| NiCo2O4纳米线/SiC复合纤维制备及其电化学性能 |
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| 引用本文： | 朱彬,刘盼,吕东风,崔燚,魏恒勇,陈越军,魏颖娜,卜景龙.NiCo2O4纳米线/SiC复合纤维制备及其电化学性能[J].复合材料学报,2020,37(7):1684-1694. |
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| 作者姓名： | 朱彬 刘盼 吕东风 崔燚 魏恒勇 陈越军 魏颖娜 卜景龙 |
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| 作者单位： | 华北理工大学 材料科学与工程学院 河北省无机非金属材料重点实验室，唐山 063210 |
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| 基金项目： | 国家自然科学基金（51472072）；华北理工大学杰出青年基金（JQ201712） |
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| 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 m2/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Ni2+/Ni3+和Co2+/Co3+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。
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| 关 键 词： | NiCo2O4纳米线 SiC 复合纤维 碳热还原 水热法 电化学 |
| 收稿时间： | 2019-08-04 |
Preparation and electrochemistry properties of NiCo2O4 nanowire/SiC composite fiber |
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| Affiliation: | Key Laboratory for Inorganic Nonmetallic Materials of Hebei Province, College of Material Science and Engineering, North China University of Science and Technology, Tangshan 063210, China |
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| Abstract: | The β-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 m2/g, which show the electric double layer capacitance. The specific capacitance of β-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 Ni2+/Ni3+ and Co2+/Co3+, 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. |
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