Detalhes bibliográficos
| Ano de defesa: |
2023 |
| Autor(a) principal: |
FERREIRA , Raissa Soares Penha
 |
| Orientador(a): |
GARCIA, Marco Aurélio Suller
|
| Banca de defesa: |
GARCIA, Marco Aurélio Suller
,
DOURADO, André Henrique Baraldi
,
LIMA, Roberto Batista de
|
| Tipo de documento: |
Dissertação
|
| Tipo de acesso: |
Acesso aberto |
| Idioma: |
por |
| Instituição de defesa: |
Universidade Federal do Maranhão
|
| Programa de Pós-Graduação: |
PROGRAMA DE PÓS-GRADUAÇÃO EM QUÍMICA/CCET
|
| Departamento: |
DEPARTAMENTO DE QUÍMICA/CCET
|
| País: |
Brasil
|
| Palavras-chave em Português: |
|
| Palavras-chave em Inglês: |
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| Área do conhecimento CNPq: |
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| Link de acesso: |
https://tedebc.ufma.br/jspui/handle/tede/5000
|
Resumo: |
This work aims to develop a simple and effective methodology for synthesizing 1D nanomaterials (nanowires) of manganese oxides that will serve as a template for forming nanohybrids with sulfur. The central idea is to produce cheap and stable materials for applications in pseudo-supercapacitors. As these devices aim to store a large number of electrical charges, accumulating an internal imbalance of charges, materials with controlled size, shape, and composition can be used to modulate the efficiency of the devices. The results obtained so far show, through microscopy, that the nanowires were successfully obtained and that although structural modifications occurred after sulfur insertion, the longitudinal aspect, important for charge-discharge applications, was maintained. In addition, some indications show that the materials incorporated sulfur in their structure. The best electrode was the 70% MnO2-S due to the high electrochemical activity and capacitance values, which were 807.5, 655, 560, 495, 440, and 425 F g-1 at current densities of 1, 2, 4, 6, 8, and 10 A g-1 . Still, the electrode retained 52.63% of the initial capacitance, which is a promising result for the area |
