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Metal–organic framework cathodes usually exhibit low capacity and poor electrochemical performance for Li‐ion storage owing to intrinsic low conductivity and inferior redox activity. Now a redox‐active 2D copper–benzoquinoid (Cu‐THQ) MOF has been synthesized by a simple solvothermal method. The abundant porosity and intrinsic redox character endow the 2D Cu‐THQ MOF with promising electrochemical activity. Superior performance is achieved as a Li‐ion battery cathode with a high reversible capacity (387 mA h g−1), large specific energy density (775 Wh kg−1), and good cycling stability. The reaction mechanism is unveiled by comprehensive spectroscopic techniques: a three‐electron redox reaction per coordination unit and one‐electron redox reaction per copper ion mechanism is demonstrated. This elucidatory understanding sheds new light on future rational design of high‐performance MOF‐based cathode materials for efficient energy storage and conversion. [ABSTRACT FROM AUTHOR]

A conjugated copper(II) catecholate based metal–organic framework (namely Cu‐DBC) was prepared using a D2‐symmetric redox‐active ligand in a copper bis(dihydroxy) coordination geometry. The π‐d conjugated framework exhibits typical semiconducting behavior with a high electrical conductivity of ca. 1.0 S m−1 at room temperature. Benefiting from the good electrical conductivity and the excellent redox reversibility of both ligand and copper centers, Cu‐DBC electrode features superior capacitor performances with gravimetric capacitance up to 479 F g−1 at a discharge rate of 0.2 A g−1. Moreover, the symmetric solid‐state supercapacitor of Cu‐DBC exhibits high areal (879 mF cm−2) and volumetric (22 F cm−3) capacitances, as well as good rate capability. These metrics are superior to most reported MOF‐based supercapacitors, demonstrating promising applications in energy‐storage devices. [ABSTRACT FROM AUTHOR]

In ihrer Zuschrift auf S. 5311 berichten E. Hu, Y. Xu, L. Chen und Mitarbeiter über ein halbleitendes Kupfer-Benzochinoid-2D-MOF (Cu-THQ) mit außergewöhnlich hoher Kapazität für den Einsatz in Lithiumionenbatterien. In ihrer Zuschrift auf S. 5311 berichten E. Hu, Y. Xu, L. Chen und Mitarbeiter über ein halbleitendes Kupfer-Benzochinoid-2D-MOF (Cu-THQ) mit außergewöhnlich hoher Kapazität für den Einsatz in Lithiumionenbatterien. In ihrer Zuschrift auf S. 5292 zeigen M. Takeuchi et al., dass die elektronische Kommunikation durch den Raum zwischen diskreten kofacial orientierten Naphthalindiimid(NDI)-Einheiten in Cyclo-NDI über Änderungen der Temperatur und Lösungsmittelpolarität abgestimmt werden kann. [Extracted from the article]