One-pot synthesis of graphene/SnO2/PEDOT ternary electrode material for supercapacitors

A ternary electrode material, based on graphene, tin oxide (SnO2) and poly(3,4-ethylene-dioxythiophene) (PEDOT) has been obtained via one-pot synthesis for supercapacitors. The resulting composite graphene/SnO2/PEDOT (GE/SnO2/PEDOT) shows excellent electrochemical stability in acidic electrolyte, and good electrochemical performance with enhanced capacitance and energy density in both acidic and neutral electrolytes, compared to their binary composites. A maximum specific capacitance of 184 Fg(-1) in 1 M H2SO4 and 180 Fg(-1) in 1 M Na2SO4 respectively was obtained. Its energy density reaches 22 Wh Kg(-1) at a power density of 238.3 W kg(-1), and 17.1 Wh kg(-1) at a high power density of 5803.3 W kg(-1) in H2SO4. While in Na2SO4, the energy density achieves 23.4 Wh Kg(-1) at a power density of 253 W kg(-1) and 10.2 Wh Kg(-1) at power density of 3684W kg(-1), respectively. The specific capacitance can still be retained about 100% and 70% at 1 A g(-1) after 5000 cycles in 1 M H2SO4 and Na2SO4, respectively. The improved electrochemical property of GE/SnO2/PEDOT as electrode materials is mainly ascribed to the well-designed ternary nanostructure of the functional components with enhanced synergistic effects. (C) 2013 Elsevier Ltd. All rights reserved.