Banca de DEFESA: LYARA FERREIRA PEREIRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : LYARA FERREIRA PEREIRA
DATE: 31/08/2023
TIME: 09:00
LOCAL: Programa de Pós-Graduação em Ciência de Materiais
TITLE:

NANOCOMPOSITES OF METAL-ORGANIC FRAMEWORKS FOR APPLICATION IN SUPERCAPACITOR ELECTRODES

KEY WORDS:

Metalorganic Frameworks, composites, Pickering emulsion, coin cells.

PAGES: 82
BIG AREA: Outra
AREA: Multidisciplinar
SUMMARY:

As the economies develop and prosper, we will face challenge to feed the demand of more than two-fold energy increase in this century. The increasing demand created fierce worldwide competition for the gradually depleting fossil fuel reserves. Meanwhile, increasing greenhouse emission results in global climate change. All these situations require our society to move towards sustainable and renewable energy resources, such as solar and wind energy. However, due to intermittent feature of solar and wind source, energy storage systems play a key role to the proper utilization of solar and wind energy. Effective chemical storage (e.g. lithium-ion battery and supercapacitors) thereby becomes imperative in the future energy technologies to provide electrical transportation power for commuters and to store energy from intermittent solar or wind power. The electrode is a critical component for controlling the performance of such devices. The fabrication of a high-performance electrode material involves some critical properties such as high conductivity, large specific surface area, temperature stability, good distribution of pores with optimized size, good corrosion resistance, and cost effectiveness. In this sense, porous materials, including Metalorganic Frameworks (MOFs), have been very promising in their application in energy storage devices; however, the problem of low electrical conductivity of such materials needs to be overcome. The association of MOFs with carbonaceous materials has been proposed as an efficient alternative to improve the electrochemical performance of such materials. Therefore, this work aims to synthesize metalorganic frameworks as well as their composites with carbon nanotubes (CNTs) and apply them in supercapacitor electrodes. The Metalorganic Frameworks were synthesized via sonochemical method, from zinc and copper salts coordinated to benzenedicarboxylate ligands. The formation of the composites was carried out by the method of Pickering emulsion, which consists of the formation of an emulsion stabilized by solid particles. The Metalorganic Framework of zinc (ZnMOF) or copper (CuMOF) was dispersed in dichloromethane, oil phase, and the functionalized carbon nanotubes dispersed in distilled water, water phase. The samples were characterized by the X-ray diffraction method, absorption spectroscopy in the infrared region with Fourier transform, scanning electron microscopy and thermal analysis. The electrochemical behavior of Metalorganic Frameworks and their composites was evaluated by the cyclic voltammetry technique using coin cell devices.

COMMITTEE MEMBERS:
Externo à Instituição - EUZEBIO SKOVROINSKI
Presidente - 2163324 - JOANNA ELZBIETA KULESZA
Externo ao Programa - 1810494 - KLEBER GONCALVES BEZERRA ALVES - null