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

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]}

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

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