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Title: High rate capacitive performance of single-walled carbon nanotube aerogels

Single-walled carbon nanotube (SWCNT) aerogels produced by critical-point-drying of wet-gel precursors exhibit unique properties, such as high surface-area-to-volume and strength-to-weight ratios. They are free-standing, are binder-free, and can be scaled to thicknesses of more than 1 mm. In this paper, we examine the electric double layer capacitive behavior of these materials using a common room temperature ionic liquid electrolyte, 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMI-TFSI). Electrochemical performance is assessed through galvanostatic cycling, cyclic voltammetry and impedance spectroscopy. Results indicate stable capacitive performance over 10,000 cycles as well as an impressive performance at high charge and discharge rates, due to accessible pore networks and enhanced electronic and ionic conductivities of SWCNT aerogels. Finally, these materials can find applications in mechanically compressible and flexible supercapacitor devices with high power requirements.
Authors:
 [1] ;  [2] ;  [3] ;  [1] ;  [3] ;  [3] ;  [1]
  1. Drexel Univ., Philadelphia, PA (United States). A. J. Drexel Nanomaterials Inst.. Dept. of Materials Science and Engineering
  2. Drexel Univ., Philadelphia, PA (United States). A. J. Drexel Nanomaterials Inst.. Dept. of Materials Science and Engineering; Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Materials Science and Engineering
  3. Carnegie Mellon Univ., Pittsburgh, PA (United States). Dept. of Materials Science and Engineering
Publication Date:
OSTI Identifier:
1265520
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Nano Energy
Additional Journal Information:
Journal Volume: 15; Journal ID: ISSN 2211-2855
Publisher:
Elsevier
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Contributing Orgs:
Drexel Univ., Philadelphia, PA (United States); Carnegie Mellon Univ., Pittsburgh, PA (United States)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 77 NANOSCIENCE AND NANOTECHNOLOGY SWCNT aerogel; Supercapacitor; Ionic liquid; Electrochemistry