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In situ growth CNT@MOFs core-shell structures enabling high specific supercapacitances in neutral aqueous electrolyte

Lu, Mingxia, Wang, Gang, Yang, Xiping and Hou, Bo ORCID: https://orcid.org/0000-0001-9918-8223 2022. In situ growth CNT@MOFs core-shell structures enabling high specific supercapacitances in neutral aqueous electrolyte. Nano Research 15 , pp. 6112-6120. 10.1007/s12274-022-4184-y
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Abstract

Conductive metal-organic frameworks (c-MOFs) are promising active electrode materials for electrochemical double-layer capacitors with a performance that already exceeds most carbon-based materials. However, their excellent supercapacitance is primarily based on organic or alkaline electrolytes, which largely impede their broad applications and sustainabilities. In this work, we propose a new synthesis approach for fabricating carbon nanotubes and c-MOFs (CNT@MOFs) core-shell structures, which result in high supercapacitance in neutral aqueous electrolytes. We identify that CNTs provide abundant active sites to ensure high capacitance, and Ni3(2,3,6,7,10,11-hexaiminotriphenylene (HITP))2 nanoarrays that in situ grow on the surface of CNTs bundles can significantly improve the conductivity and provide enough ion transport pathways in aqueous electrolytes. Specifically, using CNT@MOFs core-shell structures as an electrode, we obtained a high initial capacitance of 150.7 F·g−1 at 0.1 A·g−1 in 1 M Na2SO4 solution and good capacity retention of 83.5% after 10,000 cycles at 4 A·g−1. We also found that the carboxyl groups on the surface of CNTs provide better anchor sites for the in situ growth of c-MOF, which promotes the uniform growth of c-MOF shells on the CNT surface and improves aqueous electrolyte accessibility. We believe that the high supercapacitance in aqueous electrolytes reported in this work would provide a good prospect for deploying c-MOF based energy storage devices into biomedical and other healthcare electronic applications.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Springer
ISSN: 1998-0124
Date of First Compliant Deposit: 21 March 2022
Date of Acceptance: 24 January 2022
Last Modified: 05 Nov 2022 22:38
URI: https://orca.cardiff.ac.uk/id/eprint/148313

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