Low-k nano-dielectrics facilitate electric-field induced phase transition in high-k ferroelectric polymers for sustainable electrocaloric refrigeration

Qiang Li, Luqi Wei, Ni Zhong, Xiaoming Shi, Donglin Han, Shanyu Zheng, Feihong Du, Junye Shi, Jiangping Chen, Houbing Huang, Chungang Duan and Xiaoshi Qian ()
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Qiang Li: Shanghai Jiao Tong University
Luqi Wei: East China Normal University
Ni Zhong: East China Normal University
Xiaoming Shi: Beijing Institute of Technology
Donglin Han: Shanghai Jiao Tong University
Shanyu Zheng: Shanghai Jiao Tong University
Feihong Du: Shanghai Jiao Tong University
Junye Shi: Shanghai Jiao Tong University
Jiangping Chen: Shanghai Jiao Tong University
Houbing Huang: Beijing Institute of Technology
Chungang Duan: East China Normal University
Xiaoshi Qian: Shanghai Jiao Tong University

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Ferroelectric polymer-based electrocaloric effect may lead to sustainable heat pumps and refrigeration owing to the large electrocaloric-induced entropy changes, flexible, lightweight and zero-global warming potential. Herein, low-k nanodiamonds are served as extrinsic dielectric fillers to fabricate polymeric nanocomposites for electrocaloric refrigeration. As low-k nanofillers are naturally polar-inactive, hence they have been widely applied for consolidate electrical stability in dielectrics. Interestingly, we observe that the nanodiamonds markedly enhances the electrocaloric effect in relaxor ferroelectrics. Compared with their high-k counterparts that have been extensively studied in the field of electrocaloric nanocomposites, the nanodiamonds introduces the highest volumetric electrocaloric enhancement (~23%/vol%). The resulting polymeric nanocomposite exhibits concurrently improved electrocaloric effect (160%), thermal conductivity (175%) and electrical stability (125%), which allow a fluid-solid coupling-based electrocaloric refrigerator to exhibit an improved coefficient of performance from 0.8 to 5.3 (660%) while maintaining high cooling power (over 240 W) at a temperature span of 10 K.

Date: 2024
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DOI: 10.1038/s41467-024-44926-8

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