Beschreibung:
High-performance supercapacitors are considered to be a promising mobile energy storage system due to their high specific capacitance, nevertheless their cycling performance still remains unsatisfied for practical applications. In this work, a novel NiC2O4 based composite by inducing reduced graphene oxide (rGO) and nickel foam (NF) has been constructed, which exhibits significantly improved electrochemical performance. The NiC2O4/rGO/NF (NGN) composite possesses a superior capacitance of 2440 F g-1 and an excellent cycling stability which the specific capacitance is 91.32% of the initial specific capacitance even after 30000 times. The assembled asymmetric supercapacitors(ASC) using NGN as anode and activated carbon (AC) as cathode exhibits a high energy density of 54.75 W h kg-1 at a power density of 1800.05 W kg-1, and a remarkable cycling stability ( 72.07% capacitance is retained after 10000 times). Our work provides a new approach to design electrodes with ultrahigh cycling stability