溶剂热—热分解法制备四氧化三钴及其电容性能的研究

发布时间：2018-03-12 22:41

本文选题：Co_3O_4　切入点：纳米花　出处：《中南大学》2011年硕士论文　论文类型：学位论文

【摘要】：超级电容器,作为一种重要的储能装置,能够为现代电子仪器和电动装置提供具有高能量密度、优异的可逆性、良好的循环性能的能源。四氧化三钴的理论容量为3560 F·g-1。四氧化三钻由于其良好的电容性能和环境友好性,已成为一种主要的电容器电极材料。最近,在集流体上直接生长的纳米材料,已成为了一种非常具有吸引力的的电容器电极材料。这种直接生长的结构对电容性能的影响很大。每个纳米结构都与集流体直接接触,这保障了所有纳米结构都参与电化学反应,因此提高了活性材料的利用率,也节省了混入粘结剂(高分子)和导电剂(炭黑或乙炔黑)以制作电极的繁琐过程。相邻纳米结构的间距加速了电解液在电极内部的扩散,这有利于减小电极内部电阻和提高大电流下的电容性能。这些在集流体上直接生长的纳米材料展现出了比传统粉末材料更加优异的电容性能。本课题首次通过简易的两步法在泡沫镍上制备了新颖的C0304纳米花材料。先通过一个条件易控的溶剂热过程,再通过热分解过程,就可在泡沫镍上制备出C0304纳米花。这种纳米材料可以直接用作超级电容器电极,而不再经过复杂的电极制备过程。通过XRD、SEM和TEM等检测方法研究了产物的物相、形貌。结果表明C0304纳米花是多孔的。纳米花的孔径和纳米花之间的间距可以分别通过控制热分解和溶剂热条件加以调控。本文考察了孔径和C0304纳米花的数量对C0304材料电化学性能的影响。论文通过不同扫速下的循环伏安,不同电流密度下的恒流充放电等电化学测试方法探讨了C0304纳米花在6.0 mol·L-1 KOH溶液中的电容性能。结果表明C0304纳米花电化学性能非常优异：在电流密度0.2 A·g-1下可达1936.7 F·g-1。即使在3 A·g-1的大电流密度下,1000次充放电循环后C0304纳米花的容量仍保持78.2%。这种在泡沫镍上生长的C0304纳米花电极材料,可以大面积制备,并且具有优异的电化学性能,在电容器应用中很有前景。
[Abstract]:Super capacitor as an energy storage device, can provide high energy density for modern electronic devices and electric device, excellent reversibility and good cycle performance. The energy theory capacity of four oxidation three cobalt was 3560 F - g-1. four oxidation three drilling due to its good capacitance performance and environment friendly that has become a main capacitor electrode material. Recently, in the nano material collector direct growth, has become a very attractive capacitor electrode material. This greatly influence the structure directly on the growth of capacitance performance. Each nanostructures are in direct contact with the collector, the security all the nano structures are involved in the electrochemical reaction, so the utilization of the active material is improved, but also saves mixed binder (polymer) and conductive agent (carbon black and acetylene black) with complicated production process adjacent electrodes. The spacing between nanomaterials accelerates the diffusion of electrolyte in the electrode, which helps to reduce the internal resistance of the electrode and improve the capacitive performance under high current. These nano materials directly grown on the collector show better capacitance performance than the traditional powder materials.
For the first time through the two step simple on nickel foam prepared C0304 nano materials. The first novel flower by solvent thermal process is easy to control a condition, and then through the thermal decomposition process, can be prepared by C0304 nano flowers on nickel foam. The nanometer material can be directly used as supercapacitor electrode. Instead of through the electrode preparation process is complicated. The XRD morphology of SEM and TEM methods for detection of the product phase. The results showed that C0304 nano flowers are porous. The spacing between the aperture and the nano flower flower can be respectively controlled by nano thermal decomposition and solvent thermal conditions were investigated to control. Influence of the number of aperture and C0304 nano flowers on the electrochemical properties of C0304 materials. Through the different cyclic voltammetric velocities, different current densities, constant current charge discharge electrochemical method of C0304 nano flowers in 6 mol L-1 in KOH solution. The results show that the capacitance performance of C0304 nano flowers very excellent electrochemical performance: in the current density of 0.2 A - g-1 up to 1936.7 F - g-1. even at high current density of 3 A - g-1, C0304 - 1000 cycles C0304 nanoflower capacity still maintain this growth in global 78.2%. foam nickel flowers on the electrode material can be prepared by a large area, and has excellent electrochemical performance, the capacitor applications are promising.

【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TM53

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