Electrodeposition ZnO/BDD film as a supercapacitor electrode

In this work, ZnO microstructure was deposited on boron doped diamond (BDD) films by electrodeposition, and ZnO@BDD composite structure with spiny microrods was applied as the electrode in supercapacitors. The ZnO@BDD electrode shows excellent performance with high reversible capacity (2200 μF cm−2 at 5 μA cm−1), enhanced long-term cycling with capacity retention rate of 94.181 % after 20,000 cycles. When assembled as a symmetrical device, the full supercapacitor exhibits superior electrochemical performance (energy density of 0.16 Wh kg−1, power density of 0.34 kW kg−1 at 20 mA g−1, capacity retention rate of 93.132 % after 25,000 cycles). This work would provide a new insight into the rational design electrode materials with high capacity and stability, which is promising for the development of supercapacitors.