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

Author(s)

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

Affiliation

^[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

• Document type: Journal article
• Source: Journal of the Electrochemical Society; v. 165, n. 16, p. A3684-A3696, DEC 1 2018.
• Web of Science Citations: 2

Abstract

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)

• FAPESP's process: 16/25082-8 - Development of prototype of energy storer and supplier
• Grantee: Lenon Henrique da Costa
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 14/02163-7 - Development of supercapacitors devices from graphene, carbon nanotubes and diamonds
• Grantee: Hudson Giovani Zanin
• Support Opportunities: Research Grants - Young Investigators Grants
• FAPESP's process: 17/19222-4 - Development of storage and supplier device of electric power and methodology of dynamic analysis in operation mode
• Grantee: Lenon Henrique da Costa
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)