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Issue 15, 2019
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Candle soot: onion-like carbon, an advanced anode material for a potassium-ion hybrid capacitor

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Abstract

Although potassium-ion storage technology has started to receive significant attention, its development is still in its infancy; thus, exploration of suitable electrode materials is critical at this stage. Herein, onion-like carbon (OLC) was obtained from the combustion soot as the candle burnt and used as a promising anode material for potassium-ion storage. This OLC delivered high reversible capacity and exhibited good rate performance and cycling stability. Taking advantage of these features, a potassium-ion hybrid capacitor (PIHC) with OLC as the battery-type anode and activated carbon as the capacitor-type cathode was constructed. The constructed device displayed the high energy density of 142 W h kg−1, the ultrahigh power output of 21 kW kg−1, and a long cycling life (83% capacity retention after 6000 cycles). Thus, this device may simultaneously cater to the requirements of high power and high energy densities in a wide range of applications.

Graphical abstract: Candle soot: onion-like carbon, an advanced anode material for a potassium-ion hybrid capacitor

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Article information


Submitted
13 Feb 2019
Accepted
11 Mar 2019
First published
13 Mar 2019

J. Mater. Chem. A, 2019,7, 9247-9252
Article type
Paper

Candle soot: onion-like carbon, an advanced anode material for a potassium-ion hybrid capacitor

J. Chen, B. Yang, H. Li, P. Ma, J. Lang and X. Yan, J. Mater. Chem. A, 2019, 7, 9247
DOI: 10.1039/C9TA01653H

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