Microwave synthesis of Bi₂Se₂ nanoflakes as high-performance electrode for supercapacitor

The self-supported nanoflake-shaped Bi₂Se₂ was synthesized with the convenient method of microwave reaction, and adhered to the flexible carbon fiber felt. A series of electrochemical tests indicate that capacitance of Bi₂Se₂/CF electrode can reach 877.0 C g[Formula: see text] (1 A g[Formula: see text]). Assembled by ligninbased carbon materials and Bi₂Se₂/CF electrode, the asymmetric capacitor has the energy density of 20.83 W h Kg[Formula: see text] while the power density can reach 749.9 W kg[Formula: see text]. After circulating for 2000 times under 3 A g[Formula: see text], the remaining capacitance retention reaches 81% of the initial one.