几种金属氧化物纳米材料的制备及其赝电容器性能研究
发布时间：2018-07-29 07:02
【摘要】：超级电容器,又叫电化学电容器,是一种性能介于电池与传统电容器之间的新型、高效、实用的能量存储装置,具有功率密度高、充放电速度快、使用寿命长、环境友好等优点。本论文围绕了MnO2,WO3等金属氧化物及其复合材料的设计、制备及其在柔性赝电容器和电致变色储能器件上的应用展开了系统深入的研究,取得的主要结论如下:1.研究了非晶的MnO2纳米结构生长和电化学性能,初步探索了MnO2作为电极在柔性超级电容器中的应用。通过电沉积,引入掺杂,得到非晶的MnO2纳米线。这种非晶MnO2纳米线具有更加优越的电化学性能,在1 A g-1时,其比电容达到334.7 F g-1。基于非晶WL-MnO2的柔性对称电容器,具有良好的柔性和电化学性能,即使在弯折状态下其电化学性能也不会明显发生变化。2.利用一种简单有效的氢化处理方法,显著提高ZnO的载流子浓度,明显改善ZnO的电学和电化学性能。以HZnO(氢化ZnO)纳米线为核,设计了一种高导电的具有优良电化学活性的HZnO@MnO2核壳结构电极,组装柔性对称电容器。以TiO2染料敏化太阳能电池为能源收集器件,HZnO@MnO2超级电容器为能源储存器件,组成自驱动系统,拓展了超级电容器的应用。3.设计和组装了以MnO2为正极材料,两种不同金属氧化物为负极材料的非对称超级电容器。通过简单的水热法合成了α-MnO2纳米线,通过牺牲模板法制备了非晶Fe2O3纳米管,以它们分别为正负电极,组装了柔性MnO2//Fe2O3非对称超级电容器,扩大工作电压窗口(至1.6 V)和提高储能密度(达到0.5 mWh cm-3);探索了交互沉积法在超级电容器中的应用,制备了多层的CNT-MnO2和CNT-MoO3电极,以此为基础,组装了CNT-MnO2//CNT-MoO3非对称超级电容器,能量密度达到1.7 mWh cm-3。4.通过蒸镀方法,得到不同厚度WO3薄膜电极。制备了基于WO3薄膜大面积(15cm×15 cm)电致变色超级电容器。探索了不同膜厚的WO3薄膜的电荷存储机理,发现100 nm时综合电容行为最好;在100 mV s-1时,电容性容量占有95%;探索了100 nm WO3薄膜的电容贡献比例,其中赝电容起主要作用,基本维持在70%左右。
[Abstract]:Supercapacitor, also called electrochemical capacitor, is a new type of energy storage device with high power density, high charge and discharge speed and long service life. Environmental friendliness, etc. In this paper, the design, preparation and application of metal oxides such as MNO _ 2WO _ 3 and their composites in flexible pseudo-capacitors and electrochromic energy storage devices have been studied systematically and deeply. The main conclusions are as follows: 1. The growth and electrochemical properties of amorphous MnO2 nanostructures were investigated. The application of MnO2 as electrode in flexible supercapacitors was preliminarily explored. Amorphous MnO2 nanowires were obtained by electrodeposition and doping. The amorphous MnO2 nanowires have better electrochemical performance. The specific capacitance of the amorphous MnO2 nanowires reaches 334.7 F g-1 at 1 A g ~ (-1). The flexible symmetric capacitors based on amorphous WL-MnO2 have good flexibility and electrochemical performance, and their electrochemical properties will not change obviously even in the bending state. A simple and effective hydrogenation method was used to improve the carrier concentration of ZnO and the electrical and electrochemical properties of ZnO. Using HZnO (hydrogenated ZnO) nanowires as the core, a highly conductive HZnO@MnO2 core-shell structure electrode with excellent electrochemical activity was designed to assemble flexible symmetric capacitors. Using TiO2 dye sensitized solar cells as energy collection devices, HZnO @ MnO2 supercapacitors as energy storage devices, self-drive system is formed, which expands the application of supercapacitors. Asymmetric supercapacitors with MnO2 as cathode materials and two different metal oxides as negative materials were designed and assembled. 伪 -MnO2 nanowires were synthesized by a simple hydrothermal method. Amorphous Fe2O3 nanotubes were fabricated by sacrificial template method. Flexible MnO2//Fe2O3 asymmetric supercapacitors were assembled by using them as positive and negative electrodes respectively. Expanding the working voltage window (up to 1.6 V) and increasing the energy storage density (up to 0.5 mWh cm-3), the application of the interactive deposition method in supercapacitors was explored, and the multilayer CNT-MnO2 and CNT-MoO3 electrodes were prepared, on the basis of which the asymmetric CNT-MnO2//CNT-MoO3 supercapacitors were assembled. The energy density is 1.7 mWh cm-3.4. WO3 thin film electrode with different thickness was obtained by evaporation. A large area (15cm 脳 15 cm) electrochromic supercapacitor based on WO3 thin film was prepared. The charge storage mechanism of WO3 thin films with different thickness was investigated. It was found that the comprehensive capacitance behavior was the best at 100nm; at 100mV s ~ (-1), the capacitance capacity occupied 95%; and the capacitance contribution ratio of 100nm WO3 thin films was explored, in which pseudo-capacitance played a major role. Basically maintained at about 70%.
【学位授予单位】：暨南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM53;TB383.1
本文编号：2151893
[Abstract]:Supercapacitor, also called electrochemical capacitor, is a new type of energy storage device with high power density, high charge and discharge speed and long service life. Environmental friendliness, etc. In this paper, the design, preparation and application of metal oxides such as MNO _ 2WO _ 3 and their composites in flexible pseudo-capacitors and electrochromic energy storage devices have been studied systematically and deeply. The main conclusions are as follows: 1. The growth and electrochemical properties of amorphous MnO2 nanostructures were investigated. The application of MnO2 as electrode in flexible supercapacitors was preliminarily explored. Amorphous MnO2 nanowires were obtained by electrodeposition and doping. The amorphous MnO2 nanowires have better electrochemical performance. The specific capacitance of the amorphous MnO2 nanowires reaches 334.7 F g-1 at 1 A g ~ (-1). The flexible symmetric capacitors based on amorphous WL-MnO2 have good flexibility and electrochemical performance, and their electrochemical properties will not change obviously even in the bending state. A simple and effective hydrogenation method was used to improve the carrier concentration of ZnO and the electrical and electrochemical properties of ZnO. Using HZnO (hydrogenated ZnO) nanowires as the core, a highly conductive HZnO@MnO2 core-shell structure electrode with excellent electrochemical activity was designed to assemble flexible symmetric capacitors. Using TiO2 dye sensitized solar cells as energy collection devices, HZnO @ MnO2 supercapacitors as energy storage devices, self-drive system is formed, which expands the application of supercapacitors. Asymmetric supercapacitors with MnO2 as cathode materials and two different metal oxides as negative materials were designed and assembled. 伪 -MnO2 nanowires were synthesized by a simple hydrothermal method. Amorphous Fe2O3 nanotubes were fabricated by sacrificial template method. Flexible MnO2//Fe2O3 asymmetric supercapacitors were assembled by using them as positive and negative electrodes respectively. Expanding the working voltage window (up to 1.6 V) and increasing the energy storage density (up to 0.5 mWh cm-3), the application of the interactive deposition method in supercapacitors was explored, and the multilayer CNT-MnO2 and CNT-MoO3 electrodes were prepared, on the basis of which the asymmetric CNT-MnO2//CNT-MoO3 supercapacitors were assembled. The energy density is 1.7 mWh cm-3.4. WO3 thin film electrode with different thickness was obtained by evaporation. A large area (15cm 脳 15 cm) electrochromic supercapacitor based on WO3 thin film was prepared. The charge storage mechanism of WO3 thin films with different thickness was investigated. It was found that the comprehensive capacitance behavior was the best at 100nm; at 100mV s ~ (-1), the capacitance capacity occupied 95%; and the capacitance contribution ratio of 100nm WO3 thin films was explored, in which pseudo-capacitance played a major role. Basically maintained at about 70%.
【学位授予单位】：暨南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM53;TB383.1
【参考文献】
相关期刊论文 前1条
1 陈中威;强鹏飞;杨培华;麦文杰;李玲;;热蒸镀法制备WO_3薄膜及其电致变色性能[J];暨南大学学报(自然科学与医学版);2014年02期
，本文编号：2151893
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