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Ultra-thick electrodes based on activated wood-carbon towards high-performance quasi-solid-state supercapacitors

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Abstract

Wood carbon (WC)-derived thick electrode design has recently received increasing interest because of its high energy density at the device level. Herein, a facile, low-cost, and efficient strategy by surface engineering to synthesize ultrathick electrodes of quasi-solid-state symmetric supercapacitors (SSCs) based on activated wood-carbon (AWC) monoliths is presented. The AWC as a freestanding ultrathick electrode shows an impressive areal capacitance of 6.85 F cm−2 at 1 mA cm−2 and 4.55 F cm−2 at 20 mA cm−2. Furthermore, a quasi-solid-state SSC assembled by two identical AWC monoliths delivers an excellent energy density of 0.23 mW h cm−2 (4.59 W h kg−1 and 0.77 W h L−1) at 500 mW cm−2 (9.9 mW kg−1 and 2500 W L−1) while maintaining a capacitance retention of 86% after 10 000 cycles. The remarkable electrochemical performance is associated with the structural integrity of natural wood, the introduction of oxygen-containing functional groups, and the ultrathick electrode design, which significantly enhance electroactive material loading and device integration.

Graphical abstract: Ultra-thick electrodes based on activated wood-carbon towards high-performance quasi-solid-state supercapacitors

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Article information


Submitted
15 Nov 2019
Accepted
16 Dec 2019
First published
16 Dec 2019

Phys. Chem. Chem. Phys., 2020, Advance Article
Article type
Paper

Ultra-thick electrodes based on activated wood-carbon towards high-performance quasi-solid-state supercapacitors

W. Zhang, T. Liu, J. Mou, J. Huang and M. Liu, Phys. Chem. Chem. Phys., 2020, Advance Article , DOI: 10.1039/C9CP06181A

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