Preparation and electrochemical properties of manganese oxide/N-doped carbon composites
To obtain an electrode material with high power density,high specific capacitance,and long cycle life,manganese dioxide/polyaniline(MnO2@PANI)nanocomposite materials were synthesized through the gas-liquid interface reaction between aniline(An)gas and potassium permanganate(KMnO4)aqueous solution.The MnO2@PANI nanocomposite materials were then placed in a tubular furnace and annealed at a constant temperature of 700℃under argon protection for 2 hours,resulting in the formation of manganese oxide/carbon(MnOx@C)composite materials.The composition,structure,and microstructure of the products were analyzed using scanning electron microscope,X-ray diffractometer,specific surface area and pore size analyzer,Fourier transform infrared spectrometer,and X-ray photoelectron spectrometer.The electrochemical test results show that MnOx@C has a higher voltage range(-1-1 V),excellent specific capacitance(215 F/g,1 A/g),ideal rate performance(the specific capacitance retention is 56%when the current density increases from 1 A/g to 10 A/g),and a longer cycle life(after 5 000 charge-discharge cycles,the specific capacitance retention remains 96.2%at a current density of 5 A/g).Thus the introduction of carbon materials can effectively improve the specific capacitance,rate performance,and cycling stability of manganese-based supercapacitor electrode materials.
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