摘要
以红薯为原料分别采用物理活化(CO2活化)和化学活化(KOH活化)法制备活性炭。研究了不同活化温度和时间所得活性炭的比表面积和孔结构特征,并结合扫描电子显微镜、X射线衍射仪、比表面积分析仪等对其进行测试和表征。结果表明,KOH活化法在碳碱比为1∶3、活化温度为800℃、活化时间为5h时比表面积最高,达到1590m2/g,介孔率为20.3%;CO2活化法在800℃、活化2h时比表面积较高,为1054m2/g,介孔率可达62.0%。将该两组活性炭用作超级电容器电极材料时,以6M KOH作电解质表现出了典型的双电层电容器的特征,在5A/g的电流密度下,两者的比电容量分别为143F/g和187F/g。
Activated carbon materials were prepared through physical activation（CO2activation）and chemical activation（KOH activation）of sweet potato starch,respectively.The effects of the CO2/KOH activation temperature and time on the porous structures of activated carbon obtained were investigated by means of scanning electron microscopy,X-ray diffraction,and specific surface area measurement.For the KOH activation method,the optimized carbon prepared at the carbon/alkali ratio of 1∶3,carbonization temperature of 800℃,and activated time of 5hpossesses the highest specific surface area of 1590m2/g and mesoporosity of20.3%.For the CO2 activation method,the optimal carbon obtained at the carbonization temperature of 800℃and activated time of 2hexhibits a specific surface area of 1054m2/g and mesoporosity of 62.0%.The asprepared two activated carbon exhibit the typical electrochemical double layer capacitive behavior in 6M KOH electrolyte and their specific capacitance at the current density of 5A/g are 143F/g and 187F/g,respectively.
作者
姜明珠
高天
张桂菊
JIANG Mingzhu, GAO Tian, ZHANG Guiju(College of Physics, Optoelectronics and Energy of Soochow University, Suzhou 215006, Chin)
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2018年第2期198-201,179,共5页
Journal of Materials Science and Engineering
基金
国家自然科学基金资助项目(91023009
61108024)
关键词
KOH活化
CO2活化
红薯淀粉
活性炭
KOH activation
CO2 activation
sweet potato starch
activated carbon
