纳米复合材料
材料科学
电介质
聚合物
电容
复合材料
聚合物纳米复合材料
甲基丙烯酸酯
化学工程
量子点
纳米技术
光电子学
共聚物
电极
化学
工程类
物理化学
作者
Hairui Bai,Guanglong Ge,Fei Yan,Kun Zhu,Jin Qian,Cheng Shi,Yanxia Li,Haijiao Xie,Bo Shen,Jiwei Zhai
标识
DOI:10.1016/j.cej.2023.142428
摘要
Simultaneous enhancement in dielectric constant and electric breakdown strength is the desired way for polymer-based dielectric materials to achieve a high discharge energy density. Herein, an artificial gradient trilayered polymer nanocomposite with remarkable energy storage performance is proposed. Two-dimensional Sr2Nb2O7 nanosheets (SNO NSs) functionalized with polydopamine and Ag-quantum-dots (D-SNO@Ag NSs) are introduced into a poly(vinylidene fluoride)/polymethyl methacrylate (PVDF/PMMA) blend polymer matrix (BPM). Attributed to the incorporation of Ag-quantum-dots (Ag QDs) on the surface of SNO NSs, the local capacitance around SNO NSs is improved and the electron migration near the Ag QDs is inhibited. As a result, a large Weibull breakdown strength (585.13 MV m−1) and an enhanced dielectric constant (13.98) was obtained to achieve a high difference between electric displacement and remnant electric displacement (12.98 μC cm−2 at 580 MV m−1) from the gradient trilayered nanocomposite, which contributes a remarkable discharge energy density of 31.0 J cm−3 with a charge–discharge efficiency of 66%.
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