Role of surface chemistry on electric double layer capacitance of carbon materials
Role of surface chemistry on electric double layer capacitance of carbon materials
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DOI：
10.1016/j.carbon.2005.05.027
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发表时间：
2005-11-01
期刊：
影响因子：
10.9
通讯作者：
Linares-Solano, A
中科院分区：
文献类型：
--
作者：
Bleda-Martínez, MJ;Maciá-Agulló, JA;Linares-Solano, A
制备了大量在孔隙率、表面化学和电导率方面具有不同性质的多孔碳材料，并系统地研究了其在以H2SO 4为电解质的水介质中作为双电层电容器的性能。采用无烟煤、通用碳纤维和高性能碳纤维为原料，分别用KOH、NaOH、CO2和水蒸汽在不同条件下进行活化。其中，活性无烟煤的BET比表面积接近1500 m2/g，表现出最好的性能，达到320 F/g，使用三电极系统。对所有样品获得的结果，同意众所周知的电容和孔隙率之间的关系，并表明CO型氧基团的电容有积极的贡献。已发现比电容和这种类型的氧基团之间有很好的相关性。（C）2005 Elsevier Ltd.保留所有权利。
A large number of porous carbon materials with different properties in terms of porosity, surface chemistry and electrical conductivity, were prepared and systematically studied as electric double layer capacitors in aqueous medium with H2SO4 as electrolyte. The precursors used are an anthracite, general purpose carbon fibres and high performance carbon fibres, which were activated by KOH, NaOH, CO2 and steam at different conditions. Among all of them, an activated anthracite with a BET surface area close to 1500 m(2)/g, presents the best performance, reaching a value of 320 F/g, using a three-electrode system. The results obtained for all the samples, agree with the well-known relationship between capacitance and porosity, and show that the CO-type oxygen groups have a positive contribution to the capacitance. A very good correlation between the specific capacitance and this type of oxygen groups has been found. (C) 2005 Elsevier Ltd. All rights reserved.