Surface and Electrochemical Properties of Radially Oriented Multiwalled Carbon Nanotubes Grown on Stainless Steel Mesh

Autor(es)

Nunes, Willian G. ^[1] ; Vicentini, Rafael ^[1] ; Da Silva, Leonardo M. ^[2] ; Costa, Lenon H. ^[1] ; Tadeu, Thais ^[1] ; Zanin, Hudson ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Adv Energy Storage Div, Ctr Innovat New Energies, Carbon Sci Tech Labs, Sch Elect & Comp Engn, BR-13083852 Campinas, SP - Brazil

^[2] Fed Univ Jequitinhonha & Mucuris Valley, Dept Chem, BR-39100000 Diamantina, MG - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Electrochemical Society; v. 165, n. 16, p. A3684-A3696, DEC 1 2018.
• Citações Web of Science: 2

Resumo

We report on the direct growth of radially oriented multiwalled carbon nanotubes (ROMWCNTs) on stainless steel (AISI 304L) fine-mesh substrate using the chemical vapor deposition (CVD) method to get a stable scaffold for supercapacitors using redoxactive materials (e.g., metallic oxides and conducting polymers). The scaffold was characterized by different `ex situ' (e.g., scanning and transmission electron microscopy, Raman, X-ray photoelectron and energy dispersive spectroscopy, surface area, and porosity analyses) and `in situ' (e.g., cyclic voltammetry, chronopotentiometry, and electrochemical impedance spectroscopy) techniques. We explore this data to identify the origin of capacitance observed. Morphology factor (phi) parameter revealed that only 16% of the energy stored in the electrical double-layer is confined in the inner surface regions of the scaffold. It was verified a substantial contribution of the reversible solid-state surface faradaic reactions (RSFRs) to the overall specific capacitance observed. The coin cell was characterized by low equivalent series resistance, fast RSFRs, and very high stability during the galvanostatic charge-discharge experiments. All these results encourage further developments using the ROMWCNTs: AISI fine-mesh composite as a promising scaffold for applications in supercapacitors devices using redox-active materials. (C) 2018 The Electrochemical Society. (AU)

• Processo FAPESP: 17/19222-4 - Desenvolvimento de dispositivo armazenador e fornecedor de energia elétrica e metodologia de análise dinâmica em modo de operação
• Beneficiário: Lenon Henrique da Costa
• Linha de fomento: Bolsas no Brasil - Doutorado Direto
• 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: 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