Electrochemical measurements
The electrochemical measurements of the fabricated MXene/AAC //activated carbon asymmetric supercapacitor were implemented in 7 M KOH aqueous electrolyte in a three-electrode cell at room temperature. The power density (P ) and energy density (E ) of the asymmetric supercapacitors were calculated according to the following equation10, 11:Cm = (I△t )/ (M△V ) (3)E = (Cm△V 2)/ 2 (4)
P = E/△t (5) Where Cm is the specific capacitance of MXene/AAC //activated carbon asymmetric supercapacitor (F g-1) and M is the total mass of active materials on both electrodes,I is the discharge current (A), △t is the discharge time (s), △V is the potential window during the discharge process except the ohmic drop (V). P is the power density and E is the energy density of the asymmetric supercapacitors.