catalyst supports and coatings: synthesis and investigation.
Authors Gaidukevič, Justina
Full Text Download
Pages 44
Keywords [eng] graphene oxide ; catalysts ; thermal reduction ; catalyst supports ; GO coatings
Abstract [eng] The dissertation deals with the research, which is carried out on the properties of catalytic materials. The catalytic materials are studies intensively worldwide. Our reseach is intended to discover innovative and efficient catalytic materials that can be applied as catalysts in the industrial production of biodiesel, as well as in an electrochemical oxygen reduction reaction. Simultaneously, we have prepared the enzyme carriers for biosensors. In this work, catalysts for the production of biodiesel were prepared by treating thermally reduced graphene oxide with concentrated H2SO4, 4-aminobenzenesulphonic or concentrated H3PO4 acids, and by treating with gaseous NH3 or melamine. It was demonstrated that the sample functionalized with 4-aminobenzenesulphonic acid is a promising alternative to the commercial Amberlyst -15 catalyst. Moreover, a new (SCN)n/graphene nanocomposite material was prepared during mechanochemical reaction and tested as electrocatalyst for oxygen reduction reaction. The electrochemical measurements showed that our product was 5 times more efficient compared to the commercial Pt catalyst. The innovative design of thermal reduction and fractionation system of graphite oxide was also developed in this research. It was found that prepared TRGO fractions were suitable for the development of reagentless amperometric D-fructose biosensors. The last part of experimental work was to optimize the transferring process of graphene oxide coatings onto the transparent polyethylene terephthalate substrate. The two-stage optimization procedure was chosen for this study: a Plackett–Burman experimental design and a simplex algorithm. A set of parameters at optimal conditions was found for the transferring procedure.
Dissertation Institution Vilniaus universitetas.
Type Summaries of doctoral thesis
Language Lithuanian
Publication date 2017