Microstructures, electrical behavior and energy storage properties of Ag@shell/PVDF-based polymers: different effects between an organic polydopamine shell and inorganic zinc oxide shell
Microstructures, electrical behavior and energy storage properties of Ag@shell/PVDF-based polymers: different effects between an organic polydopamine shell and inorganic zinc oxide shell
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Ag@shell/PVDF基聚合物的微观结构、电学行为和储能性能：有机聚多巴胺壳和无机氧化锌壳之间的不同影响
DOI：
10.1007/s10853-020-05081-9
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发表时间：
2020-07-31
影响因子：
4.5
通讯作者：
Liu, Lizhu
中科院分区：
文献类型：
--
作者：
Guan, Lizhu;Weng, Ling;Liu, Lizhu
成功合成了银@聚多巴胺（Ag@PDA）和银@氧化锌（Ag@ZnO）两种一维核壳纳米棒，并将其掺杂到聚偏氟乙烯（PVDF）中制备复合材料。研究了有机PDA壳层和无机ZnO壳层表面改性对PVDF复合材料结构和介电性能的不同影响。结果表明，ZnO壳层为晶态结构，而PDA壳层为非晶态结构.由于包覆层晶体结构的差异，Ag@ZnO/PVDF复合材料的介电性能优于Ag@PDA/PVDF复合材料，而Ag@PDA/PVDF复合材料的力学性能优于Ag @ ZnO/PVDF复合材料。ZnO的晶化结构不仅促进了PVDF分子的晶型转化，而且有效地限制了复合材料中载流子的运动。当填料含量为10wt%时，Ag@PDA/PVDF和Ag@ZnO/PVDF复合材料的储能密度分别比纯PVDF膜提高了79.53%和209.2%。此外，Ag@ZnO/PVDF复合材料的充放电效率也高于纯PVDF和Ag@PDA/PVDF复合材料。当在1800 kV/cm电强度下测试时，Ag@ZnO/PVDF复合材料的储能密度增加到4.02 J/cm（3）。
Two kinds of 1D core-shell nanorods silver@polydopamine (Ag@PDA) and silver@zinc oxide (Ag@ZnO) were successfully synthesized and doped into polyvinylidene fluoride (PVDF) to fabricate composites. The different surface modification effects between the organic PDA shell and inorganic ZnO shell on structure and dielectric properties of PVDF composites were investigated. Results indicated that the ZnO shell showed a crystalline structure, while the PDA shell is amorphous. Due to the difference in crystal structure of the coating shell, the Ag@ZnO/PVDF composites showed a better dielectric performance than the Ag@PDA/PVDF composites, while the Ag@PDA/PVDF showed excellent mechanical properties. The crystallized structure of ZnO not only promoted the crystal conversion of PVDF molecules, but also effectively limited the movement of charge carriers in composites. In the case of 10wt% fillers' content and before breakdown strength, the energy storage densities of Ag@PDA/PVDF and Ag@ZnO/PVDF composites are 79.53% and 209.2% higher than that of pure PVDF films, respectively. Moreover, the charge/discharge efficiency of Ag@ZnO/PVDF composite is also higher than that of pure PVDF and Ag@PDA/PVDF composite. When testing at 1800 kV/cm electrical strength, the energy storage density of Ag@ZnO/PVDF composite increases to 4.02 J/cm(3).