MXene enhanced 3D needled waste denim felt for high-performance flexible supercapacitors

Wei Fan*, Qi Wang, Kai Rong, Yang Shi, Wanxi Peng*, Handong Li, Zhanhu Guo, Ben Bin Xu, Hua Hou, Hassan Algadi, Shengbo Ge*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


MXene, a transition metal carbide/nitride, has been prominent as an ideal electrochemical active material for supercapacitors. However, the low MXene load limits its practical applications. As environmental concerns and sustainable development become more widely recognized, it is necessary to explore a greener and cleaner technology to recycle textile by-products such as cotton. The present study proposes an effective 3D fabrication method that uses MXene to fabricate waste denim felt into ultralight and flexible supercapacitors through needling and carbonization. The 3D structure provided more sites for loading MXene onto Z-directional fiber bundles, resulting in more efficient ion exchange between the electrolyte and electrodes. Furthermore, the carbonization process removed the specific adverse groups in MXenes, further improving the specific capacitance, energy density, power density and electrical conductivity of supercapacitors. The electrodes achieve a maximum specific capacitance of 1748.5 mF cm−2 and demonstrate remarkable cycling stability maintaining more than 94% after 15,000 galvanostatic charge/discharge cycles. Besides, the obtained supercapacitors present a maximum specific capacitance of 577.5 mF cm−2, energy density of 80.2 μWh cm−2 and power density of 3 mW cm−2, respectively. The resulting supercapacitors can be used to develop smart wearable power devices such as smartwatches, laying the foundation for a novel strategy of utilizing waste cotton in a high-quality manner.
Original languageEnglish
Article number36
Number of pages12
JournalNano-Micro Letters
Issue number1
Publication statusPublished - 29 Nov 2023

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