The doctoral thesis focuses on the development and comprehensive characterization of functionalized graphene based non noble metal containing electrocatalysts for ethanol oxidation reaction (EOR) as well as for oxygen reduction reaction (ORR) in alkaline direct ethanol fuel cells.
The catalysts are synthesized and characterized by cyclic voltammetry and chronoamperometry using a rotating (ring) disk electrode. The structure, morphology, elemental composition of the catalysts are characterized by different physicochemical methods. The synthesized and advanced functionalized graphene based electrode materials are used for the development of membrane electrode assemblies (MEAs). The influence of production parameters and cell design on performance of MEAs are investigated on cell level with various characterization methods including cyclic voltammetry, electrical impedance spectroscopy, and current-voltage characterization.
The aim of the thesis is to apply the obtained knowledge to enhance the power density, the lifetime of the MEA, the catalytic activities and long-term stabilities of mono/bi- or polymetallic catalysts for EOR and ORR in alkaline media including graphene and functionalized graphene as carbon support material.