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High-entropy polymer produces a giant electrocaloric effect at low fields.
Qian, Xiaoshi; Han, Donglin; Zheng, Lirong; Chen, Jie; Tyagi, Madhusudan; Li, Qiang; Du, Feihong; Zheng, Shanyu; Huang, Xingyi; Zhang, Shihai; Shi, Junye; Huang, Houbing; Shi, Xiaoming; Chen, Jiangping; Qin, Hancheng; Bernholc, Jerzy; Chen, Xin; Chen, Long-Qing; Hong, Liang; Zhang, Q M.
  • Qian X; Institute of Refrigeration and Cryogenics, Interdisciplinary Research Centre for Metamaterials and Intelligent Systems, State Key Laboratory of Mechanical System and Vibration, and MOE Key Laboratory for Power Machinery and Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University
  • Han D; Shanghai Jiao Tong University Jiangsu ZhongGuanCun Research Institute, Liyang, Jiangsu, China. xsqian@sjtu.edu.cn.
  • Zheng L; Institute of Refrigeration and Cryogenics, Interdisciplinary Research Centre for Metamaterials and Intelligent Systems, State Key Laboratory of Mechanical System and Vibration, and MOE Key Laboratory for Power Machinery and Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University
  • Chen J; School of Physics and Astronomy, Institute of Natural Sciences, Shanghai National Center for Applied Mathematics (SJTU Center) and MOE-LSC, Shanghai Jiao Tong University, Shanghai, China.
  • Tyagi M; Frontiers Science Center for Transformative Molecules, Department of Polymer Science and Engineering, Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, China.
  • Li Q; NIST Center for Neutron Research, National Institute of Standards and Technology (NIST), Gaithersburg, MD, USA.
  • Du F; Department of Materials Science and Engineering, University of Maryland, College Park, MD, USA.
  • Zheng S; Institute of Refrigeration and Cryogenics, Interdisciplinary Research Centre for Metamaterials and Intelligent Systems, State Key Laboratory of Mechanical System and Vibration, and MOE Key Laboratory for Power Machinery and Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University
  • Huang X; Institute of Refrigeration and Cryogenics, Interdisciplinary Research Centre for Metamaterials and Intelligent Systems, State Key Laboratory of Mechanical System and Vibration, and MOE Key Laboratory for Power Machinery and Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University
  • Zhang S; Institute of Refrigeration and Cryogenics, Interdisciplinary Research Centre for Metamaterials and Intelligent Systems, State Key Laboratory of Mechanical System and Vibration, and MOE Key Laboratory for Power Machinery and Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University
  • Shi J; Frontiers Science Center for Transformative Molecules, Department of Polymer Science and Engineering, Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, China. xyhuang@sjtu.edu.cn.
  • Huang H; PolyK Technologies, State College, PA, USA.
  • Shi X; Institute of Refrigeration and Cryogenics, Interdisciplinary Research Centre for Metamaterials and Intelligent Systems, State Key Laboratory of Mechanical System and Vibration, and MOE Key Laboratory for Power Machinery and Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University
  • Chen J; School of Materials Science and Engineering and Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing, China. hbhuang@bit.edu.cn.
  • Qin H; School of Materials Science and Engineering and Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing, China.
  • Bernholc J; Institute of Refrigeration and Cryogenics, Interdisciplinary Research Centre for Metamaterials and Intelligent Systems, State Key Laboratory of Mechanical System and Vibration, and MOE Key Laboratory for Power Machinery and Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University
  • Chen X; Department of Physics, North Carolina State University, Raleigh, NC, USA.
  • Chen LQ; Department of Physics, North Carolina State University, Raleigh, NC, USA.
  • Hong L; Department of Materials Science and Engineering, Pennsylvania State University, University Park, PA, USA.
  • Zhang QM; Department of Materials Science and Engineering, Pennsylvania State University, University Park, PA, USA.
Nature ; 600(7890): 664-669, 2021 12.
Article en En | MEDLINE | ID: mdl-34937898
ABSTRACT
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 pumps1-3. However, these EC temperature changes are generated through the application of high electric fields4-8 (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-trifluoroethylene-chlorofluoroethylene) 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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Texto completo: 1 Banco de datos: MEDLINE Idioma: En Año: 2021 Tipo del documento: Article
Texto completo
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PubMed Links
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Texto completo: 1 Banco de datos: MEDLINE Idioma: En Año: 2021 Tipo del documento: Article