Magnetic and electrocatalytic properties of multi-walled carbon nanotube/Fe ₃O ₄ composites

Multi-walled carbon nanotube (MWCNT)/Fe ₃O ₄ composites were prepared via a chemical synthesis-hydrothermal treatment method. The microstructure, magnetic and electrocatalytic properties of MWCNT/Fe ₃O ₄ were investigated using transmission electron microscope (TEM), X-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR), vibrating sample magnetometer (VSM) and cyclic voltammograms method. The results indicate that the surfaces of MWCNTs are enwrapped with magnetic Fe ₃O ₄ nanoparticles, and the as-prepared MWCNT/Fe ₃O ₄ composites (62.5% Fe ₃O ₄) with saturation magnetization (M _s) of 35.89 A·m ²/kg and coercive force (H _c) of 0.19 A/m have good paramagnetism at room temperature. The glass-carbon (GC) electrode modified with MWCNT/Fe ₃O ₄ has good electrocatalytic response towards H ₂O ₂, and the redox overpotential increases and the oxidation peak current enhances.