通过化学气相沉积(CVD)法在泡沫镍基底直接生长多壁碳纳米管(MWNTs),采用水热法在MWNT上原位沉积MnO2,合成MnO2-MWNT-Ni foam超级电容器复合电极.相比MnO2-Ni foam电极,由于优越的结构和导电性能,MnO2-MWNT-Ni foam复合电极有更好的电化学反应活性,电荷传递电阻从0.411Ω下降至0.054Ω.三电极系统下,MnO2-MWNT-Ni foam复合结构的比电容为771.5 F/g,1000个循环后的保持率为102.7%,展现了电容特性和循环稳定性.MnO2-MWNT-Ni foam复合电极成本低、比电容大、功率密度和能量密度高、循环寿命长,在超级电容器和其他电池的制备中具有优势.%In this work,multi-walled carbon nanotubes(MWNTs)are grown directly on nickel foam substrates with-out extra catalyst deposition by chemical vapor deposition(CVD)technique,followed by in situ deposition of manganese dioxide from the facile hydrothermal method to prepare the MnO2-MWNT-Ni foam electrode for supercapacitor applica-tion. Due to superior structural and electronic conductivity properties,the MnO2-MWNT-Ni foam electrode greatly im-proved the electrochemical reaction properties comparing with MnO2-Ni Foam electrode,and the charge transfer resis-tance dropped from 0.411 Ωto 0.054 Ω. In the three-electrode system,the MnO2-MWNT-Ni foam electrode presented a high specific capacitance of 771.5 F/g with capacitance retention of 102.7%after 1000 cycles,demonstrated excellent ca-pacitance performance and long-term stability. The MnO2-MWNT-Ni foam composite exhibits superior properties of low-cost,high specific capacitance,high energy density&power density,and long-term cyclic stability,which is promising for supercapacitor and other battery applications.
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