新型碳与锰氧化物纳米复合材料的制备及性能研究
发布时间：2018-11-19 10:05
【摘要】：近些年来,超级电容器由于具有诸多优势而逐渐受到社会的关注,很多人都将其视为一种很具潜力的电化学储能器件。在当前的研究中,碳基材料、导电高分子及过渡金属氧化物的复合材料因为其资源丰富、价格低廉和环境友好以及良好的电化学性能而成为研究热点。然而,石墨烯材料虽然理论的比表面积很大,但是实际上能够有效被利用的面积却很少,这是由于石墨烯容易发生团聚而导致有效的利用面积减少引起的。而在本课题研究中,我们采用经过改性处理的碳纳米管与氧化石墨烯复合,增大其可利用的比表面积,在此基础上通过一种简单易控的方法与锰氧化物复合,并对其复合材料的电化学性能进行测试。首先,通过在异丙醇-水二元体系中制备锰氧化物的纳米晶并使其沉积在氧化石墨烯的表面,从而制得氧化石墨烯-锰氧复合材料。通过对复合材料进行SEM、XRD、拉曼以及XPS等表征分析,分析不同投料比与冷却速度下样品的物性特征;然后,对其复合材料进行性能测试分析,发现当其投料比为1:9时,材料的性能达到最佳。相对于回流(初始温度80℃)冷却至室温,经过冰水(大约5℃)快速激冷后,材料具有更高的电化学性能。通过恒电流充放电计算得出回流冷却方式下比电容最大为253.12 F/g,其循环性能达到88.16%,而冰水快速激冷方式下比电容达到312.87 F/g,循环性能达到85.12%。在氧化石墨烯-锰氧化物复合的基础上,引入表面带不同电荷的碳纳米管,分析不同电负性的碳纳米管与氧化石墨烯的结合对材料性能的影响。通过相同的手段对材料进行物性分析和性能分析,发现带负电荷的碳纳米管的性能略优于带正电的碳纳米管。当碳纳米管与氧化石墨烯-锰氧化物的比例为1:1:6时,材料的性能达到最优,最大可达306.82 F/g,其循环稳定性能可高达76.87%。最后,通过保持氧化石墨烯-锰氧化物的比例不变,改变碳纳米管与氧化石墨烯的比例分析不同比例条件下对材料性能的影响,发现当碳纳米管含量的增加时,性能并没有相应的提升,这可能是由于碳纳米管在后续制备过程中出现团聚现象导致比表面积的减少所造成的。
[Abstract]:In recent years, supercapacitors have attracted more and more attention due to their many advantages. Many people regard supercapacitors as a potential electrochemical energy storage device. In the current research, carbon based materials, conductive polymers and transition metal oxide composites have become the focus of research because of their rich resources, low cost, environmental friendliness and good electrochemical performance. However, although the theoretical specific surface area of graphene materials is very large, in fact, the area that can be effectively utilized is very small, which is caused by the reduction of effective utilization area due to the easy agglomeration of graphene. In this study, we use modified carbon nanotubes (CNTs) and graphene oxide to increase the available specific surface area, and on this basis, we use a simple and easily controlled method to compound with manganese oxide. The electrochemical properties of the composites were tested. Firstly, the nanocrystalline of manganese oxide was prepared in isopropanol-water binary system and deposited on the surface of graphene oxide. The physical properties of the composites were analyzed by SEM,XRD, Raman and XPS analysis under different feed ratio and cooling rate. Then, the properties of the composites were tested and analyzed, and it was found that when the feed ratio was 1:9, the properties of the composites were the best. Compared with reflux (initial temperature 80 鈩，
本文编号：2341967
[Abstract]:In recent years, supercapacitors have attracted more and more attention due to their many advantages. Many people regard supercapacitors as a potential electrochemical energy storage device. In the current research, carbon based materials, conductive polymers and transition metal oxide composites have become the focus of research because of their rich resources, low cost, environmental friendliness and good electrochemical performance. However, although the theoretical specific surface area of graphene materials is very large, in fact, the area that can be effectively utilized is very small, which is caused by the reduction of effective utilization area due to the easy agglomeration of graphene. In this study, we use modified carbon nanotubes (CNTs) and graphene oxide to increase the available specific surface area, and on this basis, we use a simple and easily controlled method to compound with manganese oxide. The electrochemical properties of the composites were tested. Firstly, the nanocrystalline of manganese oxide was prepared in isopropanol-water binary system and deposited on the surface of graphene oxide. The physical properties of the composites were analyzed by SEM,XRD, Raman and XPS analysis under different feed ratio and cooling rate. Then, the properties of the composites were tested and analyzed, and it was found that when the feed ratio was 1:9, the properties of the composites were the best. Compared with reflux (initial temperature 80 鈩，
本文编号：2341967
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