LAUSR

Abstract In this study, a novel ternary nanocomposite, graphene-cerium oxide/porous polyaniline (rGO-CeO 2 /porous PANI), was synthesized via in situ polymerization and electrochemical reduction methods. A series of characterization such as SEM, XRD, and FTIR for the as-prepared composites proved that the ternary nanocomposite with well-connected nanosheets and porous structure has been successfully synthesized. The electrochemical performance testing illustrated that the electrochemical capacitance of rGO-CeO 2 /porous PANI nanocomposite could reach 454.8 F g −1 at 1.0 A g −1 when the mass ratio of CeO 2 and porous PANI was 1:4. And the specific capacitance retained 70.23% after 10000 cycles at a current density of 5.0 A g −1 in 1.0 mol L −1  H 2 SO 4 electrolyte. In comparison to the other nanomaterials, the excellent electrochemical performance of rGO-CeO 2 /porous PANI nanocomposite is attributed to good electrical conductivity and large specific surface area brought from graphene and porous PANI, energy density and better cycle life derived from CeO 2 , and synergetic contribution among the three components. Thus, the rGO-CeO 2 /porous PANI nanocomposite is a promising electrode material for supercapacitor.