| 초록 |
In recent years, supercapacitors (SCs), an electrochemical energy storage device, have emerged as an alternative to solve excessive energy consumption and depletion of fossil fuels. Although SCs possess excellent cycling stability, high power density and specific capacitance, the performance of SCs has been restricted for their low energy density. The characteristics of SCs are dependent on their electrode materials, configurations and morphologies. In the case of electrode materials, Binary transition metal sulfides (BTMSs) such as CuCo2S4 have several key advantages; rich redox reactions, the synergistic effects by interaction between diverse metal compound, better specific capacitance and electrical conductivity than single transition metal oxides. In particular, the ball-in-ball structure of the electrode material can decide diffusion/transport paths of electrons, the specific surface area and the active sites for electrochemical reactions. Herein, we successfully synthesized the CuCo2S4 novel ball-in-ball multi-shell nanostructures via uniform CuCo-glycerate nanospheres as precursor for SCs. The structural and chemical compositions of CuCo-glycerate and CuCo2S4 were confirmed through SEM, TEM, XRD and FT-IR. In addition, their electrochemical performances were investigated by CV and galvanostatic charge/discharge measurements. |
