Covalently engineering novel sandwich-like rGO@POSS nanofillers for high-performance dielectric energy storage of PVDF film capacitor

IF 8.3 1区 材料科学 Q1 MATERIALS SCIENCE, COMPOSITES Composites Science and Technology Pub Date : 2024-10-26 DOI:10.1016/j.compscitech.2024.110938
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Abstract

With the development of modern electronic and electrical industry, it is still a great challenge to develop poly(vinylidene fluoride) (PVDF) based dielectric capacitors with high energy storage capability. Herein, a novel sandwich-like nanofiller was constructed via covalently grafting polyhedral oligomeric silsesquioxane onto graphene oxide nanosheets (GO@POSS), further PVDF/rGO@POSS film were fabricated via solvent-casting and in-situ thermal reduction processes. The results indicated that the grafting of POSS promoted the uniform dispersion of nanofillers to realize strong interfacial interaction with PVDF matrix. The optimal PVDF film containing 0.75 wt% rGO@POSS (0.75PGP-60) exhibited larger dielectric constant (εr = 13.32) and higher breakdown strength (Eb = 339.1 MV m−1), thus resulting in synchronous improvements on energy density (Ue = 5.42 J·cm−3) and charge-discharge efficiency (η = 73.1 %), which increased by 95.0 % and 19.4 % compared to pure PVDF, respectively. Meanwhile, it presented excellent cycling stability with 97.6 % energy density retention after 10000th cycles. The improved energy storage capability was attributed to reasonably-designed sandwich-like nanofiller: the formation of rGO micro-capacitors raised the dielectric constant of PVDF nanocomposites, while the insulative POSS layer helped to improve its breakdown strength and decrease its dielectric loss. The current work provides a novel and efficient paradigm to design PVDF nanocomposites with promising dielectric properties and energy storage capacity, and further contributes to broadening the practical applications of advanced dielectric capacitors.

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共价工程化新型夹层状 rGO@POSS 纳米填料,用于 PVDF 薄膜电容器的高性能电介质储能
随着现代电子电气工业的发展,开发基于聚偏二氟乙烯(PVDF)的高储能电介质电容器仍是一项巨大挑战。本文通过在氧化石墨烯纳米片(GO@POSS)上共价接枝多面体低聚硅倍半氧烷,构建了一种新型的三明治状纳米填料,并进一步通过溶剂浇铸和原位热还原工艺制备了 PVDF/rGO@POSS 薄膜。结果表明,POSS 的接枝促进了纳米填料的均匀分散,实现了与 PVDF 基体的强界面相互作用。含有 0.75 wt% rGO@POSS 的最佳 PVDF 薄膜(0.75PGP-60)表现出更大的介电常数(εr = 13.32)和更高的击穿强度(Eb = 339.1 MV m-1),从而使能量密度(Ue = 5.42 J-cm-3)和充放电效率(η = 73.1 %)同步提高,与纯 PVDF 相比分别提高了 95.0 % 和 19.4 %。同时,它还具有出色的循环稳定性,在循环 10000 次后,能量密度保持率为 97.6%。储能能力的提高归功于合理设计的三明治状纳米填料:rGO 微电容器的形成提高了 PVDF 纳米复合材料的介电常数,而绝缘的 POSS 层则有助于提高其击穿强度并降低介电损耗。目前的研究工作为设计具有良好介电性能和储能能力的 PVDF 纳米复合材料提供了一种新颖、高效的范例,有助于进一步拓宽先进介质电容器的实际应用。
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来源期刊
Composites Science and Technology
Composites Science and Technology 工程技术-材料科学:复合
CiteScore
16.20
自引率
9.90%
发文量
611
审稿时长
33 days
期刊介绍: Composites Science and Technology publishes refereed original articles on the fundamental and applied science of engineering composites. The focus of this journal is on polymeric matrix composites with reinforcements/fillers ranging from nano- to macro-scale. CSTE encourages manuscripts reporting unique, innovative contributions to the physics, chemistry, materials science and applied mechanics aspects of advanced composites. Besides traditional fiber reinforced composites, novel composites with significant potential for engineering applications are encouraged.
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