Improved Discharge Energy Density of Poly(vinylidene fluoride)-Based Nanocomposites via a Small Amount of Dopamine-Modified TiO2 Nanosheets
Improved Discharge Energy Density of Poly(vinylidene fluoride)-Based Nanocomposites via a Small Amount of Dopamine-Modified TiO2 Nanosheets
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DOI：
10.1007/s11664-021-08763-5
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发表时间：
2021-05-20
影响因子：
2.1
通讯作者：
Nie, Wei
中科院分区：
文献类型：
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作者：
Xu, Jingjing;Fu, Chao;Nie, Wei
介质电容器以其快速的充放电速度和较高的功率密度受到越来越多的关注，在先进的电子设备和电力系统中得到了广泛的应用。本文通过水热反应和原位聚合的方法制备了多巴胺修饰的二氧化钛(TiO2@PDA)纳米片。然后通过溶液共混的方法将合成的二氧化钛@PDA纳米片材引入到聚偏氟乙烯(PVDF)中。我们的结果表明，负载少量的二氧化钛@PDA纳米片可以有效地提高纳米复合材料的储能性能。例如，在195 mV/m下，9wt.%的二氧化钛@PDA/PVDF纳米复合材料的放电能量密度为10.53J/cm(3)，是纯PVDF(6.01 J/cm(3))(170 mV/m)放电能量密度的1.75倍。这种显著的改善是由于大的纵横比以及对二氧化钛纳米片的多巴胺修饰。该研究为制备具有优异储能性能的纳米复合材料提供了一条可行的途径。
Dielectric capacitors have attracted increasing attention for their fast charge-discharge speeds as well as high power density, and they have been widely used in advanced electronics and electric power systems. Here, dopamine-modified TiO2 (TiO2@PDA) nanosheets were synthesized via hydrothermal reaction and in situ polymerization. Then the synthesized TiO2@PDA nanosheets were introduced into the poly(vinylidene fluoride) (PVDF) matrix via solution blending. Our results reveal that loading a small amount of TiO2@PDA nanosheets can effectively enhance the energy storage performance of the nanocomposites. For example, a superior discharge energy density with 10.53 J/cm(3) is obtained for the 9 wt.% TiO2@PDA/PVDF nanocomposite at 195 MV/m, which is 1.75 times as large as discharge energy density of pure PVDF (6.01 J/cm(3) at 170 MV/m). Such significant improvement is due to the large aspect ratio as well as dopamine modification of the TiO2 nanosheets. The study provides a feasible way to prepare the nanocomposites with excellent energy storage performance.