聚吡咯
超级电容器
MXenes公司
静电纺丝
材料科学
电极
纳米纤维
纳米技术
电容
双金属片
法拉第效率
化学工程
复合材料
电化学
化学
聚合物
聚合
工程类
物理化学
冶金
金属
作者
Ishwor Pathak,Debendra Acharya,Kisan Chhetri,Prakash Chandra Lohani,Tae Hoon Ko,Alagan Muthurasu,Subhangi Subedi,Taewoo Kim,Syafiqah Saidin,Bipeen Dahal,Hee Young Kim
标识
DOI:10.1016/j.cej.2023.143388
摘要
Effective customization of Ti3C2Tx MXenes by electrospinning technique is crucial for the preparation of freestanding/flexible electrodes exhibiting enhanced performance in supercapacitors. Herein, we prepared MXenes containing hollow carbon nanofibers (MXHCNF) by co-axial electrospinning, and the inside-out of MXHCNF is decorated with polypyrrole layers (PPy@MXHCNF), which is sufficiently flexible, conductive, and highly functionalized with a unique trilayer morphology. Using the self-designed electroactive PPy@MXHCNF, a ZnCoMOF is homogeneously grown. The as-prepared bimetallic MOF on PPy@MXHCNF is used as a common precursor with which to fabricate the positive (ZCO@PPy@MXHCNF) and negative (NPC@MXHCNF) electrodes by a controlled heat treatment process using a “two from one” strategy. The freestanding positive and negative electrodes provide specific capacitances of 1567.5 F g−1 and 477.2 F g−1 at 1 A g−1, respectively, with high capacitance retention, cyclic stability, and coulombic efficiency. A flexible asymmetric device (ZCO@PPy@MXHCNF//NPC@MXHCNF) is assembled, and it exhibits an energy density of 61.3 Wh kg−1 at a power density of 796.8 W kg−1 and 92.8% capacitance retention after 10,000 GCD cycles. This work provides a unique approach involving MXene modification, polypyrrole decorated electrospun MXHCNFs as efficient substrates for freestanding electrodes, and the use of bimetallic MOF as a common strategic route for both positive and negative electrodes in flexible asymmetric supercapacitors.
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