High-Performance\nElectrodes for a Hybrid Supercapacitor\nDerived from a Metal–Organic Framework/Graphene Composite

Abstract

Metal–organic\nframeworks (MOFs) hold great potential in\nthe development of electrode materials for next-generation supercapacitors\nbecause of their versatile porous architectures. Here we report our\nfinding in synthesis and characterization of electrode materials derived\nfrom a pillared MOF, Ni₂(ADC)₂(DABCO) for a\nhigh-performance hybrid supercapacitor, where ADC represents 9,10-anthracene­dicarboxylate\nand DABCO corresponds to 1,4-diaza­bicyclo[2.2.2]­octane. The\npositive electrode is derived from a single MOF and graphene oxide\n(GO) composite, consisting of a highly functionalized nickel hydroxide\ncoupled with graphene, ADC, and DABCO groups. A hierarchically porous\nnitrogen-rich carbon, derived from the same MOF/GO composite, is used\nas the negative electrode. The resulting hybrid supercapacitor demonstrates\nhigh energy and power density (59 and 48 Wh kg^–1 at 0.9 and 15.5 kW kg^–1, respectively), good rate\ncapability (19% capacity loss from 1 to 20 A g^–1), and exceptional cycling stability (95% capacity retention over\n10000 cycles at 20 A g^–1). These findings imply\nthat the combination of pillared MOFs and rGO significantly enhances\nthe electrochemical performance of the resulting electrode materials.\nIn addition, this study also provides a new material preparation strategy\n(MOFs-rGO-derived materials) for synthesis of high-performance electrode\nmaterials for other energy storage devices.