Ni基配位化合物的制备及其电化学行为研究

发布时间：2018-05-08 16:16

本文选题：镍基 + 配位化合物　；参考：《南昌大学》2017年硕士论文

【摘要】：超级电容器(Supercapacitor),是一种高效、实用的能量储存设备。相对于传统的储能器件,它具有更好的性能:功率密度高、充电时间短、使用寿命长、温度特性好、节约能源和绿色环保等。正因如此,它被广泛应用在各个领域中,如便携式电子产品、混合动力电动汽车、计算机,计算机内存存储系统等。如今,正因为超级电容器成为了一种高效实用的储能设备,各个发达国家都将其视为国家重点战略研究项目,尤其是研究和发展大功率的超级电容器。因此,本文利用简便的水热法,将直接长在泡沫镍上的镍基配位化合物应用在超级电容器中。主要内容如下:(1)通过水热法成功制备了三维网状纳米结构没食子酸镍镍。通过电化学分析,没食子酸镍表现出良好的电化学性能:在电流密度为9 mA cm-2(3A g-1)条件下其比电容达到3.688 F cm-2(1229.3 F g-1),同时,Ni(C_7H_4O_5)三维网状纳米结构即使在超高电流密度40 mA cm-2下,经过5000个循环之后,比电容仍然能维持在87.9%。而且,当我们将Ni(C_7H_4O_5)三维网状纳米结构作为阳极材料,活性炭作为阴极材料组装非对称超级电容器后,发现整个非对称超级电容器器件的电化学性能很好:在电流密度为0.5 A g-1时,器件的质量比电容达到了71.4F g-1,0-1.55V电压范围内,最大能量密度能达到23.8 W h kg-1,最大功率密度为388.2 W kg-1。同时,非对称器件的循环稳定性和库伦效率也表现良好。这些出色的性能都暗示Ni(C_7H_4O_5)三维网状纳米结构在超级电容器中的应用具有极大的潜力。(2)通过水热法成功制备了Ni(C_8H_6O_5,Ni-Tp)金属有机框架材料,同时,为了提高其导电性,我们利用电化学沉积的方法,在其表面沉积一层聚苯胺(PANI)。通过电化学分析,Ni-Tp/PANI表现出良好的电化学性能:在电流密度为20 mA cm-2条件下其比电容达到10.327F cm-2。同时,Ni-Tp/PANI材料在超高电流密度50 mA cm-2下,经过3000个循环之后,比电容仍然能维持在85.35%,说明了Ni-Tp/PANI的循环稳定性良好,且在整个循环过程中的库伦效率都保持在96%以上,说明了整个体系中的电化学反应的可逆性很好。(3)通过水热法成功制备了Ni(C_7H_4O_5)一维纳米阵列。同时,通过电化学分析,Ni(C_7H_4O_5)一维纳米阵列表现出良好的电化学性能:在电流密度为3mA cm-2(1A/g)条件下其比电容达到1.63F cm-2(543.3 F/g)。同时,一维的Ni(C_7H_4O_5)样品在超高电流密度21 mA cm-2(7A/g)下,经过3000个循环之后,比电容仍然能维持在85%,说明了一维的Ni(C_7H_4O_5)样品具有良好的循环稳定性,且整个循环过程中一维的Ni(C_7H_4O_5)样品的库伦效率都保持在94%以上,说明了整个体系中的电化学反应的可逆性很好。
[Abstract]:Supercapacitor supercapacitor is an efficient and practical energy storage equipment. Compared with traditional energy storage devices, it has better performance, such as high power density, short charging time, long service life, good temperature characteristics, energy saving and green environmental protection. Because of this, it is widely used in various fields, such as portable electronic products, hybrid electric vehicles, computers, computer memory storage systems and so on. Nowadays, because supercapacitors have become a kind of efficient and practical energy storage equipment, all developed countries regard them as national key strategic research projects, especially in the research and development of high-power supercapacitors. Therefore, a simple hydrothermal method is used to apply nickel based coordination compounds directly to nickel foam in supercapacitors. The main contents are as follows: (1) Nickel gallate has been successfully prepared by hydrothermal method. By electrochemical analysis, nickel gallate showed good electrochemical performance: its specific capacitance reached 3.688 F cm-2(1229.3 F g-1 at the current density of 9 Ma cm-2(3A g-1, and NiC7H4O5) at the same time, the three-dimension netted nanostructure was even at the ultra-high current density of 40 Ma cm-2. After 5,000 cycles, the specific capacitance can still be maintained at 87.9. Moreover, when we use NiCSCH _ 7H _ 4O _ 5s) three-dimensional netted nanostructures as anode materials and activated carbon as cathode materials to assemble asymmetric supercapacitors, It is found that the electrochemical performance of the whole asymmetric supercapacitor is very good: when the current density is 0.5 A g ~ (-1), the mass specific capacitance of the device reaches 71.4 F g ~ (-1) ~ (-1) V voltage, the maximum energy density can reach 23.8 W 路kg ~ (-1) and the maximum power density is 388.2 W / kg ~ (-1). At the same time, the cyclic stability and Coulomb efficiency of asymmetric devices are also good. These excellent properties imply that the application of the NiCSP _ 7H _ 4O _ 5C _ C _ S _ 7H _ 4O _ 5) three-dimensional netted nanostructures in supercapacitors has great potential. (2) the Ni-C8H6O5Ni-Tp) metal-organic framework materials have been successfully prepared by hydrothermal method and, in order to improve their conductivity, We deposited a layer of Polyaniline on its surface by electrochemical deposition. The electrochemistry analysis shows that Ni-Tp / pani shows good electrochemical performance: its specific capacitance reaches 10.327F cm-2 at the current density of 20mA cm-2. At the same time, after 3000 cycles, the specific capacitance of Ni-Tp / pani material can be maintained at 85.35 at the ultra-high current density of 50 Ma cm-2, which indicates that the cycle stability of Ni-Tp/PANI is good, and the Coulomb efficiency is above 96% during the whole cycle. The results show that the electrochemical reaction in the whole system has good reversibility. (3) NiCstack _ 7H _ 4O _ 5) one-dimensional nanoarrays have been successfully prepared by hydrothermal method. At the same time, the electrochemical analysis shows that the one-dimensional nanoarrays have good electrochemical performance: the specific capacitance reaches 1.63F cm-2(543.3 / g at the current density of 3mA cm-2 / 1 / g. At the same time, after 3000 cycles, the specific capacitance of the one-dimensional NiSCH _ 7H _ S _ 4O _ 5) sample can still be maintained at 85 under the ultra-high current density of 21 Ma ~ cm ~ (-2) / 7A / g), which shows that the one-dimensional Nistac _ 7H _ 4O _ S _ 5) sample has good cyclic stability. The Coulomb efficiency of one-dimensional NiC7H _ 4O _ s _ 5) samples remained above 94% during the whole cycle, which indicated that the electrochemical reaction in the whole system was very reversible.
【学位授予单位】：南昌大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O641.4;TM53

【参考文献】