Issue 31, 2024

Wood-derived flexible supercapacitors for anti-freezing green power sources

Abstract

Highly porous wood-derived electronics have attracted tremendous attention for the fabrication of high-performance supercapacitors (SCs) owing to their environmental benignity, natural abundance, renewability, and biodegradability. However, it is challenging to overcome the intrinsic rigidity and sluggish electrochemical reaction kinetics of wood-based SCs at low temperatures. Herein, we demonstrate an anti-freezing flexible SC (AF-FSC) based on delignified wood electrodes with an organohydrogen electrolyte. The chemical delignification process removes hemicellulose and lignin from natural wood, resulting in a softwood skeleton electrode. When assembled with a solid hydrogel electrolyte, the AF-FSC exhibits high mechanical flexibility over 93% capacitance retention after 1000 bending/twisting cycles at −30 °C. Besides, high areal capacitance (285.2 mF cm−2) at −30 °C is achieved, which is higher than most wood derivatives operating at room temperature. The unique properties of the anti-freezing flexible AF-FSC make it a green renewable power source for driving multi-functional electronic components in real-life scenarios.

Graphical abstract: Wood-derived flexible supercapacitors for anti-freezing green power sources

Supplementary files

Article information

Article type
Paper
Submitted
04 Apr 2024
Accepted
26 Jun 2024
First published
01 Jul 2024

J. Mater. Chem. A, 2024,12, 20088-20096

Wood-derived flexible supercapacitors for anti-freezing green power sources

H. Ma, Q. Zhao, P. Cheng, X. Geng, H. Tao, Z. Zhang, Y. Jiang, J. Ma, K. Yang, Q. Liu, H. Zhang, Z. Liang, J. Li, T. Wang, M. Xue and N. Zhu, J. Mater. Chem. A, 2024, 12, 20088 DOI: 10.1039/D4TA02190H

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