Journal
NANO-MICRO LETTERS
Volume 9, Issue 4, Pages -Publisher
SHANGHAI JIAO TONG UNIV PRESS
DOI: 10.1007/s40820-017-0144-6
Keywords
Metal-organic frameworks; Nanoflakes; Spherical microstructure; Supercapacitor; Oxygen reduction reaction
Funding
- National Natural Science Foundation of China [21571157, U1604123, 51473149]
- Outstanding Young Talent Research Fund of Zhengzhou University [1521320001]
- Open Project Foundation of Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University [2017-29]
- Open Project Foundation of Key Laboratory of Inorganic Synthesis and Preparation of Jilin University
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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 ofMOFs 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/CoMOF 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 ORRcompared 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.
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