3D nanoflower-like MoSe2 encapsulated with hierarchically anisotropic carbon architecture: a new and free-standing anode with ultra-high areal capacitance for asymmetric supercapacitors

Abstract

A novel anode material with a delicate composite structure, which is assembled by growing 3D MoSe₂ nanoflowers onto the hierarchically anisotropic carbon architecture, is designed for the first time. The structural superiority and synergistic effects from EDLC and pseudocapacitance endow the free-standing anode with an ultra-high areal capacitance of 1043 mF cm⁻² at 1 mA cm⁻² and high cycling stability. Moreover, an asymmetric supercapacitor device consisting of this anode and a common MnO₂-based cathode yields a quite large energy density of 147 μW h cm⁻² at the power density of 2 mW cm⁻², which is higher than or comparable to that of some Li-ion batteries. These results verify the huge application potential of this new anode for supercapacitors.