A facile “thick to thin” strategy for integrating high volumetric energy density and excellent flexibility into MXene/wood free-standing electrode for supercapacitors
Chemical Engineering Journal, ISSN: 1385-8947, Vol: 460, Page: 141733
2023
- 24Citations
- 6Captures
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Article Description
Wood-based thick electrodes (>400 μm) always exhibit low volumetric loading of active material and poor flexibility. Herein, a “thick to thin” strategy including densification and low-temperature heating treatment is innovatively proposed and then applied in a MXene (Ti 3 C 2 T x )/wood thick electrode (500 μm) to simultaneously realize large volumetric loading and excellent flexibility. It is found that the densification can significantly increase the volumetric mass loading of Ti 3 C 2 T x by 10 times owing to the great reduction of the electrode thickness (50 μm), and endow the electrode with excellent flexibility by changing porous microstructure to compact microstructure. Furthermore, the low-temperature heating treatment greatly improves the electrochemical performances of the electrode by generating meso -/macropores for ion transport and exposing more active sites to the electrolyte. After conducting our proposed strategy, the optimized electrode exhibits 9 times higher volumetric capacitance (reaching 187F cm −3 ) than the control electrode, and still has a high rate capability of 77 % when the current density increases by 100 folds. Additionally, the optimized free-standing electrode is used to fabricate a quasi-solid-state supercapacitor which demonstrates stable capacitive behaviors during bending and a large volumetric energy density of 3 mWh cm −3 at 30.6 mW cm −3.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S1385894723004643; http://dx.doi.org/10.1016/j.cej.2023.141733; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85150345383&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S1385894723004643; https://dx.doi.org/10.1016/j.cej.2023.141733
Elsevier BV
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