期刊
ELECTROCHEMISTRY COMMUNICATIONS
卷 19, 期 -, 页码 138-141出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2012.03.021
关键词
Carbon nanotubes; Supercapacitors; Porosity; Specific capacitance; Electrochemical double layer capacitor; Ultracapacitor
资金
- National Science Foundation [ECCS-0801942, DMR-1106173]
- National Institutes of Health [1R21NS070033-01A1]
- RTI International through the RTI Fellows Program
Electrochemical charge storage characteristics of vertically aligned multi-walled carbon nanotubes (MWCNTs) as a function of varying diameter and spacing are reported. It was observed that the specific capacitance of the MWCNTs increased as both diameter and inter-tube spacing decreased. The MWCNT films with 230 nm inter-MWCNT spacing exhibited specific capacitance of 228 F/g versus 70 F/g for 506 nm spacing, when tested in a non-aqueous electrolyte. Further, a trend in specific capacitance versus pore size is proposed. Coupled with previously reported trends observed in the sub-10 nm pore size regime, this is expected to offer better understanding of electrochemical behavior of porous carbon materials over a wide range of pore sizes. (C) 2012 Elsevier B.V. All rights reserved.
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