Abstract

In this study, NiMoO4 nanorods @ ZIF-67 derived Co3O4 material supported by cellulose based carbon aerogel (CA) is successfully synthesized by two-step hydrothermal method. Benefitting from hierarchical porous structure, large specific surface and chemical composition, the NiMoO4@Co₃O₄/CA ternary composite electrode delivers an enhanced specific capacitance of 1092.1 F/g at 0.5 A/g with the good rate capability (70.7% capacitance retention at 5.0 A/g). Besides, an advanced asymmetric supercapacitors (ASCs) is assembled by using the as-prepared NiMoO4@Co₃O₄/CA ternary composite as a positive electrode and activated carbon (AC) as negative. The results suggest that the ASCs device exhibits a large capacitance of 125.4 F/g at 0.5 A/g, a highest energy density of 34.1 Wh/kg at a power density of 208.8 W/kg as well as cycling stability (84% after 2000 cycles), suggesting its great applications in energy storage. Namely, our results may provide a general approach to construct carbon aerogel and various MOF based composite materials with hierarchical porous structure for potential applications in supercapacitor.

Keywords: Supercapacitors; Carbon aerogels; NiMoO₄; ZIF-67 derived Co₃O₄; Hierarchically porous structure

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Wang, M.; Zhang, J.; Yi, X.; Liu, B.; Zhao, X.; Liu, X. Beilstein Arch. 2019, 2019126. doi:10.3762/bxiv.2019.126.v1

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