基于超级电容器用钴系化合物的制备与性能研究
发布时间：2018-07-31 11:15
【摘要】：摘要：超级电容器因为其功率密度高、充电速度快、循环寿命长,被认为下一代储能设备的佼佼者之一,已成为电动汽车、电动混合动力汽车辅助动力源的首选。而电极材料对超级电容器电容性能起着决定性的作用,因此由于具有廉价、储存量大、环保的特点和优异的电化学性能C0304成为最有应用前景的超级电容器电极材料之一。然而,在电极反应中,由于Co3O4较低的电导率和电解液进入电极微观结构的困难,界面电荷传输受到限制。因此,通过制备纳米多孔结构、水滑石结构的材料及与导电性良好的石墨烯、碳纳米管复合等方法来提高导电率离子转移的微观结构都将成为有效提高C0304电极性能的方法。因此,本论文主要研究内容如下： (1)通过溶胶凝胶法制备尖晶石结构的NiCo2O4样品,通过加入表面活性剂CTAB来改善样品的表面结构。研究表明,当CTAB量为0.025g时得到的样品结构形貌最好,为三维蜂窝网状立体结构,NiCo2O4样品上还具有孔隙结构,这些特征使得制备材料不但具有良好的导电性,而且反应活性位点大大增多,从而提高了材料的比容量和倍率性能。 (2)成功的通过快速成核-水热法合成出了Co-Al水滑石样品,且样品拥有均匀的形貌,厚度在十几个纳米,宽度为200nm的类正六边形。且Co-Al比例为2：1时得到的样品电化学性能最优异,比容量达到450F g-1在0.5A g-1的电流密度时。 (3)用乙醇-水溶液作为溶剂(V乙醇：V水=9：1),四水醋酸钻为钴原,通过水解-水热法合成Co3O4/moCNTs/rmGO复合物。通过物相,形貌分析,确认Co304粒子和moCNT已成功链接到石墨烯表面,同时确定了氧化石墨还原为石墨烯。Co3O4/moCNTs/rmGO复合物表现出优异的电化学性能(502F g-1于0.5A g-1),同时期循环稳定性能也要好于纯C0304粒子。
[Abstract]:Absrtact: because of its high power density, high charging speed and long cycle life, supercapacitor is considered as one of the best energy storage equipment in the next generation, and has become the first choice of auxiliary power source for electric vehicles and electric hybrid vehicles. Electrode materials play a decisive role in the capacitive performance of supercapacitors, so C0304 has become one of the most promising electrode materials for supercapacitors because of its low cost, large amount of storage, environmental protection and excellent electrochemical performance. However, in the electrode reaction, the interfacial charge transfer is limited due to the low conductivity of Co3O4 and the difficulty of electrolyte entering the electrode microstructure. Therefore, the preparation of nano-porous structure, hydrotalcite-structured materials and the combination of graphene with good conductivity, carbon nanotubes and other methods to improve the conductivity of ion transfer microstructure will become an effective way to improve the performance of C0304 electrode. Therefore, the main contents of this thesis are as follows: (1) Spinel NiCo2O4 samples were prepared by sol-gel method, and the surface structure of the samples was improved by adding surfactant CTAB. The results show that when the CTAB content is 0.025 g, the morphology of the sample is the best, and the pore structure is also found on the sample with three-dimensional honeycomb net structure, which makes the prepared material not only have good electrical conductivity, but also have good electrical conductivity. Moreover, the number of reactive sites increased greatly, which improved the specific capacity and performance of the materials. (2) Co-Al hydrotalcite samples were successfully synthesized by rapid nucleation and hydrothermal method, and the samples had uniform morphology. The thickness of a dozen nanometers, width of 200nm like hexagon. When the Co-Al ratio was 2:1, the electrochemical properties of the samples were the best. When the specific capacity reached 450 F g ~ (-1) and the current density was 0.5 A g ~ (-1). (3) ethanol aqueous solution was used as solvent (V ethanol: v water 9: 1), and acetic acid tetrahydrate was drilled into cobalt proto. Co3O4/moCNTs/rmGO complex was synthesized by hydrolysis-hydrothermal method. The results of phase and morphology analysis show that Co304 particles and moCNT have been successfully linked to graphene surface. At the same time, the reduction of graphite oxide to graphene. Co3O4 / moCNTsrmGO complex showed excellent electrochemical properties (502Fg-1 to 0.5Ag-1), and the cyclic stability of the composite was better than that of pure C0304 particles at the same time.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM53;O611.4
本文编号：2155411
[Abstract]:Absrtact: because of its high power density, high charging speed and long cycle life, supercapacitor is considered as one of the best energy storage equipment in the next generation, and has become the first choice of auxiliary power source for electric vehicles and electric hybrid vehicles. Electrode materials play a decisive role in the capacitive performance of supercapacitors, so C0304 has become one of the most promising electrode materials for supercapacitors because of its low cost, large amount of storage, environmental protection and excellent electrochemical performance. However, in the electrode reaction, the interfacial charge transfer is limited due to the low conductivity of Co3O4 and the difficulty of electrolyte entering the electrode microstructure. Therefore, the preparation of nano-porous structure, hydrotalcite-structured materials and the combination of graphene with good conductivity, carbon nanotubes and other methods to improve the conductivity of ion transfer microstructure will become an effective way to improve the performance of C0304 electrode. Therefore, the main contents of this thesis are as follows: (1) Spinel NiCo2O4 samples were prepared by sol-gel method, and the surface structure of the samples was improved by adding surfactant CTAB. The results show that when the CTAB content is 0.025 g, the morphology of the sample is the best, and the pore structure is also found on the sample with three-dimensional honeycomb net structure, which makes the prepared material not only have good electrical conductivity, but also have good electrical conductivity. Moreover, the number of reactive sites increased greatly, which improved the specific capacity and performance of the materials. (2) Co-Al hydrotalcite samples were successfully synthesized by rapid nucleation and hydrothermal method, and the samples had uniform morphology. The thickness of a dozen nanometers, width of 200nm like hexagon. When the Co-Al ratio was 2:1, the electrochemical properties of the samples were the best. When the specific capacity reached 450 F g ~ (-1) and the current density was 0.5 A g ~ (-1). (3) ethanol aqueous solution was used as solvent (V ethanol: v water 9: 1), and acetic acid tetrahydrate was drilled into cobalt proto. Co3O4/moCNTs/rmGO complex was synthesized by hydrolysis-hydrothermal method. The results of phase and morphology analysis show that Co304 particles and moCNT have been successfully linked to graphene surface. At the same time, the reduction of graphite oxide to graphene. Co3O4 / moCNTsrmGO complex showed excellent electrochemical properties (502Fg-1 to 0.5Ag-1), and the cyclic stability of the composite was better than that of pure C0304 particles at the same time.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM53;O611.4
【参考文献】
相关期刊论文 前1条
1 温润娟;杨占红;陈红燕;胡友旺;段吉安;;Zn-Al-La hydrotalcite-like compounds as heating stabilizer in PVC resin[J];Journal of Rare Earths;2012年09期
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