Surface modification of activated carbon cloth and its application for the electrode of capacitor

活性炭布的表面改性及其在电容器电极中的应用

• 批准号: 13650893
• 负责人: SOTANI Noriyuki
• 金额: $ 2.24万
• 依托单位: Kobe University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650893/
• 关键词: capacitor; activated carbon cloth; infiared diffuse refrectance spectroscopy; pore size distribution; surface area; suface functional species; TG-MASS; GC-MASSN.Sotani

In order to obtain high capacity and high power, the activated carbon cloth (denoted as ACC) as the electrode of electric double layer capacitor should have large surface area. However, the surface functional species on the surface may cause the decrease in capasity and the increase in internal resistivity. Therefore, ACC should have less surface functional species. They are usually the surface functional species with oxygens and show acidic property. They were characterized by organic analysis method, but they were very complicated. We could directly check the surface species by GC-MASS and IR diffuce reflectance spectroscopy. Lewis base materials were adsorbed on the surface species. The interaction between the surface species and the adsorbed base materials was studied. Carbonized cloth, which was a starting material, was heated in water vapor to stydy the change in surface area and the formation mechanism of pore. The surface area and pore size distribution changed dramaticallyabove 600℃. The change of surface species was studied. We found that by the treatment in water vapor two processes existed.One was the decomposition process of surface species without no surface change, and the other, the activation process with the change in surface area. The surface species were effected by adsorption of base materials according to IR result, but the capacity was not affected largely according to voltammetry. The capacity of ACC treated during activation process gradually increased. This suggests that the surface area effected largely on the capacity of ACC. We are studing the effect of activation process on the capacity.

为了获得高容量和高功率，作为双电层电容器电极的活性炭布（记为ACC）应具有较大的表面积。然而，表面的表面功能物质可能会导致容量的降低和内电阻率的增加。因此，ACC的表面功能物种应较少。它们通常是带有氧的表面功能物种并表现出酸性。有机分析方法对其进行了表征，但其过程非常复杂。我们可以通过GC-MASS和红外漫反射光谱直接检查表面物种。路易斯碱材料被吸附在表面物质上。研究了表面物质和吸附的基材之间的相互作用。将作为起始材料的碳化布在水蒸气中加热，以研究表面积的变化和孔的形成机制。 600℃以上时，比表面积和孔径分布发生显着变化。研究了表面物种的变化。我们发现通过水蒸气处理存在两个过程。一个是表面物种不发生变化的分解过程，另一个是随着表面积变化的活化过程。根据红外光谱结果，表面物种受到基材吸附的影响，但根据伏安法，容量没有受到很大影响。活化过程中处理的ACC容量逐渐增加。这表明表面积对 ACC 的容量影响很大。我们正在研究活化过程对容量的影响。

项目成果

N.Sotani: "Surface Characterization of Activated Carbon Cloth and Application to Electrical Double Layer Capacitor"3rd International conference on Inorganic materials Konstanz, Germany. 29 (2002)

N.Sotani：“活性炭布的表面表征及其在双电层电容器中的应用”第三届无机材料国际会议德国康斯坦茨。