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Issue 4, 2017
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Battery-like supercapacitors from diamond networks and water-soluble redox electrolytes

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Abstract

Enhanced performance of electrochemical capacitors can be achieved by larger capacitances as well as higher power and energy densities. In this work, such battery-like supercapacitors were fabricated using a three-dimensional and conductive diamond network as the capacitor electrode and water-soluble redox couples as the electrolyte. In 0.05 M Fe(CN)63−/4− + 1.0 M Na2SO4 aqueous solution, a capacitance of 73.42 mF cm−2 was obtained at a current density of 1 mA cm−2. This value is 10 000 times higher than the capacitance of diamond electric double layer capacitors (EDLCs). The energy and power densities of a fabricated diamond network symmetric pseudocapacitor were up to 56.50 W h kg−1 and 13.7 kW kg−1, respectively. Compared with those of diamond EDLCs obtained with the same cell voltage, they are enhanced about 3500 and 1440 fold, respectively. Therefore the combination of diamond networks and water-soluble redox electrolytes is a novel approach to construct electrochemical capacitors and thus bridges the gap between normal dielectric capacitors and rechargeable batteries.

Graphical abstract: Battery-like supercapacitors from diamond networks and water-soluble redox electrolytes

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Supplementary files

Article information


Submitted
04 Oct 2016
Accepted
13 Dec 2016
First published
15 Dec 2016

J. Mater. Chem. A, 2017,5, 1778-1785
Article type
Paper

Battery-like supercapacitors from diamond networks and water-soluble redox electrolytes

S. Yu, N. Yang, H. Zhuang, S. Mandal, O. A. Williams, B. Yang, N. Huang and X. Jiang, J. Mater. Chem. A, 2017, 5, 1778
DOI: 10.1039/C6TA08607A

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