Highly Interconnected Nanorods and Nanosheets Based on a Hierarchically Layered Metal-Organic Framework for a Flexible, High-Performance Energy Storage Device

Chang Soo Lee, Juyoung Moon, Jung Tae Park, Jong Hak Kim

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)

Abstract

The pseudocapacitors based on metal-organic frameworks (MOFs) are one of the state-of-the-art candidates to improve the future energy storage systems because of their high porosity, diverse functional groups, and potential as the template. In this study, the direct growth of a urea-assisted hierarchically layered cobalt-based MOF (u-hl-MOF) on Ni foam and direct growth of nanorods and nanosheets on the surface of the u-hl-MOF via the MOF-mediated approach without the addition of a cobalt precursor are reported. After the annealing process with sulfur powder under an Ar flow is complete, only the surface of the u-hl-MOF is converted into cobalt sulfide@carbon (Co1-xS@C), whereas the bulk internal u-hl-MOF remains without any degradation. Therefore, a core-shell structure of u-hl-MOF@Co1-xS@C (u-hl-MSC) is formed, which exhibits a high areal specific capacitance of 13.1 F cm-2 with a three-electrode system. A solid-state flexible asymmetric supercapacitor (ASC) is also assembled using poly(vinyl alcohol)/KOH, u-hl-MSC, and activated carbon/Super P as the electrolyte, cathode, and anode materials, respectively. This solid capacitor exhibits one of the highest areal capacitance of 1.35 F cm-2 and an energy density of 270 mW h cm-2 with a high power density of 0.6 W cm-2 among all the MOF- or sulfide-based ASCs.

Original languageEnglish
Pages (from-to)3773-3785
Number of pages13
JournalACS Sustainable Chemistry and Engineering
Volume8
Issue number9
DOIs
Publication statusPublished - 2020 Mar 9

Bibliographical note

Publisher Copyright:
Copyright © 2020 American Chemical Society.

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Environmental Chemistry
  • General Chemical Engineering
  • Renewable Energy, Sustainability and the Environment

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