Issue 38, 2019

High-performance supercabatteries using graphite@diamond nano-needle capacitor electrodes and redox electrolytes

Abstract

Supercabatteries have the characteristics of supercapacitors and batteries, namely high power and energy densities as well as long cycle life. To construct them, capacitor electrodes with wide potential windows and/or redox electrolytes are required. Herein, graphite@diamond nano-needles and an aqueous solution of Fe(CN)63−/4− are utilized as the capacitor electrode and the electrolyte, respectively. This diamond capacitor electrode has a nitrogen-doped diamond core and a nano-graphitic shell. In 0.05 M Fe(CN)63−/4− + 1.0 M Na2SO4 aqueous solution, the fabricated supercabattery has a capacitance of 66.65 mF cm−2 at a scan rate of 10 mV s−1. It is stable over 10 000 charge/discharge cycles. The symmetric supercabattery device assembled using a two-electrode system possesses energy and power densities of 10.40 W h kg−1 and 6.96 kW kg−1, respectively. These values are comparable to those of other energy storage devices. Therefore, diamond supercabatteries are promising for many industrial applications.

Graphical abstract: High-performance supercabatteries using graphite@diamond nano-needle capacitor electrodes and redox electrolytes

  • This article is part of the themed collection: Nanocarbons

Supplementary files

Article information

Article type
Paper
Submitted
15 ago 2019
Accepted
06 set 2019
First published
06 set 2019
This article is Open Access
Creative Commons BY-NC license

Nanoscale, 2019,11, 17939-17946

High-performance supercabatteries using graphite@diamond nano-needle capacitor electrodes and redox electrolytes

S. Yu, K. J. Sankaran, S. Korneychuk, J. Verbeeck, K. Haenen, X. Jiang and N. Yang, Nanoscale, 2019, 11, 17939 DOI: 10.1039/C9NR07037K

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