Bitna Bae , Nagamalleswara Rao Alluri , Cheol Min Kim , Jungho Ryu , Gwang Hyeon Kim , Hyeon Jun Park , Changyeon Baek , Min-Ku Lee , Gyoung-Ja Lee , Geon-Tae Hwang , Kwi-Il Park
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引用次数: 0
摘要
柔性磁电（ME）发电机在可穿戴设备和物联网（IoT）设备中的广泛应用引起了人们的极大兴趣。0-3 型 ME 复合薄膜要实现高能量转换性能，关键在于防止填料在聚合物基体中聚集，并充分发挥填料固有特性的潜力。为了实现高性能，我们将磁致伸缩 CoFe2O4-BaTiO3 核壳（CBCS）填料均匀分布在压电聚偏氟乙烯（PVDF）聚合物中，制备出了一种柔性 ME 复合薄膜。通过优化 CBCS 的壳厚度和最大化 BaTiO3 壳-PVDF 界面区域的电活性 β 相，ME 复合薄膜产生了更高的能量转换效率。观察到的薄膜 ME 系数高达 710 mV/cm∙Oe。基于有限元分析的多物理场模拟研究了 BaTiO3 壳厚度对 ME 薄膜性能的影响。这项研究为在 ME 复合薄膜中实现更高的填料含量以开发高效、灵活的 ME 发电机铺平了道路，从而为环保型永久电源提供了可能。
CoFe2O4-BaTiO3 core-shell-embedded flexible polymer composite as an efficient magnetoelectric energy harvester
Flexible magnetoelectric (ME) generators gained immense interest due to the broad applications in wearable and Internet of Things (IoT)-based devices. The key to achieving high energy conversion performance of 0–3 type ME composite films is the prevention of filler aggregation in the polymer matrix and accessing the full potential of intrinsic properties of filler. To achieve high performance, a flexible ME composite film was fabricated by homogeneous distribution of magnetostrictive CoFe2O4-BaTiO3 core-shell (CBCS) fillers into piezoelectric polyvinylidene fluoride (PVDF) polymer. The ME composite film generates an enhanced energy conversion efficiency by optimizing the shell thickness of CBCS and maximizing the electroactive β-phase at the BaTiO3 shell-PVDF interfacial region. The observed ME coefficient of the film reached up to 710 mV/cm∙Oe. Multiphysics simulations based on the finite element analysis were adopted to investigate the role of BaTiO3 shell thickness on the performance of ME film. This study paves the way to achieve higher filler loading content in the ME composite films to develop an efficient, flexible ME generator for eco-friendly permanent power sources.
期刊介绍：
Materials Today Physics is a multi-disciplinary journal focused on the physics of materials, encompassing both the physical properties and materials synthesis. Operating at the interface of physics and materials science, this journal covers one of the largest and most dynamic fields within physical science. The forefront research in materials physics is driving advancements in new materials, uncovering new physics, and fostering novel applications at an unprecedented pace.
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