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Development of Vanadium-Coated Carbon Microspheres: Electrochemical Behavior as Electrodes for Supercapacitors

机译：钒包覆的碳微球的发展：电化学行为作为超级电容器的电极

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Vanadium-coated carbon-xerogel microspheres are successfully prepared by a specific designed sol-gel method, and their supercapacitor behavior is tested in a two-electrode system. Nitrogen adsorption shows that these composite materials present a well-developed micro- and mesoporous texture, which depends on the vanadium content in the final composite. A high dispersion of vanadium oxide on the carbon microsphere surface is reached, being the vanadium particle size around 4.5 nm. Moreover, low vanadium oxidation states are stabilized by the carbon matrix in the composites. The complete electrochemical characterization of the composites is carried out using cyclic voltammetry, chronopotentiometry, cycling charge-discharge, and impedance spectroscopy. The results show that these composites present high capacitance as 224 F g(-1), with a high capacitance retention which is explained on the basis of the presence of vanadium oxide, texture, and chemistry surface.
机译：钒包覆的碳干凝胶微球已通过特殊设计的溶胶-凝胶法成功制备，其超级电容器性能在两电极系统中进行了测试。氮吸附表明，这些复合材料具有良好的微孔和中孔结构，这取决于最终复合物中的钒含量。钒氧化物在碳微球表面上的分散度很高，钒的粒径约为4.5 nm。此外，低钒的氧化态通过复合材料中的碳基质得以稳定。使用循环伏安法，计时电位法，循环充放电和阻抗谱对复合材料进行完整的电化学表征。结果表明，这些复合材料具有224 F g（-1）的高电容，并具有较高的电容保持率，这是基于存在氧化钒，织构和化学表面的原因而解释的。

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