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Metal–organic frameworks (MOFs) have been widely explored and applied in many fields. However, the poor electrical conductivity of many traditional MOFs greatly limits their application in electrochemistry, especially in energy storage. In this study, a typical cMOF (Ni-HHTP, HHTP = 2,3,6,7,10,11-hexahydroxytriphenylene) was compounded with MXene nanosheets and a series of composites, namely MXene@Ni-HHTP-x (x = 1–8), were obtained. As a result, when MXene@Ni-HHTP-2 was assembled as a positive electrode material in an asymmetric supercapacitor, it achieved a specific capacitance of 416.6 F g−1 at 0.5 A g−1, manifesting a good performance in energy storage. [ABSTRACT FROM AUTHOR]

Metal‐organic frameworks (MOFs) have been widely investigated as functional materials with excellent properties. However, most MOFs are of poor electrical conductivity, which hinders their further application in electrochemical fields. Fortunately, the emergence of intrinsically conductive MOFs (c‐MOFs) alleviates this problem. Layered double hydroxides (LDHs) possess Faraday redox reactivity, which is favorable to capacitors. In this paper, we combined c‐MOFs with LDHs and prepared a series of NiCo‐LDH@M‐HHTP(‐EtOH) (M=Ni or Co; HHTP=2,3,6,7,10,11‐hexahydroxytriphenylene) multilayer nanoarrays, and the effects of solvent on the morphology and energy storage properties of the materials were investigated. When NiCo‐LDH@Co‐HHTP‐EtOH is applied as an electrode material in supercapacitors, it exhibits a capacitance of 830 F g−1 at 1 A g−1. Furthermore, it exhibits high energy density and excellent rate performance when assembled in aqueous asymmetric supercapacitors. [ABSTRACT FROM AUTHOR]

C26H22N2O2, monoclinic, P21/c (no. 14), a = 16.4367(8) Å, b = 12.7804(6) Å, c = 19.5474(8) Å, β = 96.1700(14)°, V = 4082.5(3) Å3, Z = 8, Rgt(F) = 0.0516, wRref(F2) = 0.1195, T = 273(2) K.

C26H22N2O2, monoclinic, P21/c (no. 14), a = 16.4367(8) Å, b = 12.7804(6) Å, c = 19.5474(8) Å, β = 96.1700(14)°, V = 4082.5(3) Å3, Z = 8, Rgt(F) = 0.0516, wRref(F2) = 0.1195, T = 273(2) K. [ABSTRACT FROM AUTHOR]

C26H22N2O2, monoclinic, P21/c (no. 14), a = 16.4367(8) Å, b = 12.7804(6) Å, c = 19.5474(8) Å, β = 96.1700(14)°, V = 4082.5(3) Å3, Z = 8, Rgt(F) = 0.0516, wRref(F2) = 0.1195, T = 273(2) K. [ABSTRACT FROM AUTHOR]

Metal organic frameworks (MOFs) have been widely researched and applied in many fields. However, the poor electrical conductivity of many traditional MOFs greatly limits their application in electrochemistry, especially in energy storage. Benefited from the full charge delocalization in the atomical plane, conductive MOFs (c-MOFs) exhibit good electrochemical performance. Besides, unlike graphene, c-MOFs are provided with 1D cylindrical channels, which can facilitate the ion transport and enable high ion conductivity. Transition-metal oxides (TMOs) are promising materials with good electrochemical energy storage performance due to their excellent oxidation-reduction activity. When composited with TMOs, the c-MOFs can significantly improve the capacitance and rate performance. In this work, for the first time, we designed serial MnO 2 @Ni-HHTP (HHTP = 2,3,6,7,10,11-hexahydroxytriphenylene) nanoarrays with different lengths and explored how the lengths influence the electrochemical energy storage performance. By taking advantage of the high redox activity of MnO 2 and the excellent electron and ion conductivity in Ni-HHTP, when assembled as the positive electrode material in an aqueous asymmetric supercapacitor, the device displays high energy density, outstanding rate performance, and superior cycle stability. We believe that the results of this work would provide a good prospect for developing other c-MOF composites as a potential class of electrode materials in energy storage and conversion.