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Hierarchically Porous Carbon with Manganese Oxides as Highly Efficient Electrode for Asymmetric Supercapacitors

Hierarchically Porous Carbon with Manganese Oxides as Highly Efficient Electrode for Asymmetric... A promising energy storage material, MnO2/hierarchically porous carbon (HPC) nanocomposites, with exceptional electrochemical performance and ultrahigh energy density was developed for asymmetric supercapacitor applications. The microstructures of MnO2/HPC nanocomposites were characterized by transmission electron microscopy, scanning transmission electron microscopy, and electron dispersive X‐ray elemental mapping analysis. The 3–5 nm MnO2 nanocrystals at mass loadings of 7.3–10.8 wt % are homogeneously distributed onto the HPCs, and the utilization efficiency of MnO2 on specific capacitance can be enhanced to 94–96 %. By combining the ultrahigh utilization efficiency of MnO2 and the conductive and ion‐transport advantages of HPCs, MnO2/HPC electrodes can achieve higher specific capacitance values (196 F g−1) than those of pure carbon electrodes (60.8 F g−1), and maintain their superior rate capability in neutral electrolyte solutions. The asymmetric supercapacitor consisting of a MnO2/HPC cathode and a HPC anode shows an excellent performance with energy and power densities of 15.3 Wh kg−1 and 19.8 kW kg−1, respectively, at a cell voltage of 2 V. Results obtained herein demonstrate the excellence of MnO2/HPC nanocomposites as energy storage material and open an avenue to fabricate the next generation supercapacitors with both high power and energy densities. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png ChemSusChem - Chemistry and Sustainability, Energy & Materials Wiley

Hierarchically Porous Carbon with Manganese Oxides as Highly Efficient Electrode for Asymmetric Supercapacitors

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References (47)

Publisher
Wiley
Copyright
"Copyright © 2014 Wiley Subscription Services, Inc., A Wiley Company"
ISSN
1864-5631
eISSN
1864-564X
DOI
10.1002/cssc.201301014
pmid
24504702
Publisher site
See Article on Publisher Site

Abstract

A promising energy storage material, MnO2/hierarchically porous carbon (HPC) nanocomposites, with exceptional electrochemical performance and ultrahigh energy density was developed for asymmetric supercapacitor applications. The microstructures of MnO2/HPC nanocomposites were characterized by transmission electron microscopy, scanning transmission electron microscopy, and electron dispersive X‐ray elemental mapping analysis. The 3–5 nm MnO2 nanocrystals at mass loadings of 7.3–10.8 wt % are homogeneously distributed onto the HPCs, and the utilization efficiency of MnO2 on specific capacitance can be enhanced to 94–96 %. By combining the ultrahigh utilization efficiency of MnO2 and the conductive and ion‐transport advantages of HPCs, MnO2/HPC electrodes can achieve higher specific capacitance values (196 F g−1) than those of pure carbon electrodes (60.8 F g−1), and maintain their superior rate capability in neutral electrolyte solutions. The asymmetric supercapacitor consisting of a MnO2/HPC cathode and a HPC anode shows an excellent performance with energy and power densities of 15.3 Wh kg−1 and 19.8 kW kg−1, respectively, at a cell voltage of 2 V. Results obtained herein demonstrate the excellence of MnO2/HPC nanocomposites as energy storage material and open an avenue to fabricate the next generation supercapacitors with both high power and energy densities.

Journal

ChemSusChem - Chemistry and Sustainability, Energy & Materials – Wiley

Published: Mar 1, 2014

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