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

doi:10.1016/j.jcis.2025.02.063

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

2025-06-01

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DOI：10.1016/j.jcis.2025.02.063

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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.

Keywords:

Au quantum dots

Energy storage

Sandwich-structured nanocomposite

Equivalent micro-capacitor

Coulomb blockade

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

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