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Ultrafast post-synthetic modification of a pillared cobalt(II)-based metal-organic framework via sulfurization of its pores for high-performance supercapacitors

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Author(s)

Reza Abazari, Soheila Sanati, Ali Morsali, Alexandra M. Z. Slawin, Cameron L. Carpenter-Warren, Wei Chen, Anmin Zheng

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Abstract

In this study, a fast and simple technique (2 min) has been developed to modify the pores of a novel micro-porous, amide-functionalized Co(II)-based MOF [Co(oba)2(bpfb)4](DMF)2, TMU-61, (H2oba = 4,4′-oxybis(benzoic acid) and bpfb = N,N′-bis-(4-pyridylformamide)-1,4-benzenediamine). The material produced through sulfurization of TMU-61, at ambient temperatures, can be used as an appropriate electrode material for supercapacitors (SCs). The highest specific capacitance of a system with three electrodes is 636.6 F g−1 at a current density of 5 A g−1, and the specific capacitance retention is nearly 94% after 6000 cycles, demonstrating an impressive long-term cycling stability. The asymmetric SC (ASC) based on S-TMU-61 showed the highest energy density (25.73 W h kg−1) and power density (2549.3 W kg−1). Additionally, it is observed that two S-TMU-61 ASCs connected in series are enough to supply energy for lighting blue, yellow, green and red light emitting diodes (LED) for 22 min and driving a mini rotating motor, demonstrating the excellent potential of the new material for a variety of applications. To the best of the authors’ knowledge, this is the first study to use post synthetic modification of a MOF with a suitable pore size to optimize the material for use in SCs.

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Original languageEnglish
Pages (from-to)11953-11966
Number of pages14
JournalJournal of Materials Chemistry A
Volume7
Issue number19
Early online date3 Apr 2019
DOIs
Publication statusPublished - 21 May 2019

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