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Title: Synthesis of carbon core–shell pore structures and their performance as supercapacitors

High-power supercapacitors require excellent electrolyte mobility within the pore network and high electrical conductivity for maximum capacitance and efficiency. Achieving high power typically requires sacrificing energy densities, as the latter demands a high specific surface area and narrow porosity that impedes ion transport. Here, we present a novel solution for this optimization problem: a nanostructured core–shell carbonaceous material that exhibits a microporous carbon core surrounded by a mesoporous, graphitic shell. The tunable synthesis parameters yielded a structure that features either a sharp or a gradual transition between the core and shell sections. Electrochemical supercapacitor testing using organic electrolyte revealed that these novel core–shell materials outperform carbons with homogeneous pore structures. The hybrid core–shell materials showed a combination of good capacitance retention, typical for the carbon present in the shell and high specific capacitance, typical for the core material. These materials achieved power densities in excess of 40 kW kg-1 at energy densities reaching 27 Wh kg-1.
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [2] ; ORCiD logo [1]
  1. University of Erlangen (Germany)
  2. Drexel Univ., Philadelphia, PA (United States)
Publication Date:
OSTI Identifier:
1265858
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Microporous and Mesoporous Materials
Additional Journal Information:
Journal Volume: 218; Journal Issue: C; Journal ID: ISSN 1387-1811
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)
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; 36 MATERIALS SCIENCE