Document Detail


Cutting and unzipping multi-walled carbon nanotubes into curved graphene nanoribbons and their enhanced supercapacitor performance.
MedLine Citation:
PMID:  23148646     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
We report a remarkable transformation of multi-walled carbon nanotubes (MWCNTs) to curved graphene nanosheets (CGN) by a Hummers method. Through this simple process, MWCNTs can be cut and unzipped in the transverse and longitudinal direction, respectively. The as-obtained CGN possess the unique hybrid structure of 1D nanotube and 2D graphene. Such particular structure together with the improved effective surface area affords high specific capacitance and good cycling stability during the charge-discharge process when used as supercapacitor electrodes. The electrochemical measurements show that CGN exhibit higher capacitive properties than pristine MWCNTs in three different types of aqueous electrolytes, 1 M KOH, 1 M H2SO4, and 1 M Na2SO4. A specific capacitance of as high as 256 F g-1 at a current density of 0.3 A g-1 is achieved over the CGN material. The improved capacitance may be attributed to high accessibility to electrolyte ions, extended defect density and increased effective surface area. Meanwhile, this high-yield production of graphene from low cost MWCNTs is important for the scalable synthesis and industrial application of graphene. Furthermore, this novel CGN nanostructure could also be promisingly applied in many fields such as nanoelectronics, sensors, nanocomposites, batteries and gas storage.
Authors:
Huan-Wen Wang; Yalan Wang; Zhong-Ai Hu; Xuefeng Wang
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-13
Journal Detail:
Title:  ACS applied materials & interfaces     Volume:  -     ISSN:  1944-8252     ISO Abbreviation:  ACS Appl Mater Interfaces     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101504991     Medline TA:  ACS Appl Mater Interfaces     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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