MnO2-based nanostructures for high-performance supercapacitors

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Abstract

The recent progress, challenges and promising future on design, synthesis and fabrication of MnO2 for supercapacitors are reviewed and discussed.

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Laser scribing of high-performance and flexible graphene-based electrochemical capacitors.

Maher F El-Kady, Veronica A. Strong, Sergey Dubin … (2012)

Although electrochemical capacitors (ECs), also known as supercapacitors or ultracapacitors, charge and discharge faster than batteries, they are still limited by low energy densities and slow rate capabilities. We used a standard LightScribe DVD optical drive to do the direct laser reduction of graphite oxide films to graphene. The produced films are mechanically robust, show high electrical conductivity (1738 siemens per meter) and specific surface area (1520 square meters per gram), and can thus be used directly as EC electrodes without the need for binders or current collectors, as is the case for conventional ECs. Devices made with these electrodes exhibit ultrahigh energy density values in different electrolytes while maintaining the high power density and excellent cycle stability of ECs. Moreover, these ECs maintain excellent electrochemical attributes under high mechanical stress and thus hold promise for high-power, flexible electronics.

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Three-dimensional flexible and conductive interconnected graphene networks grown by chemical vapour deposition.

Zongping Chen, Wencai Ren, Libo Gao … (2011)

Integration of individual two-dimensional graphene sheets into macroscopic structures is essential for the application of graphene. A series of graphene-based composites and macroscopic structures have been recently fabricated using chemically derived graphene sheets. However, these composites and structures suffer from poor electrical conductivity because of the low quality and/or high inter-sheet junction contact resistance of the chemically derived graphene sheets. Here we report the direct synthesis of three-dimensional foam-like graphene macrostructures, which we call graphene foams (GFs), by template-directed chemical vapour deposition. A GF consists of an interconnected flexible network of graphene as the fast transport channel of charge carriers for high electrical conductivity. Even with a GF loading as low as ∼0.5 wt%, GF/poly(dimethyl siloxane) composites show a very high electrical conductivity of ∼10 S cm(-1), which is ∼6 orders of magnitude higher than chemically derived graphene-based composites. Using this unique network structure and the outstanding electrical and mechanical properties of GFs, as an example, we demonstrate the great potential of GF/poly(dimethyl siloxane) composites for flexible, foldable and stretchable conductors. © 2011 Macmillan Publishers Limited. All rights reserved

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Materials science. Electrochemical capacitors for energy management.

John Miller, Patrice Simon (2008)

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Journal

Journal ID (publisher-id): JMCAET

Title: J. Mater. Chem. A

Abbreviated Title: J. Mater. Chem. A

Publisher: Royal Society of Chemistry (RSC)

ISSN (Print): 2050-7488

ISSN (Electronic): 2050-7496

Publication date Created: 2015

Publication date (Print): 2015

Volume: 3

Issue: 43

Pages: 21380-21423

Article

DOI: 10.1039/C5TA05523G

SO-VID: eba811e2-790d-4f4a-820e-ecd92ed632bd

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MnO2-based nanostructures for high-performance supercapacitors

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Laser scribing of high-performance and flexible graphene-based electrochemical capacitors.

Three-dimensional flexible and conductive interconnected graphene networks grown by chemical vapour deposition.

Materials science. Electrochemical capacitors for energy management.

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