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采用水热法在阳极氧化的TiO_2纳米管阵列上修饰MnO_2,制备MnO_2/TiO_2复合物电极,并组装为对称超级电容器。利用FESEM、TEM、XPS和电化学工作站对样品的表面形貌、元素价态和电化学性能进行表征。结果表明:MnO_2以纳米颗粒形态均匀分布在TiO_2纳米管阵列管口和内部,充放电电流密度在1A/g下时,比电容为429.3F/g,经5 000次循环后的电容保持率为82.4%。MnO_2/TiO_2对称超级电容器在电流密度5A/g下充放电比电容为39.9F/g,经5 000次循环后的电容保持率为91.5%;功率密度400 W/kg下,能量密度为18.98 Wh/kg。阳极氧化的TiO_2纳米管阵列既可做MnO_2的载体,基底Ti又可做集流体,减轻了超级电容器的质量,为制备超级电容器提供了一种思路。
The MnO 2 was modified on the anodized TiO 2 nanotube array by hydrothermal method, and the MnO 2 / TiO 2 composite electrode was prepared and assembled into a symmetric supercapacitor. The surface morphology, elemental valence and electrochemical properties of the samples were characterized by FESEM, TEM, XPS and electrochemical workstation. The results showed that the specific capacitance of MnO_2 was 429.3F / g when the charge-discharge current density was 1 A / g and the capacitance retention rate after 5 000 cycles was 82.4%. The charge-discharge specific capacitance of MnO_2 / TiO_2 symmetric supercapacitor at the current density of 5A / g was 39.9F / g, the retention of capacitance after 5 000 cycles was 91.5% and the energy density was 18.98 Wh at power density of 400 W / kg / kg. The anodized TiO 2 nanotube array can be used as the carrier of MnO 2, and the substrate Ti can be used as a current collector to reduce the quality of supercapacitors and provide an idea for preparing supercapacitors.