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Issue 9, 2019
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Coordination derived stable Ni–Co MOFs for foldable all-solid-state supercapacitors with high specific energy

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Abstract

In this work, polycrystalline flower-like Ni–Co metal–organic frameworks (Ni–Co MOFs) have been fabricated by a simple hydrothermal method with further electrochemical activation. The mixed metal centers and polycrystalline nature are beneficial for the transport of electrons and ions. The Ni–Co MOF exhibits a high specific capacity of 833 C g−1 at 0.5 A g−1 and maintains 714 C g−1 at 20 A g−1. Meanwhile, a very good cycling stability is achieved after 5000 cycles. All-solid-state supercapacitors have been assembled using the Ni–Co MOF, polybenzimidazole (PBI) and activated carbon (AC). A high specific capacitance of 172.7 F g−1 at 0.5 A g−1 in a large potential window of 1.8 V has been achieved, which corresponds to a high specific energy of 77.7 W h kg−1 and 0.45 kW kg−1, respectively. Meanwhile, the devices also exhibit very good flexibility under bending and folding conditions with no obvious capacitance change due to the good mechanical properties of PBI. The influence of temperature on the performance of the all-solid-state devices has been evaluated. To avoid side reactions at high temperature, the device works better at relatively low temperature. This work suggests that the Ni–Co MOF and PBI solid polymer electrolyte based foldable all-solid-state supercapacitors are very promising for application in wearable and portable electronic devices.

Graphical abstract: Coordination derived stable Ni–Co MOFs for foldable all-solid-state supercapacitors with high specific energy

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Publication details

The article was received on 11 Dec 2018, accepted on 31 Jan 2019 and first published on 01 Feb 2019


Article type: Paper
DOI: 10.1039/C8TA11948A
Citation: J. Mater. Chem. A, 2019,7, 4998-5008

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    Coordination derived stable Ni–Co MOFs for foldable all-solid-state supercapacitors with high specific energy

    C. Ye, Q. Qin, J. Liu, W. Mao, J. Yan, Y. Wang, J. Cui, Q. Zhang, L. Yang and Y. Wu, J. Mater. Chem. A, 2019, 7, 4998
    DOI: 10.1039/C8TA11948A

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