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Title: Capacitance, charge dynamics, and electrolyte-surface interactions in functionalized carbide-derived carbon electrodes

Our study analyzed the dynamics of ionic liquid electrolyte inside of defunctionalized, hydrogenated, and aminated pores of carbide-derived carbon supercapacitor electrodes. The approach tailors surface functionalities and tunes nanoporous structures to decouple the influence of pore wall composition on capacitance, ionic resistance, and long-term cyclability. Moreover, quasi-elastic neutron scattering probes the self-diffusion properties and electrode-ion interactions of electrolyte molecules confined in functionalized pores. Room-temperature ionic liquid interactions in confined pores are strongest when the hydrogen-containing groups are present on the surface. This property translates into higher capacitance and greater ion transport through pores during electrochemical cycling. Aminated pores, unlike hydrogenated pores, do not favorably interact with ionic liquid ions and, subsequently, are outperformed by defunctionalized surfaces.
Authors:
 [1] ;  [2] ;  [1] ;  [1]
  1. Drexel Univ., Philadelphia, PA (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Published Article
Journal Name:
Progress in Natural Science
Additional Journal Information:
Journal Volume: 25; Journal Issue: 6; Journal ID: ISSN 1002-0071
Publisher:
Chinese Materials Research Society
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)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; supercapacitor; carbide-derived carbon; neutron scattering; energy storage; porous materials; surface chemistry
OSTI Identifier:
1233943
Alternate Identifier(s):
OSTI ID: 1265882