石墨烯的宏量制备及其复合材料的电化学储能特性研究
发布时间：2018-09-04 06:31
【摘要】：超级电容器是一种绿色环保的具有高功率密度的电化学储能器件，其中电极材料的结构和性质对超级电容器的性能起着非常重要的作用。通常具有高比表面积、高电导率的碳材料拥有较高的双电层电容，某些金属氢氧化物则具有较高的理论赝电容，将两者结合构建形成的复合材料作为活性电极材料，是实现高能量密度、高功率密度超级电容器的可行方案，也是目前电极材料研究的热点之一。目前以碳材料作为载体负载金属氢氧化物，通过二者协同作用获得的高性能碳基复合材料已被广泛研究，其中以石墨烯基复合电极材料最受关注。石墨烯独特的二维结构赋予了它高的比表面积和优异电子传输能力，因此它是一种具有高双电层电容的电极材料，而金属氢氧化物中的氢氧化镍是一种具有高理论赝电容的活性物质，本论文主要围绕具有优异电容性能的石墨烯/氢氧化镍复合电极材料，在以下几个方面展开研究。 1.石墨烯的制备是合成石墨烯基复合电极材料的基础，而石墨烯的宏量制备一直是限制其应用的一个重要因素。基于本课题组的前期研究，，利用改进的Hummers方法，对石墨烯的制备工艺进行了调控，成功地实现了石墨烯的宏量制备。并对宏量制备获得的样品与传统小批量制备所获得的样品进行结构、性质对比，结果证实了宏量制备工艺的可行性。 2.将宏量制备工艺和小批量方法获得的氧化石墨分别与具有高赝电容的氢氧化镍进行复合，合成石墨烯/氢氧化镍复合电极材料，探究了氧化石墨的不同制备工艺对于复合材料结构、性质的影响。结果表明以两种工艺制备得到的氧化石墨为原料制备所得复合电极材料的结构和性质无明显差异，进一步验证了宏量制备工艺的可行性。 3.以宏量制备工艺获得的氧化石墨为前驱体，进一步研究了石墨烯/氢氧化镍复合电极材料的电化学性能，探讨不同氢氧化镍含量、不同干燥方式、以及导电添加剂的加入对复合材料电化学性能的影响。
[Abstract]:Supercapacitors are environmentally friendly electrochemical energy storage devices with high power density. The structure and properties of electrode materials play an important role in the performance of supercapacitors. Carbon materials with high specific surface area and high conductivity have high double layer capacitance, and some metal hydroxides have higher theoretical pseudo-capacitance. The composite materials formed by the combination of the two materials are used as active electrode materials. It is a feasible scheme to realize high energy density and high power density supercapacitors, and it is also one of the hot spots in electrode materials research. At present, metal hydroxides supported on carbon materials have been widely studied, among which graphene based composite electrode materials have attracted the most attention. The unique two-dimensional structure of graphene gives it high specific surface area and excellent electron transport ability, so it is a kind of electrode material with high double layer capacitance. Nickel hydroxide in metal hydroxide is a kind of active material with high theoretical pseudo-capacitance. In the following aspects of research. 1. The preparation of graphene is the basis for the synthesis of graphene based composite electrode materials, and the macroscopical preparation of graphene is an important factor limiting its application. Based on the previous research of our group, the preparation process of graphene was regulated by the improved Hummers method, and the macroscopical preparation of graphene was successfully realized. The structure and properties of the samples obtained by macro volume preparation were compared with those obtained by traditional small batch preparation. The results show that the preparation process of macro volume is feasible. 2. Graphene / nickel hydroxide composite electrode materials were synthesized by compounding graphite oxide obtained by macro preparation and small batch method with nickel hydroxide with high pseudo-capacitance. The effects of different preparation processes of graphite oxide on the structure and properties of composites were investigated. The results show that there is no obvious difference in structure and properties of the composite electrode materials prepared from graphite oxide prepared by two kinds of processes, which further verifies the feasibility of the macroscopical preparation process. The electrochemical properties of graphene / nickel hydroxide composite electrode materials were further studied by using graphite oxide as precursor, and different nickel hydroxide contents and drying methods were discussed. And the effect of conductive additives on the electrochemical properties of composites.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TQ127.11;TM53
本文编号：2221291
[Abstract]:Supercapacitors are environmentally friendly electrochemical energy storage devices with high power density. The structure and properties of electrode materials play an important role in the performance of supercapacitors. Carbon materials with high specific surface area and high conductivity have high double layer capacitance, and some metal hydroxides have higher theoretical pseudo-capacitance. The composite materials formed by the combination of the two materials are used as active electrode materials. It is a feasible scheme to realize high energy density and high power density supercapacitors, and it is also one of the hot spots in electrode materials research. At present, metal hydroxides supported on carbon materials have been widely studied, among which graphene based composite electrode materials have attracted the most attention. The unique two-dimensional structure of graphene gives it high specific surface area and excellent electron transport ability, so it is a kind of electrode material with high double layer capacitance. Nickel hydroxide in metal hydroxide is a kind of active material with high theoretical pseudo-capacitance. In the following aspects of research. 1. The preparation of graphene is the basis for the synthesis of graphene based composite electrode materials, and the macroscopical preparation of graphene is an important factor limiting its application. Based on the previous research of our group, the preparation process of graphene was regulated by the improved Hummers method, and the macroscopical preparation of graphene was successfully realized. The structure and properties of the samples obtained by macro volume preparation were compared with those obtained by traditional small batch preparation. The results show that the preparation process of macro volume is feasible. 2. Graphene / nickel hydroxide composite electrode materials were synthesized by compounding graphite oxide obtained by macro preparation and small batch method with nickel hydroxide with high pseudo-capacitance. The effects of different preparation processes of graphite oxide on the structure and properties of composites were investigated. The results show that there is no obvious difference in structure and properties of the composite electrode materials prepared from graphite oxide prepared by two kinds of processes, which further verifies the feasibility of the macroscopical preparation process. The electrochemical properties of graphene / nickel hydroxide composite electrode materials were further studied by using graphite oxide as precursor, and different nickel hydroxide contents and drying methods were discussed. And the effect of conductive additives on the electrochemical properties of composites.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TQ127.11;TM53
【参考文献】
相关期刊论文 前1条
1 杨红生,周啸,冯天富,汤孝平;电化学电容器最新研究进展 I.双电层电容器[J];电子元件与材料;2003年02期
本文编号：2221291
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