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High-yield bottom-up synthesis of 2D metal organic frameworks and their derived ultrathin carbon nanosheets for energy storage

Abstract

The two-dimensional (2D) metal organic framworks (MOFs) have been considered as promising precursors for the synthesis of 2D carbon materials for energy storage. However, the high costs and low yields of the synthetic methods for 2D MOFs are major obstacles for the preparation of 2D carbon materials from 2D MOFs. Herein, we report a facile and low-cost bottom-up synthesis of the ultrathin Zn(bim)(OAc) MOF nanosheets (with a thickness of ~5 nm and a high yield of ~65%) and their derived N-doped porous ultrathin (2.5±0.8 nm) carbon nanosheets (UT-CNSs) for energy storage. The UT-CNS shows a capacitance of 278 F g-1 at a high current density of 10 A g-1, which is the highest among the reported MOF-derived carbon materials for supercapacitor electrodes. In addition, the UT-CNS also exhibits a high reversible capacity of 553 mAh g-1 at 10 A g-1 and keeps a 100% coulombic efficiency during the 1000 cycles at 2 A g-1 as an anode material for lithium ion batteries. The superior electrochemical properties of the UT-CNS, especially at high current densities, are mainly due to its ultrathin morphology, large specific surface area, high conductivity, and suitable porous structure. This work provides a new strategy for the high-yield and low-cost synthesis of the ultrathin MOF nanosheets as well as the 2D carbon materials and their metal or metal oxide composites for various applications.

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Publication details

The article was received on 05 Aug 2017, accepted on 25 Dec 2017 and first published on 27 Dec 2017


Article type: Paper
DOI: 10.1039/C7TA06916B
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    High-yield bottom-up synthesis of 2D metal organic frameworks and their derived ultrathin carbon nanosheets for energy storage

    K. ZHAO, S. Liu, G. Ye, Q. Gan, Z. Zhou and Z. He, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA06916B

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