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2D MOF Nanoflake-Assembled Spherical-Micro-Structures for Enhanced Supercapacitor and Electrocatalysis Performances
Nano-Micro Letters ( IF 26.6 ) Pub Date : 2017-02-14 , DOI: 10.1007/s40820-017-0144-6
Huicong Xia , Jianan Zhang , Zhao Yang , Shiyu Guo , Shihui Guo , Qun Xu

Metal–organic frameworks (MOFs) are of great interest as potential electrochemically active materials. However, few studies have been conducted into understanding whether control of the shape and components of MOFs can optimize their electrochemical performances due to the rational realization of their shapes. Component control of MOFs remains a significant challenge. Herein, we demonstrate a solvothermal method to realize nanostructure engineering of 2D nanoflake MOFs. The hollow structures with Ni/Co- and Ni-MOF (denoted as Ni/Co-MOF nanoflakes and Ni-MOF nanoflakes) were assembled for their electrochemical performance optimizations in supercapacitors and in the oxygen reduction reaction (ORR). As a result, the Ni/Co-MOF nanoflakes exhibited remarkably enhanced performance with a specific capacitance of 530.4 F g-1 at 0.5 A g-1 in 1 M LiOH aqueous solution, much higher than that of Ni-MOF (306.8 F g-1) and ZIF-67 (168.3 F g-1), a good rate capability, and a robust cycling performance with no capacity fading after 2000 cycles. Ni/Co-MOF nanoflakes also showed improved electrocatalytic performance for the ORR compared to Ni-MOF and ZIF-67. The present work highlights the significant role of tuning 2D nanoflake ensembles of Ni/Co-MOF in accelerating electron and charge transportation for optimizing energy storage and conversion devices.



中文翻译:

二维MOF纳米片组装的球形微结构,可增强超级电容器和电催化性能

金属有机骨架(MOF)作为潜在的电化学活性材料备受关注。但是,由于合理地实现了MOF形状的控制,因此很少有研究来了解对MOF的形状和成分的控制是否可以优化其电化学性能。MOF的组件控制仍然是一个重大挑战。在这里,我们演示了一种溶剂热方法来实现2D纳米片状MOF的纳米结构工程。组装了具有Ni / Co-和Ni-MOF的空心结构(分别表示为Ni / Co-MOF纳米薄片和Ni-MOF纳米薄片),以优化其在超级电容器和氧还原反应(ORR)中的电化学性能。结果,Ni / Co-MOF纳米片表现出显着增强的性能,比电容为530.4 F g -1在0.5 A克-1中加入1M LiOH水溶液,比Ni-MOF(306.8 F G的高得多的-1)和ZIF-67(168.3 F G -1),良好的倍率性能,和一个强大的循环性能,在2000次循环后无容量衰减。与Ni-MOF和ZIF-67相比,Ni / Co-MOF纳米片对ORR的电催化性能也有所改善本工作强调了调整Ni / Co-MOF的2D纳米片状集成体在加速电子和电荷传输以优化能量存储和转换设备方面的重要作用。

更新日期:2017-07-22
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