摘要
以稻壳为原料,在不同活化温度下对热解焦和水热焦活化改性制备生物质活性炭,并对比研究其作为超级电容器电极材料的电容特性。采用工业分析、元素分析、扫描电镜对生物质焦的特性及形貌进行分析,采用X射线衍射、拉曼光谱、循环伏安测试、恒流充放电测试等方法对生物质活性炭的结构及电化学性能进行表征。结果表明,生物质焦活化改性产物具有优异的电容特性,且水热焦制备的生物质活性炭电容特性强于热解焦制备的生物质活性炭,800℃活化水热焦制备的生物质活性炭比表面积为3297m^2/g、电化学性能最好。此条件下,在6mol/L的KOH溶液中,电流密度0.2A/g时活性炭比电容高达353F/g,能量密度为12.26W？h/kg,且在10000次循环后比电容保持率为84.1%,表现出良好的倍率性能、充放电可逆性和循环稳定性。
The rice husk-based activated carbon as the supercapacitor electrode was synthesized by activating pyrolytic char and hydrothermal char at different activation temperatures. The properties and morphology of biochar were analyzed by industrial analysis, elemental analysis and scanning electron microscope （SEM）. The crystal structure and electrochemical performance of obtained activated carbons were also characterized by X-ray diffraction （XRD）, raman spectroscopy, cyclic voltammetry and galvanostatic charge-discharge. The results indicate that the activated carbon obtained from biochar has excellent capacitance characteristics. The activated carbon （surface area of 3297m2/g） shows the best electrochemical properties, which was prepared via the hydrothermal method at the activation temperature of 800℃. The maximum specific capacitance is 353F/g at 0.2A/g in 6mol/L KOH electrolyte, with a high energy density （12.26W.h/kg） and retaining highest capacity （84.1%） after 10000 cycles. The activated carbon derived from rice husk exhibited good rate performance, charge-discharge reversibility and cycle stability.
作者
李弯
张书平
陈涛
熊源泉
LI Wan;ZHANG Shuping;CHEN Tao;XIONG Yuanquan(School of Energy and Environment, Southeast University, Nanjing 210096, Jiangsu Province, China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2018年第11期3384-3392,共9页
Proceedings of the CSEE
基金
国家自然科学基金项目(51376047)~~
关键词
稻壳
热解
水热
活化
超级电容器
电容特性
rice husk
pyrolysis
hydrothermal
activationsupercapacitor
capacitance properties
