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首页> 外文期刊>International Journal of Electrochemistry >Preparation and Capacitive Behavior of Dandelion-Likeγ-MnO2Nanofibre/Activated Carbon Microbeads Composite for the Application of Supercapacitor
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Preparation and Capacitive Behavior of Dandelion-Likeγ-MnO2Nanofibre/Activated Carbon Microbeads Composite for the Application of Supercapacitor

机译：超级电容器用蒲公英样γ-MnO2纳米纤维/活性炭微珠复合材料的制备及电容性能

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摘要

Dandelion-likeγ-manganese dioxide (γ-MnO2) nanofibre/activated carbon microbeads (ACMBs) composite is prepared by an in situ coating technique. The structure and morphology of the composite are characterized by scanning electron microscopy and X-ray diffraction. The results show thatγ-MnO2nanofibre is uniformly encapsulated on the surface of ACMB, and the composite finally becomes a dandelion-like microbead. Cyclic voltammetry, galvanostatic current charge/discharge, and cycle life measurements are used to evaluate the electrochemical behaviors of the composite. Since the composite is able to undergo pseudofaradic charge transfer reactions and hereto contributes together with the double-layer effect to the total capacitance of the material, the specific capacitance of the composite is as high as 375.9 F g−1at a scan rate of 1 mV s−1, which is significantly higher than the pure ACMB. Besides, the capacitance retention of the supercapacitor using the composite as electrode-active material keeps still 93% after 1000 cycles.
机译：通过原位涂覆技术制备了蒲公英样γ-二氧化锰（γ-MnO2）纳米纤维/活性炭微珠（ACMBs）复合材料。复合材料的结构和形态通过扫描电子显微镜和X射线衍射表征。结果表明，γ-MnO2纳米纤维均匀地包裹在ACMB表面，最终成为蒲公英样微珠。循环伏安法，恒电流充电/放电和循环寿命测量用于评估复合材料的电化学行为。由于复合材料能够进行伪法拉第电荷转移反应，并因此与双层效应一起对材料的总电容作出贡献，因此在1 mV的扫描速率下，复合材料的比电容高达375.9 F g-1 s-1，明显高于纯ACMB。此外，使用复合材料作为电极活性材料的超级电容器的电容保持率在1000次循环后仍保持93％。

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