Facile synthesis of reduced graphene oxide/NiMn2O4 nanorods hybrid materials for high-performance supercapacitors

•Reduced graphene oxide/Spinel NiMn2O4 nanorods hybrid materials were prepared for supercapacitors.•The hybrid materials constructed from graphene and 1-D NiMn2O4 nanorods exhibit prominent synergistic effects.•Reduced graphene oxide contributes to enhance the specific capacitance by providing a conducting support.•The hybrid materials exhibit excellent electrochemical performance and stability.

We report a mild strategy to synthesize reduced graphene oxide/spinel nickel manganese oxide (rGO/NiMn2O4) nanorods composites. The rGO/NiMn2(C2O4)3 precursors were prepared via coprecipitation method in ethanol-water system and the composites were obtained by calcining the precursors in air. The hybrid materials have been characterized by X-ray powder diffraction, Raman spectra, X-Ray photoelectron spectroscopy, high-resolution transmission electron microscopy and field emission scanning electron microscopy. Different electrochemical measurements have been used in a three electrode system to study the electrochemical performance such as cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance spectroscopy. The typical hybrid materials (30 wt% rGO) display a high specific capacitance (693.00 F g−1 at 1 A g−1) and prominent cycling stability (91.38% capacitance retention after 2000 cycles at 5 A g−1), indicating that the composites possess potential application as excellent electrode material.

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