期刊
APPLIED SURFACE SCIENCE
卷 534, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2020.147584
关键词
MXene; MOF; Co-Fe oxide; Flexible supercapacitor
类别
资金
- National Natural Science Foundation of China [51673117, 21805193, 51973118]
- Postdoctoral Science Foundation of China [2019M650212]
- Key R&D Program of Guangdong Province [2019B010929002, 2019B010941001]
- Science and Technology Innovation Commission of Shenzhen [JCYJ20170817094628397, JCYJ20170818093832350, JCYJ2017-0818112409808, JCYJ20170818100112531, JCYJ20180507-084711069, JCYJ20180305125319991]
In this work, a MOF-derived Co-Fe oxide porous nanorod is introduced into the freestanding MXene film to produce a high-performance flexible electrode with excellent deformability and editability. The as-prepared composite film electrode demonstrates several advantages: MXene layer functions as a binder and conductive additive to coat Co-Fe oxide, which can effectively facilitate charge transfer and maintain the excellent flexibility of the film electrode. In the meantime, Co-Fe oxide can work as a spacer, thereby expanding the interlayer distance, improving the ion transmission path in the electrode. As a result, the optimal Co-Fe oxide/Ti3C2Tx composite paper manifests a remarkable volumetric capacitance of 2467.6 F cm(-3) in 1 M LiCl electrolyte. When assembled into a flexible symmetrical supercapacitor, an outstanding specific areal capacitance of 356.4 mF cm(-2) can be obtained. Meanwhile, the flexible supercapacitor demonstrates excellent cycling performance with a high capacitance retention of 88.2% after 10 000 charge/discharge cycles, as well as stable electrochemical energy storage stability after 100 cycles of mechanical bending, indicating its great application potential in future flexible and portable energy storage equipment.
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