幾種金屬氧化物納米材料的制備及其贗電容器性能研究
發(fā)布時間：2018-07-29 07:02
【摘要】：超級電容器,又叫電化學電容器,是一種性能介于電池與傳統(tǒng)電容器之間的新型、高效、實用的能量存儲裝置,具有功率密度高、充放電速度快、使用壽命長、環(huán)境友好等優(yōu)點。本論文圍繞了MnO2,WO3等金屬氧化物及其復合材料的設計、制備及其在柔性贗電容器和電致變色儲能器件上的應用展開了系統(tǒng)深入的研究,取得的主要結論如下:1.研究了非晶的MnO2納米結構生長和電化學性能,初步探索了MnO2作為電極在柔性超級電容器中的應用。通過電沉積,引入摻雜,得到非晶的MnO2納米線。這種非晶MnO2納米線具有更加優(yōu)越的電化學性能,在1 A g-1時,其比電容達到334.7 F g-1�；诜蔷L-MnO2的柔性對稱電容器,具有良好的柔性和電化學性能,即使在彎折狀態(tài)下其電化學性能也不會明顯發(fā)生變化。2.利用一種簡單有效的氫化處理方法,顯著提高ZnO的載流子濃度,明顯改善ZnO的電學和電化學性能。以HZnO(氫化ZnO)納米線為核,設計了一種高導電的具有優(yōu)良電化學活性的HZnO@MnO2核殼結構電極,組裝柔性對稱電容器。以TiO2染料敏化太陽能電池為能源收集器件,HZnO@MnO2超級電容器為能源儲存器件,組成自驅動系統(tǒng),拓展了超級電容器的應用。3.設計和組裝了以MnO2為正極材料,兩種不同金屬氧化物為負極材料的非對稱超級電容器。通過簡單的水熱法合成了α-MnO2納米線,通過犧牲模板法制備了非晶Fe2O3納米管,以它們分別為正負電極,組裝了柔性MnO2//Fe2O3非對稱超級電容器,擴大工作電壓窗口(至1.6 V)和提高儲能密度(達到0.5 mWh cm-3);探索了交互沉積法在超級電容器中的應用,制備了多層的CNT-MnO2和CNT-MoO3電極,以此為基礎,組裝了CNT-MnO2//CNT-MoO3非對稱超級電容器,能量密度達到1.7 mWh cm-3。4.通過蒸鍍方法,得到不同厚度WO3薄膜電極。制備了基于WO3薄膜大面積(15cm×15 cm)電致變色超級電容器。探索了不同膜厚的WO3薄膜的電荷存儲機理,發(fā)現(xiàn)100 nm時綜合電容行為最好;在100 mV s-1時,電容性容量占有95%;探索了100 nm WO3薄膜的電容貢獻比例,其中贗電容起主要作用,基本維持在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. 偽 -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%.
【學位授予單位】：暨南大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TM53;TB383.1
本文編號：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. 偽 -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%.
【學位授予單位】：暨南大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TM53;TB383.1
【參考文獻】
相關期刊論文 前1條
1 陳中威;強鵬飛;楊培華;麥文杰;李玲;;熱蒸鍍法制備WO_3薄膜及其電致變色性能[J];暨南大學學報(自然科學與醫(yī)學版);2014年02期
，本文編號：2151893
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