Materials for electrochemical applications: optimization of the synthesis of graphene/TiO2-RuO2 and study of ionic current rectification in nanopores

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) The current energy outlook points to the need to implement methodologies that value the reduction of energy consumption, as well as the use of cleaner and more sustainable processes of production, conversion, and storage of energy. In this scenario, there is a need for a deeper understanding of phenomena and materials involved in energy-related applications. In this sense, the first part of this thesis focuses on the study of microwave-assisted hydrothermal synthesis and characterization of graphene oxide decorated with RuO2 and TiO2 nanoparticles. The selection of this material for the study is due to its potential application in the development of energy storage devices. Several parameters were studied: relative amount of metallic precursors, synthesis medium, pH, starting reactants, composition, and temperature. Among these variables, the effect of pH should be highlighted: at extremely acidic pH (pH