▎ 摘　　要

In this study, the electrochemical properties of graphene nanosheet (GNS) electrodes are evaluated in depth by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS) techniques in [Et4N]BF4/acetonitrile electrolyte, [BPy]BF4/acetonitrile electrolyte, [BMIM]BF4/acetonitrile electrolyte and [P-4,P-4,P-4,P-4] BF4/acetonitrile electrolyte, respectively. The electrochemical results exhibit that GNSs show good supercapacitive properties in these aforementioned four non-aqueous electrolytes, especially in [Et4N]BF4/acetonitrile electrolyte. It is also observed that the rate performance and the specific capacitance of GNS electrode increase in the order of [P-4,P-4,P-4,P-4]BF4/acetonitrile < [BMIM]BF4/acetonitrile approximate to [BPy]BF4/acetonitrile < [Et4N]BF4/acetonitrile in these four non-aqueous electrolytes. The reasons are attributed to the difference of the relative ionic size and the discrepancy in the functional group among these four non-aqueous electrolytes, which result in the differences of equivalent series resistance, charge transfer resistance, and rate performance. In addition, the GNS electrode shows excellent stability in these four non-aqueous electrolytes after 1500 repeating charge-discharge cycles. These results may provide valuable information to explore new electrolytes and illustrate the exciting potential for high performance supercapacitors based on GNSs.