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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Pseudo-capacitive behavior of multi-walled carbon nanotubes decorated with nickel and manganese (hydr)oxides nanoparticles

Texto completo
Autor(es):
Nunes, Willian G. [1, 2] ; Vicentini, Rafael [1, 2] ; Freitas, Bruno G. A. [1, 2] ; Oliveira, Francisca E. R. [1, 2] ; Pascon Marque, Aline M. [1, 2] ; Maciel Filho, Rubens [1, 2] ; Doubek, Gustavo [3] ; Da Silva, Leonardo M. [4] ; Zanin, Hudson [1, 2]
Número total de Autores: 9
Afiliação do(s) autor(es):
[1] Univ Estadual Campinas, Sch Elect & Comp Engn, Carbon Sci Tech Labs, Av Albert Einstein 400, BR-13083852 Campinas, SP - Brazil
[2] Univ Estadual Campinas, Ctr Innovat New Energies, Adv Energy Storage Div, Av Albert Einstein 400, BR-13083852 Campinas, SP - Brazil
[3] Univ Campinas UNICAMP, Lab Adv Batteries, Sch Chem Engn, Adv Energy Storage Div, Ctr Innovat New Energies C, BR-13083852 Campinas, SP - Brazil
[4] Fed Univ Jequitinhonha & Mucuris Valley, Lab Fundamental & Appl Electrochem, Dept Chem, Rodovia MGT 367, Km 583, 5000, BR-39100000 Diamantina, MG - Brazil
Número total de Afiliações: 4
Tipo de documento: Artigo Científico
Fonte: JOURNAL OF ENERGY STORAGE; v. 31, OCT 2020.
Citações Web of Science: 2
Resumo

We report on the synthesis, characterization of nickel hydroxide and manganese oxide nanoparticles decorating multiwalled carbon nanotubes composite material, and electrochemical performance for energy storage pro-cesses in symmetric electrochemical capacitors. A large pseudocapacitive voltage range of 1.7 V is presented using a coin cell containing a 1.0 M Li2SO4 aqueous solution, resulting in a maximum specific capacitance of 420 F g(-1) verified at 1.67 A g(-1) during the discharge process. The symmetric coin cell was highly stable with a very high coulombic efficiency of 99% even after 70,000 cycles of charge-discharge. The high electrochemical stability of coin cell was attributed to a synergism between the nanostructured carbon support and metal (hydr) oxides nanoparticles, i.e., the transport of electrons and ions across the porous electrode structure enables with a high degree of reversibility for the solid-state redox transitions reactions, which is the main contribution to the whole electrode specific capacitance. Near-surface structural changes of the electrodes were monitored during dynamic polarization by Raman and XRD synchrotron measurements. The presence of the active Ni-O stretching mode was verified during the charge-discharge processes according to the reversible solid-state redox process. The Raman shifts were also correlated with the reversible intercalation-deintercalation processes of Li+-ions into the MnOx host material, as well as reversible adsorption of solvated ions on the surface defects of carbon nanostructures. (AU)

Processo FAPESP: 14/02163-7 - Desenvolvimento de dispositivos supercapacitores a partir de grafenos, nanotubos de carbono e diamantes
Beneficiário:Hudson Giovani Zanin
Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores
Processo FAPESP: 17/11958-1 - Divisão para armazenamento de energia avançado
Beneficiário:Rubens Maciel Filho
Linha de fomento: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia
Processo FAPESP: 16/25082-8 - Desenvolvimento de protótipo armazenador e fornecedor de energia
Beneficiário:Lenon Henrique da Costa
Linha de fomento: Bolsas no Brasil - Mestrado
Processo FAPESP: 18/20756-6 - Desenvolvimento de pseudocapacitores a partir de compósitos de óxidos metálicos e carvão ativado
Beneficiário:Willian Gonçalves Nunes
Linha de fomento: Bolsas no Brasil - Doutorado