Performance of PbO2/activated carbon hybrid supercapacitor with carbon foam substrate

PbO₂/activated carbon（AC） hybrid supercapacitor in H₂SO₄ with a carbon foam current collector is studied.The PbO₂/AC hybrid is designed with electrodeposited PbO₂ thin film as positive electrode to match with AC negative electrode.The discharge curve shows capacitive characteristics between 1.88 V and 0.65 V.The hybrid system exhibits excellent energy and power performance,with specific energy of 43.6 Wh/kg at a power density of 654.2 W/kg.The use of carbon foam current collector ensures stability of the PbO₂ electrode in H₂SO₄ environment.After 2600 deep cycles at 15 C high rate of charge/discharge,the capacity remains nearly unchanged from its initial value.