Composite material CCO/Co-Ni-Mn LDH made from sacrifice template CCO/ZIF-67 for high-performance supercapacitor

Herein, composite material cotton carbon/Co-Ni-Mn LDH (CCO/CNM) combining the cotton carbon and the metal organic framework (ZIF-67) material is successfully prepared depending on solvothermal method and calcination. Simultaneously, the impact of load upon the sacrifice template CCO/ZIF-67 and electrochemical performance of CCO/CNM are further studied, and find that the optimized CCO/Co-Ni-Mn LDH-2 (CCO/CNM-2) composite electrode exhibits excellent electrochemical properties. In the case of a current density of 1 A g(-1), the high specific capacitance of CCO/CNM-2 electrode materials can be calculated as 2995.56F g(-1). In addition, when the current density is set to 10 A g(-1), the capacitance value can still maintain 91.8% of the initial capacitance after experiencing 5000 cycles of charging and discharging. Moreover, the assembled CCO/CNM-2// activated carbon (AC) asymmetric supercapacitor shows a superior energy density of 104.98Wh kg(-1) at power density of 800 kW kg(-1), and 79.3% of the capacitance retention rate at current density of 10 A g(-1) after 10,000 charge-discharge cycles. Finally, three light emitting diodes (LEDs) are successfully lit by connecting with two CCO/CNM-2//AC asymmetric supercapacitor.

Automated summary

A composite material CCO/CNM combining cotton carbon and metal organic framework was successfully prepared and showed excellent electrochemical properties with high specific capacitance and good cycle stability. The assembled asymmetric supercapacitor exhibited superior energy density and cycling performance, successfully lighting up LED bulbs.