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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Characterization of modified SiC@SiO2 nanocables/MnO2 and their potential application as hybrid electrodes for supercapacitors
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Characterization of modified SiC@SiO2 nanocables/MnO2 and their potential application as hybrid electrodes for supercapacitors

机译：改性SiC @ SiO2纳米电缆/ MnO2的表征及其作为超级电容器混合电极的潜在应用

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摘要

In this research, we demonstrate a simple route for preparing SiC@SiO2 core-shell nanocables and furthermore obtain SiC@SiO2 nanocables/MnO2 as hybrid electrodes for supercapacitors using various modified methods. The modified procedure consists of mild modifications using sodium hydroxide as well as UV light irradiation and deposition of MnO2. The morphology and microstructural characteristics of the composites are investigated using XRD, XPS, FE-SEM with EDS and TEM. The results indicate that the surfaces of modified SiC@SiO2 nanocables are uniformly coated with a MnO2 thin layer. The electrochemical behaviors of the hybrid electrodes are systematically measured in a three-electrode system using cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy. The resultant electrode presents a superb charge storage characteristic with a large specific capacitance of 276.3 F g(-1) at the current density of 0.2 A g(-1). Moreover, the hybrid electrode also displays a long cycle life with a good capacitance retention (similar to 92.0%) after 1000 CV cycles, exhibiting a promising potential for supercapacitors.
机译：在这项研究中，我们演示了一种制备SiC @ SiO2核壳纳米电缆的简单方法，并使用各种改进方法获得了SiC @ SiO2纳米电缆/ MnO2作为超级电容器的混合电极。修改后的程序包括使用氢氧化钠进行温和的修改以及紫外线照射和MnO2沉积。利用XRD，XPS，FE-SEM，EDS和TEM研究了复合材料的形貌和微观结构特征。结果表明，改性的SiC @ SiO2纳米电缆的表面均匀地覆盖有MnO2薄层。混合电极的电化学行为在三电极系统中使用循环伏安法，恒电流充/放电和电化学阻抗谱进行了系统测量。所得电极在电流密度为0.2 A g（-1）时具有276.3 F g（-1）的大比电容，具有极好的电荷存储特性。此外，混合电极在1000个CV循环后还具有较长的循环寿命和良好的电容保持率（约92.0％），对超级电容器具有广阔的发展前景。

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