Colossal electrocaloric effect in an interface-augmented ferroelectric polymer

• 成果类型: Article
• 署名作者: Zheng, Shanyu; Du, Feihong; Zheng, Lirong; Han, Donglin; Li, Qiang; Shi, Junye; Chen, Jiangping; Shi, Xiaoming; Huang, Houbing; Luo, Yaorong; Yang, Yurong; O'Reilly, Padraic; Wei, Linlin; de Souza, Nicolas; Hong, Liang; Qian, Xiaoshi
• 署名单位: Shanghai Jiao Tong University; Shanghai Jiao Tong University; Shanghai Jiao Tong University; Shanghai Jiao Tong University; Beijing Institute of Technology; Beijing Institute of Technology; Nanjing University; Collaborative Innovation Center of Advanced Microstructures (CICAM); Nanjing University; Australian Nuclear Science & Technology Organisation; Shanghai Jiao Tong University
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-12895
• DOI: 10.1126/science.adi7812
• 发表日期: 2023-12-01
• 页码: 1020-1026
• 关键词: temperature-range; efficient; phase; nanocomposites; copolymers; devices; films

摘要

The electrocaloric effect demands the maximized degree of freedom (DOF) of polar domains and the lowest energy barrier to facilitate the transition of polarization. However, optimization of the DOF and energy barrier-including domain size, crystallinity, multiconformation coexistence, polar correlation, and other factors in bulk ferroelectrics-has reached a limit. We used organic crystal dimethylhexynediol (DMHD) as a three-dimensional sacrificial master to assemble polar conformations at the heterogeneous interface in poly(vinylidene fluoride)-based terpolymer. DMHD was evaporated, and the epitaxy-like process induced an ultrafinely distributed, multiconformation-coexisting polar interface exhibiting a giant conformational entropy. Under a low electric field, the interface-augmented terpolymer had a high entropy change of 100 J/(kg center dot K). This interface polarization strategy is generally applicable to dielectric capacitors, supercapacitors, and other related applications.