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Created
August 11, 2022 08:49
by
sle34
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Updated
August 11, 2022 08:49
by
[unknown user]
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Added Creator Sandra Elder
August 11, 2022 08:49
by
sle34
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Added
High-entropy polymer produces a giant electrocaloric effect at low fields.pdf
August 11, 2022 08:51
by
sle34
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August 11, 2022 08:52
by
sle34
Description
- More than a decade of research on the electrocaloric (EC) effect has resulted in EC materials and EC multilayer chips that satisfy a minimum EC temperature change of 5 K required for caloric heat pumps(1-3). However, these EC temperature changes are generated through the application of high electric fields(4-8) (close to their dielectric breakdown strengths), which result in rapid degradation and fatigue of EC performance. Here we report a class of EC polymer that exhibits an EC entropy change of 37.5 J kg(-1) K-1 and a temperature change of 7.5 K under 50 MV m(-1), a 275% enhancement over the state-of-the-art EC polymers under the same field strength. We show that converting a small number of the chlorofluoroethylene groups in poly(vinylidene fluoride-trifluoroethylenechlorofluoroethylene) terpolymer into covalent double bonds markedly increases the number of the polar entities and enhances the polar-nonpolar interfacial areas of the polymer. The polar phases in the polymer adopt a loosely correlated, high-entropy state with a low energy barrier for electric-field-induced switching. The polymer maintains performance for more than one million cycles at the low fields necessary for practical EC cooling applications, suggesting that this strategy may yield materials suitable for use in caloric heat pumps.
Publication Date
License
- https://rightsstatements.org/page/InC/1.0/
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Published
August 11, 2022 08:52
by
sle34
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August 16, 2022 15:52
by
xzx1
Acknowledgments
- Author list: Xiaoshi Qian, Donglin Han, Lirong Zheng, Jie Chen, Madhusudan Tyagi, Qiang Li, Feihong Du, Shanyu Zheng, Xingyi Huang, Shihai Zhang, Junye Shi, Houbing Huang, Xiaoming Shi, Jiangping Chen, Hancheng Qin, Jerzy Bernholc, Xin Chen, Long-Qing Chen, Liang Hong & Q. M. Zhang
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Updated
Publisher, Publisher Identifier (DOI), Publication Date, and 1 more
Show Changes
September 02, 2023 14:21
by
avs5190
Publisher
Publisher Identifier (DOI)
- https://doi.org/10.1038/s41586-021-04189-5
Publication Date
Publisher's Statement
More than a decade of research on the electrocaloric (EC) effect has resulted in EC materials and EC multilayer chips that satisfy a minimum EC temperature change of 5 K required for caloric heat pumps(1-3). However, these EC temperature changes are generated through the application of high electric fields(4-8) (close to their dielectric breakdown strengths), which result in rapid degradation and fatigue of EC performance. Here we report a class of EC polymer that exhibits an EC entropy change of 37.5 J kg(-1) K-1 and a temperature change of 7.5 K under 50 MV m(-1), a 275% enhancement over the state-of-the-art EC polymers under the same field strength. We show that converting a small number of the chlorofluoroethylene groups in poly(vinylidene fluoride-trifluoroethylenechlorofluoroethylene) terpolymer into covalent double bonds markedly increases the number of the polar entities and enhances the polar-nonpolar interfacial areas of the polymer. The polar phases in the polymer adopt a loosely correlated, high-entropy state with a low energy barrier for electric-field-induced switching. The polymer maintains performance for more than one million cycles at the low fields necessary for practical EC cooling applications, suggesting that this strategy may yield materials suitable for use in caloric heat pumps.
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September 02, 2023 14:24
by
avs5190
Acknowledgments
Author list: Xiaoshi Qian, Donglin Han, Lirong Zheng, Jie Chen, Madhusudan Tyagi, Qiang Li, Feihong Du, Shanyu Zheng, Xingyi Huang, Shihai Zhang, Junye Shi, Houbing Huang, Xiaoming Shi, Jiangping Chen, Hancheng Qin, Jerzy Bernholc, Xin Chen, Long-Qing Chen, Liang Hong & Q. M. Zhang
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Deleted Creator Sandra Elder
September 02, 2023 14:24
by
avs5190
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Added Creator Xiaoshi Qian
September 02, 2023 14:24
by
avs5190
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Added Creator Donglin Han
September 02, 2023 14:24
by
avs5190
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Added Creator Lirong Zheng
September 02, 2023 14:24
by
avs5190
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Added Creator Jie Chen
September 02, 2023 14:24
by
avs5190
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Added Creator Madhusudan Tyagi
September 02, 2023 14:24
by
avs5190
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Added Creator Qiang Li
September 02, 2023 14:24
by
avs5190
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Added Creator Feihong Du
September 02, 2023 14:24
by
avs5190
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Added Creator Shanyu Zheng
September 02, 2023 14:24
by
avs5190
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Added Creator Xingyi Huang
September 02, 2023 14:24
by
avs5190
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Added Creator Shihai Zhang
September 02, 2023 14:24
by
avs5190
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Added Creator Junye Shi
September 02, 2023 14:24
by
avs5190
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Added Creator Houbing Huang
September 02, 2023 14:24
by
avs5190
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Added Creator Xiaoming Shi
September 02, 2023 14:24
by
avs5190
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Added Creator Jiangping Chen
September 02, 2023 14:24
by
avs5190
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Added Creator Hancheng Qin
September 02, 2023 14:24
by
avs5190
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Added Creator Jerzy Bernholc
September 02, 2023 14:24
by
avs5190
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Added Creator Xin Chen
September 02, 2023 14:24
by
avs5190
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Added Creator Long-Qing Chen
September 02, 2023 14:24
by
avs5190
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Added Creator Liang Hong
September 02, 2023 14:24
by
avs5190
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Added Creator Q. M. Zhang
September 02, 2023 14:24
by
avs5190
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Updated
April 04, 2024 10:21
by
[unknown user]