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Impedance investigation of activated carbon material modified by ultrasound treatment

机译:超声改性活性炭材料的阻抗研究

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The influence of ultrasonic radiation in the cavitation regime on the properties of wood activated carbon has been studied. The optimum mode of ultrasound treatment that leads to increase of specific capacity of supercapacitors from 52 F/g to 151 F/g was determined. It was shown that ultrasound treatment does not cause significant changes in porous structure of activated carbon, but reduces the amount of surface groups. The impedance dependencies for the supercapacitors made both of the original and modified carbon have been analyzed. The equivalent electrical circuits modelling the impedance hodographs have been constructed. De Levie impedance model, modified by series connection of parallel RscCsc-Iinks, was used. It has been shown that ultrasonic radiation changes the properties of the surface and the Fermi level position shifts to the energy region with high states density of delocalised electrons.
机译:研究了空化状态下超声辐射对木材活性炭性能的影响。确定了导致超级电容器比容量从52 F / g增加到151 F / g的超声处理的最佳模式。结果表明,超声处理不会引起活性炭多孔结构的明显变化,但会减少表面基团的数量。分析了由原始碳和改性碳制成的超级电容器的阻抗依赖性。已经构建了等效的电路来模拟阻抗全息图。使用通过并联RscCsc-Iinks的串联连接修改的De Levie阻抗模型。已经表明,超声辐射改变了表面的特性,并且费米能级位置移动到离域电子具有高态密度的能量区域。

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