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

Journal Article · · Microporous and Mesoporous Materials

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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Energy Frontier Research Centers (EFRC) (United States). Fluid Interface Reactions, Structures and Transport Center (FIRST)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1265858
Alternate ID(s):
OSTI ID: 1251519
Journal Information:
Microporous and Mesoporous Materials, Vol. 218, Issue C; ISSN 1387-1811
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 30 works
Citation information provided by
Web of Science

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Cited By (6)

Improving control of carbide-derived carbon microstructure by immobilization of a transition-metal catalyst within the shell of carbide/carbon core–shell structures journal January 2019
Activated Carbon in the Third Dimension—3D Printing of a Tuned Porous Carbon journal August 2019
Side-chain effects on the capacitive behaviour of ionic liquids in microporous electrodes journal August 2019
Pore size control of polymer-derived carbon adsorbent and its application for dye removal journal December 2018
Activated Carbon in the Third Dimension—3D Printing of a Tuned Porous Carbon text January 2019
Side-chain effects on the capacitive behaviour of ionic liquids in microporous electrodes text January 2019

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