Ultrathin Nickel-Cobalt Phosphate 2D Nanosheets for Electrochemical Energy Storage under Aqueous/Solid-State Electrolyte
Ultrathin Nickel-Cobalt Phosphate 2D Nanosheets for Electrochemical Energy Storage under Aqueous/Solid-State Electrolyte
复制标题
用于水/固态电解质下电化学储能的超薄镍钴磷酸盐二维纳米片
DOI：
10.1002/adfm.201605784
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发表时间：
2017-03-24
影响因子：
19
通讯作者：
Pang, Huan
中科院分区：
文献类型：
--
作者：
Li, Bing;Gu, Peng;Pang, Huan
2D材料由于其柔性、薄度和透明性的巨大优势，是构建柔性电化学能量存储设备的理想选择。在这里，提出了一个简单的一步水热法合成镍钴磷酸盐2D纳米片，并通过电化学测量所获得的镍钴磷酸盐的赝电容性能的结构的影响进行了研究。结果表明，Ni/Co比为4：5的纳米片具有最好的电化学储能性能，最大比电容可达1132.5F g（-1）。更重要的是，已经组装了水性和固态柔性电化学能量存储装置。水性装置在0.6kW kg（-1）的功率密度下显示出32.5Wh kg（-1）的高能量密度，并且固态装置在0.7kW kg（-1）的功率密度下显示出35.8Wh kg（-1）的高能量密度。这些优异的性能证实了镍钴磷酸盐2D纳米片是用于电化学储能装置的有前途的材料。
2D materials are ideal for constructing flexible electrochemical energy storage devices due to their great advantages of flexibility, thinness, and transparency. Here, a simple one-step hydrothermal process is proposed for the synthesis of nickel-cobalt phosphate 2D nanosheets, and the structural influence on the pseudocapacitive performance of the obtained nickel-cobalt phosphate is investigated via electrochemical measurement. It is found that the ultrathin nickel-cobalt phosphate 2D nanosheets with an Ni/Co ratio of 4: 5 show the best electrochemical performance for energy storage, and the maximum specific capacitance up to 1132.5 F g(-1). More importantly, an aqueous and solidstate flexible electrochemical energy storage device has been assembled. The aqueous device shows a high energy density of 32.5 Wh kg(-1) at a power density of 0.6 kW kg(-1), and the solid-state device shows a high energy density of 35.8 Wh kg(-1) at a power density of 0.7 kW kg(-1). These excellent performances confirm that the nickel-cobalt phosphate 2D nanosheets are promising materials for applications in electrochemical energy storage devices.