Abdullahi Hassan Yusuf, Chen Lei, Geng Xinwei, Jiang Zheye, Zhang Fan, Luo Shibin, Hu Hailong
School of Aeronautics and Astronautics, Central South University, Changsha 410083, China.
Research Center in Intelligent Thermal Structures for Aerospace, Central South University, Changsha 410083, China.
ACS Appl Mater Interfaces. 2021 Oct 6;13(39):46681-46693. doi: 10.1021/acsami.1c13614. Epub 2021 Sep 21.
To successfully complete the design of high-performance electrocaloric devices for advanced flexible cooling systems, it is necessary to comprehensively consider the optimization of composite materials, structural design of nanocomposites, and device integration. The cooling power density and energy storage density of various structural configurated poly(vinylidene fluoride) (PVDF)-based polymer nanocomposites are investigated using a phase-field model through the general formulation of a partial differential equation of COMSOL Multiphysics and finite element analysis through Maxwell's equation of conservation of charge. It is revealed that ferroelectric polymer nanocomposites composed of boron nitrate fibers (BN) + BCZT@BaTiO + PVDF possess the optimal result regarding their cooling power as well as the energy storage density. The cooling power density of the core-shell-structured BN + BCZT@BaTiO + PVDF nanocomposites is evaluated as a function of the volume content, frequency, and electric field, where a remarkable cooling power density of 162.2 W/cm is achieved at 4 Hz with energy storage density of 33.4 J/cm under a 500 MV/m field. Therefore, by performing the systematic study of the electrocaloric effect in structural configurated ferroelectric polymer nanocomposites for solid-state refrigeration, this opens an avenue for developing remarkably improved power density with reduced weight in aerospace energy storage technology.
为成功完成用于先进柔性冷却系统的高性能电热装置的设计，有必要全面考虑复合材料的优化、纳米复合材料的结构设计以及装置集成。通过COMSOL Multiphysics偏微分方程的一般公式，利用相场模型并通过麦克斯韦电荷守恒方程进行有限元分析，研究了各种结构配置的聚偏氟乙烯（PVDF）基聚合物纳米复合材料的冷却功率密度和储能密度。结果表明，由硝酸硼纤维（BN）+ BCZT@BaTiO + PVDF组成的铁电聚合物纳米复合材料在冷却功率和储能密度方面具有最佳结果。评估了核壳结构的BN + BCZT@BaTiO + PVDF纳米复合材料的冷却功率密度与体积含量、频率和电场的函数关系，在500 MV/m的电场下，在4 Hz时实现了162.2 W/cm的显著冷却功率密度，储能密度为33.4 J/cm。因此，通过对用于固态制冷的结构配置铁电聚合物纳米复合材料中的电热效应进行系统研究，这为在航空航天储能技术中开发显著提高功率密度且减轻重量开辟了一条途径。
