Weak intermolecular interactions in covalent organic framework-carbon nanofiber based crystalline, yet flexible devices

Mohammed, A.K., Vijayakumar, V., Halder, A., Ghosh, M., Addicoat, M. ORCID: 0000-0002-5406-7927, Bansode, U.P., Kurungot, S. and Banerjee, R., 2019. Weak intermolecular interactions in covalent organic framework-carbon nanofiber based crystalline, yet flexible devices. ACS Applied Materials & Interfaces. ISSN 1944-8244

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Abstract

The redox-active and porous structural backbone of covalent organic frameworks (COFs) can facilitate high-performance electrochemical energy storage devices. However, the utilities of such 2D-materials as supercapacitor electrodes in advanced self power-pack systems have been obstructed due to the poor electrical conductivity and subsequent indigent performance. Herein, we report an effective strategy to enhance the electrical conductivity of COF thin sheets through the in situ solid-state inclusion of carbon nanofiber (CNF) into the COF precursor matrix. The obtained COF-CNF hybrids possess a significant intermolecular π•••π interaction between COF and the graphene layers of the CNF. As a result, these COF-CNF hybrids (DqTp-CNF and DqDaTp-CNF) exhibit good electrical conductivity (0.25×10-3 Scm-1), as well as high performance in electrochemical energy storage (DqTp-CNF: 464 mFcm-2at 0.25 mAcm-2). Also, the fabricated, mechanically strong quasi-solid-state supercapacitor (DqDaTp-CNF SC) delivered an ultra-high device capacitance of 167 mFcm-2 at 0.5 mAcm-2. Furthermore, we integrated a monolithic photovoltaic self-charging power-pack by assembling DqDaTp-CNF SC with a perovskite solar cell. The fabricated self power-pack delivered excellent performance in the areal capacitance (42 mFcm-2) at 0.25 mAcm-2 after photo charging for 300 seconds.

Item Type: Journal article
Publication Title: ACS Applied Materials & Interfaces
Creators: Mohammed, A.K., Vijayakumar, V., Halder, A., Ghosh, M., Addicoat, M., Bansode, U.P., Kurungot, S. and Banerjee, R.
Publisher: American Chemical Society
Date: 6 August 2019
ISSN: 1944-8244
Identifiers:
NumberType
10.1021/acsami.9b08625DOI
Divisions: Schools > School of Science and Technology
Depositing User: Jonathan Gallacher
Date Added: 16 Aug 2019 09:05
Last Modified: 16 Aug 2019 09:18
URI: http://irep.ntu.ac.uk/id/eprint/37352

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