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  本文選題：氧化鎳　切入點：氧化銅　出處：《中南大學》2014年碩士論文

【摘要】：超級電容器作為一種新型儲能裝置,因其高功率密度和循環(huán)壽命長,成為最有前景的儲能技術之一。金屬氧化物因其成本低、資源豐富、環(huán)境友好以及具有比較高的理論比容量,吸引了大量的研究者的興趣。本論文制備Ni-Cu和Ni-Co混合氧化物,對電極材料的微觀結構和形貌進行表征,利用循環(huán)伏安法、恒電流充放電和電化學阻抗等方法測試其電化學性能。主要內(nèi)容如下： 1.利用共沉淀法制備了NiO-CuO復合物,并對電極材料進行表征。研究發(fā)現(xiàn),復合物是由微球組成的,并且比表面積高達132m2/g。電化學測試顯示,復合物在1A/g的電流密度下,最大比電容可達到735F/g,比氧化鎳(351F/g)和氧化銅(262F/g)的比電容都高。在1A/g的電流密度下,充放電循環(huán)580次后,復合物仍能保持原比電容的98.2%。 2.采用溶液法制備Ni-Cu混合氧化物。研究發(fā)現(xiàn),鎳的氧化物附著在氧化銅的表面。復合物是球形和多孔結構。恒流充放電測試結果表明,復合物在1A/g的電流密度下,最大比電容可達到1131F/g,比氧化銅(262F/g)的比電容高。在1和16A/g的電流密度下,充放電循環(huán)1000次后,復合物分別保持原比電容的99.6和100%,而氧化銅只能保持92.3%。復合物電化學性能表明氧化銅和鎳的氧化物之間的協(xié)同效應導致比電容和循環(huán)穩(wěn)定性的提高。 3.采用溶液法制備Ni-Co混合氧化物。研究發(fā)現(xiàn)鎳的氧化物附著在四氧化三鉆的表面。復合物由一維結構和顆粒狀物質構成,并且具有較高的比表面積(70m2/g)。恒流充放電測試結果表明,復合物電極在2A/g電流密度下,最大比電容可達到1112F/g,比四氧化三鉆(360F/g)的比電容高。在2A/g的電流密度下,充放電循環(huán)1000次后,復合物仍能保持原比電容的97%,而四氧化三鈷只能保持95.9%。復合物電化學性能表明四氧化三鈷和鎳的氧化物之間的協(xié)同效應導致比電容和循環(huán)穩(wěn)定性的提高。
[Abstract]:As a new type of energy storage device, supercapacitor has become one of the most promising energy storage technologies due to its high power density and long cycle life.Metal oxides have attracted a lot of researchers because of their low cost, rich resources, environmental friendliness and high theoretical specific capacity.In this paper, Ni-Cu and Ni-Co mixed oxides were prepared, and the microstructure and morphology of the electrode materials were characterized. The electrochemical properties were measured by cyclic voltammetry, constant current charge-discharge and electrochemical impedance.The main contents are as follows:1.NiO-CuO composites were prepared by coprecipitation and the electrode materials were characterized.The complex is composed of microspheres and has a specific surface area of 132 m2 / g.Electrochemical measurements showed that the maximum specific capacitance of the composite was 735F / g at the current density of 1A/g, which was higher than that of nickel oxide 351F / g and copper oxide 262Fr / g.At the current density of 1A/g, the complex can maintain 98.2 of the original capacitance after 580th cycle of charge and discharge.2.Ni-Cu mixed oxides were prepared by solution method.It is found that the oxide of nickel adheres to the surface of copper oxide.The complex is spherical and porous.The constant current charge-discharge test results show that the maximum specific capacitance of the composite can reach 1131 F / g at the current density of 1A/g, which is higher than that of copper oxide 262 F / g.At the current density of 1 and 16A/g, after 1000 cycles, the complex maintained 99.6 and 100 of its original capacitance, respectively, while copper oxide could only maintain 92.3 percent.The electrochemical properties of the composite show that the synergistic effect between the oxides of copper oxide and nickel leads to the improvement of specific capacitance and cycle stability.3.Ni-Co mixed oxides were prepared by solution method.It is found that the oxide of nickel adheres to the surface of trioxide trioxide.The composite is composed of one-dimensional structure and granular material, and has a high specific surface area of 70 m2 / g 路g ~ (-1).The constant current charge-discharge test results show that the maximum specific capacitance of the composite electrode can reach 1112F / g at 2A/g current density, which is higher than that of 360F / g trioxide.At the current density of 2A/g, after 1000 cycles of charge and discharge cycles, the complex can maintain the original capacitance of 97 and cobalt tetroxide can only keep 95.9.The electrochemical properties of the composite show that the synergistic effect between cobalt tetroxide and nickel oxide leads to the improvement of specific capacitance and cycle stability.
【學位授予單位】：中南大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TQ138.13;TM53

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本文編號：1725896