摘要
以正硅酸乙酯(TEOS)为硅源,聚乙烯吡咯烷酮(PVP)为助纺剂,采用静电纺丝结合碳热还原制备出结晶度较高的β-SiC纤维,其比表面积为92.6 m^2/g,表现出双电层电容储能特征,比电容为155.7 F/g。然后,利用水热法在SiC纤维表面生长出大量直径约为15 nm的NiCo2O4纳米线,得到NiCo2O4纳米线/SiC复合纤维。测试表明,NiCo2O4纳米线/SiC复合纤维中镍和钴元素分别以Ni^2+/Ni^3+和Co^2+/Co^3+价态形式存在,由于NiCo2O4纳米线与SiC纤维的协同作用,NiCo2O4纳米线/SiC复合纤维比电容显著提高,并表现出双电层和赝电容并存的特征,比电容可达300.3 F/g,当功率密度为58.1 W/kg时,NiCo2O4纳米线/SiC复合纤维能量密度为60.1 W·h/kg。
Theβ-SiC fibers with high degree of crystallinity were obtained by electrospinning combined with carbothermal reduction method using tetraethyl orthosilicate(TEOS)as silicon source and polyvinylpyrrolidone(PVP)as spinning agent.The specific surface area of β-SiC fibers is 92.6 m^2/g,which show the electric double layer capacitance.The specific capacitance ofβ-SiC fibers is up to 155.7 F/g.A large number of NiCo2O4 nanowires with a diameter of about 15 nm were grown on the surface of SiC fibers via hydrothermal method in order to obtain NiCo2O4 nanowires/SiC composite fibers.The results show that nickel and cobalt elements are present in the form of Ni^2+/Ni^3+and Co^2+/Co^3+,respectively.The specific capacitance is significantly improved by the synergistic effect of NiCo2O4 nanowires and SiC fiber,and the NiCo2O4 nanowires/SiC composite fibers show both electric double layer and pseudo capacitance.The specific capacitance of NiCo2O4 nanowires/SiC composite fibers is up to 300.3 F/g.When the power density is 58.1 W/kg,the energy density of NiCo2O4 nanowires/SiC composite fibers is 60.1 W·h/kg.
作者
朱彬
刘盼
吕东风
崔燚
魏恒勇
陈越军
魏颖娜
卜景龙
ZHU Bin;LIU Pan;LV Dongfeng;CUI Yi;WEI Hengyong;CHEN Yuejun;WEI Yingna;BU Jinglong(Key Laboratory for Inorganic Nonmetallic Materials of Hebei Province,College of Material Science and Enginering,North China University of Science and Technology,Tangshan 063210,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2020年第7期1684-1694,共11页
Acta Materiae Compositae Sinica
基金
国家自然科学基金(51472072)
华北理工大学杰出青年基金(JQ201712)。
