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

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.


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


Email Address of Submitting Author


University of Cambridge, Yusuf Hamied Department of Chemistry


United Kingdom

ORCID For Submitting Author


Declaration of Conflict of Interest

No conflict of interest.

Version Notes

Additional computational data and editing of the text.