采用化学沉积和500℃热处理的方法在多孔氧化铝(AAO)模板中成功地合成了超级电容器电极材料γ-MnO2纳米管.运用XRD,SEM,TEM和N2吸附-脱附对实验制备的γ-MnO2纳米管进行了结构、形貌和比表面积分析.通过循环伏安法(CV)和恒电流充放电测试在1 mol/L Na2SO4溶液中研究了γ-MnO2电极的电化学性能.电化学实验结果表明:在电流密度100 mA/g下,γ-MnO2电极的质量比容量可达到566 F/g;充放电循环1000次后,电化学比容量仍然能够保持在90%以上.γ-MnO2纳米管具有优异的电化学性能,是一种很有前景的超级电容器电极材料.%y-MnO2 nanotubes have been successfully synthesized by chemically depositing manganese hydroxide in anodic aluminum oxide (AAO) templates and thermally annealing at 500 ℃. The synthesized nanotubes have been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and nitrogen adsorption-desorption isotherm analysis. The electrochemical capacitance behavior of the y-MnO2 nanotubes electrode was investigated by cyclic voltammetry and galvanostatic charge-discharge studies in 1 mol/L Na2SO4 solution. The electrochemical data demonstrate that the y-MnO2 nanotubes display good capacitive behavior with a high specific capacitance of 566 F/g at a current density of 100 mA/g and a good specific capacitance retention of ca. 90％ after 1000 continuous charge-discharge cycles, indicating that the γ-MnO2 nanotubes can be promising electroactive materials for supercapacitor.
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