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

Yu, Siyu, Yang, Nianjun, Zhuang, Hao, Mandal, Soumen ORCID: https://orcid.org/0000-0001-8912-1439, Williams, Oliver A. ORCID: https://orcid.org/0000-0002-7210-3004, Yang, Bing, Huang, Nan and Jiang, Xin 2017. Battery-like supercapacitors from diamond networks and water-soluble redox electrolytes. Journal of Materials Chemistry A 5 (4) , pp. 1778-1785. 10.1039/C6TA08607A

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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.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QC Physics
Publisher:	Royal Society of Chemistry
ISSN:	2050-7488
Date of Acceptance:	13 December 2016
Last Modified:	02 Nov 2022 10:13
URI:	https://orca.cardiff.ac.uk/id/eprint/97857

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