Preparation of high performance LaMnO3/graphene composites for hybrid electrode material

Abstract

Herein, as PVA (polyvinyl alcohol) mediated LaMnO3 perovskite/graphene hybrid composite was prepared by calcinations at 200ºC in inert atmosphere (argon, Ar). The SEM image clarify the porous nature of hybrid composites was governed by out-bust of tapped water and gases by thermal decomposition of metal precursors. The TEM image have manifested the uniform crystalline nature of LaMnO3 with inter layer spacing 0.39 nm. Spectral analysis was studied by FT-IR, which indicated the stretching modes of Mn-O-Mn are associated with octahedron MnO6 vibrations. Interestingly, the cyclic voltammetry (CV) curves are completely acknowledged with the pseudocapacitive nature in presence of LaMnO3 and resultant capacitance values are vividly increased by addition of graphene. The calculated highest specific capacitance value of hybrid composite and LaMnO3 are 1032 and 586 F g-1, respectively as well as excellent rate capability was observed after addition of graphene with perovskite structure.