摘要
以干燥荷叶为前驱体,经一步活化制备氮氧共掺杂层次孔炭。采用扫描电镜、透射电镜、氮气吸附仪、X射线衍射、拉曼光谱和X射线光电子能谱对层次孔炭的形貌及微观结构进行表征。结果表明:当KOH与前驱体的质量比为1,活化温度为700℃时制备的层次孔炭(AC-1-700)呈现出不规则虫孔状形貌和相互连通的炭骨架,具备高比表面积(1229m^(2)/g)、高总孔容(0.550cm^(3)/g)、适度中孔率(18.7%)和高氮氧掺杂量(3.68%N和12.35%O)。在这些特征的协同作用下,在3mol/L KOH电解液体系中AC-1-700//AC-1-700超级电容器在0.05A/g电流密度下的单电极质量比电容达到260F/g,即使在5A/g下比电容仍保持208F/g。充放电循环10000次后电容保持率高达96.6%。
N,O co-doped hierarchical porous carbons were directly prepared via one-pot KOH activation from dried lotus leaf.The morphology and microstructure of the as-obtained hierarchical porous carbons were characterized by field emission scanning electron microscopy(FE-SEM),transmission electron microscope(TEM),nitrogen adsorption-desorption isotherms,powder X-ray diffraction(XRD)patterns,Raman spectra and X-ray photoelectron spectroscopy(XPS).Porous carbon obtained at 700°C with the KOH/precursor mass ratio of 1(denoted as AC-1-700)exhibited a wormhole-like morphology with interconnected carbon frameworks.It also presented a high specific surface area(1229 m^(2)/g),high total pore volume(0.550 cm^(3)/g),moderate mesoporous porosity(18.7%),rich nitrogen(3.68%)and oxygen(12.35%)doping.Under the synergy of these features,the electrode in AC-1-700//AC-1-700 supercapacitor delivered high specific capacitance(260 F/g at 0.05 A/g),good rate performance(208 F/g at 5 A/g)and remarkable cycling stability(96.6%capacitance retention after 10000 cycles)in 3 M KOH aqueous solution.
作者
王俊冰洁
邢宝林
王亚
王泽明
卢劲璇
张传祥
Wang Junbingjie;Xing Baolin;Wang Ya;Wang Zeming;Lu Jinxuan;Zhang Chuanxiang(College of Chemistry and Chemical Engineering,Henan Polytechnic University,Jiaozuo 454000;Collaborative Innovation Center of Coal Safety Production and Clean and Efficient Utilization jointly built by the Ministry and the Province,Jiaozuo 454000;Henan Key Laboratory of Coal Green Conversion,Jiaozuo 454000)
出处
《化工新型材料》
CAS
CSCD
北大核心
2022年第12期135-141,共7页
New Chemical Materials
基金
国家自然科学基金(51974110和52074109)
河南省高校科技创新人才支持计划项目(21HASTIT008)
河南省科技攻关项目(202102210183)
国家级大学生创新创业训练计划项目(202010460063)。
关键词
荷叶
一步活化
层次孔炭
氮氧共掺杂
超级电容器
lotus leaf
one-pot activation
hierarchical porous carbons
N/O co-doped
supercapacitor
