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在能源转化与存储领域,寻找优异的电极材料是目前的研究热点。以电剥离石墨烯为载体,硝酸钴、硝酸镍为原料,通过水热自组装制备了电剥离石墨烯负载钴镍双金属氢氧化物纳米线复合材料(CoNi-DHNW/EG)。以X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)等对材料的结构和形貌进行了表征。结果表明,钴镍双金属氢氧化物以纳米线的形式均匀分布在石墨烯上,其直径约为20nm。将CoNi-DHNW/EG用作超级电容器的电极材料,考察了其在电存储方面的应用性能,发现当钴镍双金属氢氧化物与电剥离石墨烯的质量比为7∶3,Co(OH)2和Ni(OH)2的物质的量比为2∶1,水热温度为120℃时,得到的Co0.66Ni0.33-DHNW/EG复合材料具有最佳的电存储性能,其比电容达到225F·g-1。该复合材料制备简单、原料易得、对环境无害,因此有望在能源存储与转化领域发挥重要作用。
In the field of energy conversion and storage, looking for excellent electrode materials is the current research focus. Electrically-grafted cobalt-nickel double metal hydroxide nanocomposite (CoNi-DHNW / EG) was prepared by hydrothermal self-assembly using graphene as a carrier, cobalt nitrate and nickel nitrate as raw materials. The structure and morphology of the material were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that the cobalt-nickel double metal hydroxide in the form of nanowires evenly distributed on the graphene, its diameter is about 20nm. CoNi-DHNW / EG was used as the electrode material of the supercapacitor and its electrical storage properties were investigated. It was found that when Co (OH) 2 ) 2 and Ni (OH) 2 is 2:1, hydrothermal temperature is 120 ℃, the obtained Co0.66Ni0.33-DHNW / EG composite has the best electrical storage performance, and its specific capacitance Reached 225F · g-1. The composite material is simple to prepare, easy to obtain raw materials, environmentally friendly, and therefore expected to play an important role in the field of energy storage and conversion.