Preparation of High Performance LaMnO_3/Graphene Composites for Hybrid Electrode Material

摘要

Herein, as PVA (polyvinyl alcohol) mediated LaMnO_3 perovskite/graphene hybrid composite was prepared by calcinations at 200° C 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 LaMnO_3 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 MnO_6 vibrations. Interestingly, the cyclic voltammetry (CV) curves are completely acknowledged with the pseudocapacitive nature in presence of LaMnO_3 and resultant capacitance values are vividly increased by addition of graphene. The calculated highest specific capacitance value of hybrid composite and LaMnO_3 are 1032 and 586 F g~(-1), respectively as well as excellent rate capability was observed after addition of graphene with perovskite structure.