In order to attain new functional nanomaterials with good magnetic property,multi-walled carbon nanotubes/hematite (MWNTs/α-Fe2O3)composites were synthesized using the co-deposition method.MWNTs/α-Fe2O3 composites were characterized by X-ray diffractometry(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),Raman spectroscopy and vibrating sample magnetometry(VSM).The experimental results show that the structure and magnetic properties of the MWNTs/α-Fe2O3 composites are related to the heat treatment temperature.MWNTs are modified byα-Fe2O3 nano-particles andα-Fe2O3 nanorods with a diameter of 10-50 nm after being treated at 450℃.When the heat treatment temperature exceeds 600 ℃,MWNTs are only modified by Fe3O4 particles.Furthermore,the MWNTs composites treated at 450 ℃and 600℃have good magnetic behaviour.
A high-performance porous carbon material for supercapacitor electrodes was prepared by using a polymer blend method.Phenol-formaldehyde resin and gelatin were used as carbon precursor polymer and pore former polymer,respectively.The blends were carbonized at 800 °C in nitrogen.SEM,BET measurement and BJH method reveal that the obtained carbon possesses a mesoporous characteristic,with the average pore size between 3.0 nm and 5.0 nm.The electrochemical properties of supercapacitor using these carbons as electrode material were investigated by cyclic voltammetry and constant current charge-discharge.The results indicate that the composition of blended polymers has a strong effect on the specific capacitance.When the mass ratio of PF to gelatin is kept at 1:1,the largest surface area of 222 m2/g is obtained,and the specific capacitance reaches 161 F/g.
