MOF-derived CoFe2O4 nanorods anchored in MXene nanosheets for all pseudocapacitive flexible supercapacitors with superior energy storage

MOF-derived CoFe2O4 nanorods anchored in MXene nanosheets for all pseudocapacitive flexible supercapacitors with superior energy storage
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MOF 衍生的 CoFe2O4 纳米棒锚定在 MXene 纳米片中,适用于具有卓越能量存储的所有赝电容柔性超级电容器

DOI:
10.1016/j.apsusc.2020.147584
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发表时间:
2020-12
影响因子:
6.7
通讯作者:
Xu Jian
Xu Jian
中科院分区:
材料科学1区
文献类型:
--
作者:
Xie Wanyi;Wang Yanzi;Zhou Jie;Zhang Meng;Yu Jiali;Zhu Caizhen;Xu Jian

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在这项工作中,MOF衍生的Co-Fe氧化物多孔纳米棒被引入到独立的MXene膜中,以产生具有优异的可变形性和可编辑性的高性能柔性电极。所制备的复合膜电极具有以下优点:MXene层作为粘合剂和导电添加剂包覆Co-Fe氧化物,这可以有效地促进电荷转移并保持膜电极的优异柔性。同时,Co-Fe氧化物可以起到隔离层的作用,从而扩大层间距离,改善离子在电极中的传输路径。结果,最佳Co-Fe氧化物/Ti 3C 2 TX复合纸在1 M LiCl电解质中表现出2467.6 F cm− 3的显著体积电容。当组装成柔性对称超级电容器时,可以获得356.4 mF cm− 2的出色比面积电容。同时,柔性超级电容器表现出优异的循环性能,在10 000次充电/放电循环后的电容保持率高达88.2%,以及在100次机械弯曲循环后稳定的电化学储能稳定性,表明其在未来柔性和便携式储能设备中具有巨大的应用潜力。
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/Ti3C2TXcomposite paper manifests a remarkable volumetric capacitance of 2467.6 F cm−3in 1 M LiCl electrolyte. When assembled into a flexible symmetrical supercapacitor, an outstanding specific areal capacitance of 356.4 mF cm−2can 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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