添加致孔剂制备树脂基活性炭及电容性能研究  

Study on the performance of activated carbon prepared by carbonization polymer blends made of PF with PVB and PEG for EDLC

作　　者：苏芳[1] 孟庆函[1] 宋怀河[1] 

机构地区：[1]北京化工大学化工资源有效利用国家重点实验室,北京100029

出　　处：《功能材料》2007年第1期97-100,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50502004);中国博士后科学基金资助项目(2004036200)

摘　　要：以碱性条件下合成的热固性酚醛树脂(PF)为原料,聚乙烯醇缩丁醛(PVB)和聚乙烯二醇(PEG)为致孔剂,采用聚合物共混炭化活化法制备双电层电容器用活性炭材料。通过热重(TG)分析探讨了PF,PF与PVB、PEG的共混物在炭化过程中的热解行为。考察了活化温度和活化时间对所得活性炭的收率、BET比表面积、孔径分布和比电容的影响,并进一步探讨了以这种活性炭材料作电极的双电层电容器的电容性能。结果表明,随着活化温度的升高,活化温度对活性炭收率的影响更为显著,所得活性炭的收率下降。聚合物PEG较PVB更适合作为成孔剂来控制活性炭的中孔孔径分布。酚醛树脂基活性炭电极比电容在850℃活化1h为79.2F/g,而聚乙烯二醇/酚醛、聚乙烯醇缩丁醛/酚醛混合树脂基活性炭电极比电容则分别高达130.5和145.6F/g。The polymer blend technique was proposed as a method for designing pyrolytic carbon materials used as electrodes in electric double-layer capacitance （EDLC）. Phenol-formaldehyde （PF） resin and polyvinyl butyral （PVB）, polyethylene glycol （PEG） were used as carbon precursor polymer and thermally decomposable polymer, which were with and without carbon residue after heating under an inert atmosphere, respectively. The pyrolytic behaviors of PF resin and PF/PVB, PF/PEG blends in course of carbonization were discussed by thermogravimetric analysis （TG）. The influences of activation temperature and time on the yield,BET specific surface area, pore size distribution and specific capacitance of activated carbon have been studied. And charge-discharge performance of EDLC used resultant activated carbon as electrode material has also been researched. With the increase of activation temperature,the yield of activated carbon decreased rapidly. Moreover,PF/PEG had great effect than PF/PVB on the performance of mesopore size distribution of activated carbon. The specific capacitances of the PF-PVB and PF-PEG electrodes were 145.6 and 130.5F/g, respectively, while PF resin based activated carbon was only 79. 2F/g.

关 键 词：酚醛树脂 聚合物共混 活性炭 双电层电容器 

分 类 号：TQ165[化学工程—高温制品工业]