Abstract
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.
Supplementary materials
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Supporting Information
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