Remarkably boosting capacitive energy storage of layer-structured nanocomposites via the incorporation of Au quantum dots

IF 9.4 1区 化学 Q1 CHEMISTRY, PHYSICAL
Peng Yin , Meng Hao , Xiaohan Bie , Qingyang Tang , Shuimiao Xia , Linwei Zhu , Davoud Dastan , Yinguo Li , Zhicheng Shi
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Abstract

Polymer dielectrics are widely employed in pulsed energy storage and conversion systems due to their ultrahigh power density, fast discharge speed, and reliability. However, their low discharge energy densities pose a significant limitation for application in miniaturized and integrated devices. Here, a significantly enhanced energy storage property is achieved via incorporating Au quantum dots (QDs) into a sandwich-structured nanocomposite, where the PMMA/P(VDF-HFP) (A/F) blended polymer serves as middle layer and the P(VDF-HFP) acts as outer layer. Benefiting from the micro-capacitor and Coulomb blockade effects induced by the Au QDs, the resulting nanocomposite simultaneously achieves enhanced dielectric constant of 10.34 at 10 kHz and breakdown strength of 577.3 MV m−1. Subsequently, a significantly enhanced discharge energy density of 16.07 J cm−3 is further acquired, which is approximately 177.1 % that of the nanocomposite without Au QDs. This work proposes a novel structure design combining Au quantum dots with a sandwich-structured composites, which also provides a feasible paradigm for optimizing the energy storage performance of polymer dielectrics.

Abstract Image

金量子点的加入显著提高了层状结构纳米复合材料的电容储能性能
聚合物电介质以其超高的功率密度、快速的放电速度和高的可靠性在脉冲储能和转换系统中得到了广泛的应用。然而,它们的放电能量密度低,严重限制了其在小型化和集成化器件中的应用。在这里,通过将金量子点(QDs)加入三明治结构的纳米复合材料中,PMMA/P(VDF-HFP) (a /F)混合聚合物作为中间层,P(VDF-HFP)作为外层,实现了显著增强的储能性能。受益于Au量子点引起的微电容和库仑封锁效应,所得到的纳米复合材料在10 kHz时的介电常数提高了10.34,击穿强度达到577.3 MV m−1。随后,进一步获得了16.07 J cm−3的放电能量密度,约为没有Au量子点的纳米复合材料的177.1%。本工作提出了一种将金量子点与三明治结构复合材料相结合的新型结构设计,也为优化聚合物电介质的储能性能提供了一种可行的范例。
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来源期刊
CiteScore
16.10
自引率
7.10%
发文量
2568
审稿时长
2 months
期刊介绍: The Journal of Colloid and Interface Science publishes original research findings on the fundamental principles of colloid and interface science, as well as innovative applications in various fields. The criteria for publication include impact, quality, novelty, and originality. Emphasis: The journal emphasizes fundamental scientific innovation within the following categories: A.Colloidal Materials and Nanomaterials B.Soft Colloidal and Self-Assembly Systems C.Adsorption, Catalysis, and Electrochemistry D.Interfacial Processes, Capillarity, and Wetting E.Biomaterials and Nanomedicine F.Energy Conversion and Storage, and Environmental Technologies
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