3D oxidation-resistant MXene electrode supported by softened wood toward high-performance flexible supercapacitors

Document Type

Article

Publication Date

9-15-2024

Abstract

With the rapid evolution of emerging electronics, MXene materials hold great potential in developing high-performance electrodes for energy storage devices. However, MXenes usually suffer from severe self-stacking, mechanical fragility and susceptibility to oxidation, greatly limiting their further applications. Herein, a simple yet potent strategy is proposed to solve the above challenges by constructing a 3D porous and oxidation-resistant MXene-ascorbic acid/flexible wood electrode (MVFW). FW is employed as a soft and porous framework to solve the self-stacking and mechanical fragility problems of MXenes, ensuring the continuously conductive pathways and rapid ion transport. Ascorbic acid (VC) is introduced to further inhibit the restacking of MXenes and protect them against oxidation, improving the accessibility of active sites/ions and oxidation-resistant stability (capacitance retention of 70 % even after 2 months) of the electrode. Such electrode possesses an intrinsic flexibility with remarkable tensile strength (0.66 MPa) and toughness (0.96 MJ m−3), excellent electrical conductivity (5.4 S cm−1), large areal capacitance (1301 mF cm−2 at 5 mA cm−2) and high rate performance (75 %). The symmetric flexible supercapacitor demonstrates a notable energy density (13.9 μWh cm−2 at 139.7 μW cm−2) and favorable stability after 10,000 cycles or under bending at various angles (30°, 90° and 120°). This study opens up a promising path for the development of flexible, porous and oxidation-resistant MXene electrodes for next-generation wearable energy devices.

Publication Source (Journal or Book title)

Chemical Engineering Journal

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