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Asymmetric carbon nanohorn enabled soft capacitors with high power density and ultra low cutoff frequency

Li, Benxuan, Zhan, Shijie, Wang, Haolan, Hou, Bo and Amaratunga, Gehan A. J. 2020. Asymmetric carbon nanohorn enabled soft capacitors with high power density and ultra low cutoff frequency. Advanced Materials Technologies 5 (9) , 2000372. 10.1002/admt.202000372

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Abstract

Flexible capacitors are a promising power source for foldable and biological electronic devices. Although various materials and device structures have been explored, they are still limited by low energy densities and slow rate capabilities compared to their rigid counterparts. Here, asymmetric carbon nanohorns are proposed as an active material to fabricate flexible solid-state carbon wire (CW)-based electrochemical supercapacitors (ss-CWECs) which exhibit high power density and ultra-low cutoff frequency. By controlling the electric arc reaction at low temperature (77 K), asymmetric single-wall carbon nanohorns (SWCNHs) have been synthesised with high yield. Based on microscopy and electrochemical characterisation, the fundamental reaction mechanism in polyvinyl-based electrolyte system has been elucidated, as being associated with deprotonation reaction at acid, base and elevated temperature conditions. Additionally, by using activated carbon, multi-walled carbon nanotubes and SWCNHs as hybrid electrode materials (5:1:1), remarkable specific length capacitance of 48.76 mFcm-1 and charge-discharge stability (over 2000 times cycles) of ss-CWECs have been demonstrated, which is the highest reported to date. Furthermore, a highpass filter for eliminating ultra-low electronic noise has been demonstrated, which enables an optical Morse Code communication system to be operated. Current results confirm the SWCNHs as promising materials for high-performance soft electronics and energy storage applications.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Wiley
ISSN: 2365-709X
Funders: EPSRC
Date of First Compliant Deposit: 2 June 2020
Date of Acceptance: 1 June 2020
Last Modified: 11 Sep 2020 14:22
URI: http://orca.cf.ac.uk/id/eprint/132121

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