Rational design of 2D Co-ZIF-L via optimizing the linker: Metal ions molar ratio for high performance asymmetric supercapacitors

Author's Department

Energy Materials Laboratory

Fifth Author's Department

Energy Materials Laboratory

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https://doi.org/10.1016/j.est.2024.112448

All Authors

Rokaya S. Draz, Aya M. Mohamed, Heba M. El Sharkawy, Ali H. Gemeay, Nageh K. Allam

Document Type

Research Article

Publication Title

Journal of Energy Storage

Publication Date

7-30-2024

doi

10.1016/j.est.2024.112448

Abstract

Designing advanced and novel metal-organic frameworks (MOFs)-based supercapacitor electrode materials requires a comprehensive understanding of the crystal transformation in polymorph MOFs. This study demonstrates the fabrication of a plethora of cobalt ZIFs (Z8, Z16, and Z32) directly on Ni foam by optimizing the organic linker (2-MIM): metal ion ratio. The successful fabrication of the ZIF structures was confirmed via SEM, EDS, XRD, FTIR, and BET techniques, revealing the formation of ZIF-L and ZIF-67 phases. Benefiting from the excellent electrochemical features of ZIF-L, the material was tested as supercapacitor electrode material. The material with the smallest percentage of 2-MIM organic linker (Z8) showed a specific capacitance of 362.83 F g−1 at 1 A g−1. Furthermore, the optimally adjusted negative electrode (V2O5@MnO2) was coupled with the Z8 positive electrode to construct Z8//MV asymmetric device. The assembled device displayed a high specific energy (Es) of 52.91 Wh kg−1 with a specific power (Ps) of 800 W kg−1, which is higher than that reported for MOFs-based devices. This device exhibited an excellent columbic efficiency over 10,000 galvanic charging-discharging cycles. It also showed a good capacitance retention of about 78.22 % over 10,000 cycles.

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Article. Record derived from SCOPUS.

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