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Insights Into the Electric Double-Layer Capacitance of the Two-Dimensional Electrically Conductive Metal-Organic Framework Cu3(HHTP)2

preprint
revised on 23.04.2021, 10:31 and posted on 23.04.2021, 12:23 by Jamie W. Gittins, Chloe J. Balhatchet, Yuan Chen, Cheng Liu, David G. Madden, Sylvia Britto, Matthias Golomb, Aron Walsh, David Fairen-Jimenez, Sian Dutton, Alexander C. Forse
Two-dimensional electrically conductive metal-organic frameworks (MOFs) have emerged as promising model electrodes for use in electric double-layer capacitors (EDLC). Here, we demonstrate the high capacitive performance of the framework Cu3(HHTP)2 (HHTP = 2,3,6,7,10,11-hexahydroxytriphenylene) with an organic electrolyte and compare its behaviour with the previously reported analogue, Ni3(HITP)2 (HITP = 2,3,6,7,10,11-hexaiminotriphenylene). At low current densities of 0.04 – 0.05 A g−1, Cu3(HHTP)2 electrodes exhibit a specific capacitance of 110 – 114 F g−1 and show modest capacitance retentions (66 %) at current densities up to 2 A g−1 , mirroring the performance of Ni3(HITP)2 and suggesting that capacitive performance is largely independent of the identity of the metal node and organic linker molecule. However, we find a limited cell voltage window of 1.3 V and only moderate capacitance retention (86 %) over 30,000 cycles at a moderate current density of 1 A g−1, both significantly lower than state-of-the-art porous carbons. These important insights will aid the design of future conductive MOFs with improved performance in EDLCs.

Funding

UKRI Future Leaders Fellowship (MR/T043024/1)

Faraday Undergraduate Summer Experience (FIRG017)

BP Next Generation Fellowship

Design of NanoMOFs Capsules for Drug Delivery and Bioimaging.

European Research Council

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Development and commercialisation of a flexible manufacturing process to produce monolithic metal-organic framework (MOF) materials.

Innovate UK

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Isaac Newton Trust (G101121)

Royal Society University Research Fellowship (UF100278)

The Materials and Molecular Modelling Hub

Engineering and Physical Sciences Research Council

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Tier 2 Hub in Materials and Molecular Modelling

Engineering and Physical Sciences Research Council

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Royal Society (PhD Funding)

School of the Physical Sciences, Cambridge (Oppenheimer Studentship)

Winton Programme for the Physics of Sustainability

History

Email Address of Submitting Author

jwg37@cam.ac.uk

Institution

University of Cambridge, Yusuf Hamied Department of Chemistry

Country

United Kingdom

ORCID For Submitting Author

0000-0002-9106-8910

Declaration of Conflict of Interest

No conflict of interest.

Version Notes

Additional computational data and editing of the text.

Exports