摘要
以木材液化物为原料,利用乳液法制备树脂球,经半固化、溶解、二次固化、炭化、活化制备木质基空心炭球(HCS)。通过扫描电镜、X射线衍射、拉曼光谱仪、X射线光电子能谱、比表面及孔隙度分析仪研究了半固化时间(3min、10min、20min、30min)对木质基空心炭球表面形貌、石墨化程度、表面官能团、空隙结构的影响,并探讨了HCS的电化学性能。结果表明:随着半固化时间增加,HCS壁变厚,空腔体积变小,石墨化程度先增大后减小,表面官能团C—C键先减少后增加,C—O键先增加后减少。半固化10min时,制备HCS的比表面积高达1610m^(2)/g,总孔容达到0.93cm^(3)/g,在以6mol/L KOH作为电解质的三电极体系中进行测试,发现当电流密度为0.5A/g时比电容高达139.8F/g,经3000次循环测试后,其比电容保持率为77%,显示了优异的倍率性能。
Using liquefied wood as raw material,resin spheres were prepared by emulsion method,and wood-based hollow carbon sphere(HCS)were prepared by semi-curing,dissolving,secondary curing,carbonization and activation.The effects of semi-curing time(3 min,10 min,20 min and 30 min)on the surface morphology,graphitization degree,surface functional groups and void structure of the HCS were studied by SEM,XRD,raman spectrometer,XPS and specific surface and porosity analyzer.The electrochemical properties of the HCS were discussed.The results shown that with the increase of semi-curing time,the HCS wall became thicker,the cavity volume became smaller.The graphitization degree increased firstly and then decreased,the C—C bond of surface functional groups decreased firstly and then increased,and the C—O bond increased firstly and then decreased.After 10 min of semi-curing,the specific surface area of the HCS was as high as 1610 m^(2)/g and the total pore volume was 0.93 cm^(3)/g.Tested in three-electrode system with 6 mol/L KOH as electrolyte,it was found that the specific capacitance was as high as 139.8 F/g,when the current density was 0.5 A/g,and the specific capacitance retention rate was 77% after 3000 cycles of testing,which shown excellent rate performance.
作者
杨昭昭
马晓军
吕春飞
邱良木
Yang Zhaozhao;Ma Xiaojun;Lv Chunfei;Qiu Liangmu(College of Light Industry Science and Engineering,Tianjin University of Science and Technology,Tianjin 300450)
出处
《化工新型材料》
CAS
CSCD
北大核心
2022年第9期98-103,共6页
New Chemical Materials
基金
国家自然科学基金(31870564)。
关键词
木材液化物
空心炭球
比表面积
超级电容器
wood liquefaction
hollow carbon sphere
specific surface area
supercapacitor
