High Performance Supercapacitors Based on Mesopore Structured Multiwalled Carbon Nanotubes. Issue 3 (25th February 2021)

• Record Type: Journal Article
• Authors: Xu, Yang; Shi, Weili; Li, Ruguang; Qiao, Zheng; Fang, Jian; Yang, Quanlin; Xiong, Chuanxi
• Is Part Of: ChemistryOpen. Volume 10:Issue 3(2021)
• Page Start: 347
• Page End: 351
• Publication Date: 2021-02-25
• Subjects: 3D carbon-based materials -- electrode materials -- organic oligomers -- multiwalled carbon nanotubes -- supercapacitors; Chemistry -- Periodicals; 540; 540.5
• DOI: 10.1002/open.202000274
• Languages: English
• ISSNs: 2191-1363

Abstract

Abstract: A 3D CNT/few layered graphene construct (CNT−FLG) with mesopore structure was fabricated and applied in supercapacitors. The structure was acquired through a two‐step method. Firstly, commercial multiwalled carbon nanotubes (MCNTs) were oxidized in a mixed solution of concentrated acid and modified with a couple of long‐chain organic ions. Second, the above resultant product was carbonized at a high temperature. The achieved structure offers a 3D interconnected electrically conductive network as well as mesopore structure. It also significantly improves the specific surface area of MCNTs. Result of BET tests showed that the specific surface area of CNT−FLG reached to 2235 m 2 /g. When acted as electrode materials in a supercapacitor structure, specific capacitance was approximately 531.2 F/g at a current density of 0.8 A/g. At current density of 50 A/g, specific capacitance remained 204.4 F/g. Besides, the capacitance retention was as high as 96.18 % after 10000 cycles at the current density of 5 A/g. Abstract : The surface of multiwalled carbon nanotubes has been modified by organic oligomer ion pairs, and the resultant product has been carbonized at a high temperature to achieve a novel 3D carbon nanotube‐graphene structure (CNT−FLG). This structure is provided with a large accessible surface area and 3D interconnected electrically conductive networks.