Synthesis and electrochemical properties of tube-like nitrogen-doped graphene/manganese oxide composite for supercapacitors

A facile and simple method to prepare tube-like nitrogen-doped graphene (NG)/manganese oxide (Mn₃O₄) composite is introduced. The transmission electron microscopy patterns show that the Mn₃O₄ nanotubes were uniformly dispersed on the surface of the NGs. The composite was further investigated by Raman spectroscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The electrochemical properties of NG/Mn₃O₄ composites were tested by cyclic voltammetry curves and galvanostatic charge-discharge curves. The results of the electrochemical measurement show the high capacitance and good long-term stability of NG/Mn₃O₄ composites.