Precipitation-Printed High-β Phase Poly(vinylidene fluoride) for Energy Harvesting
Precipitation-Printed High-β Phase Poly(vinylidene fluoride) for Energy Harvesting
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DOI：
10.1021/acsami.0c16207
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发表时间：
2020-12-30
影响因子：
9.5
通讯作者：
Sodano, Henry A.
中科院分区：
文献类型：
--
作者：
Tu, Ruowen;Sprague, Ethan;Sodano, Henry A.
聚偏氟乙烯（PVDF）具有优异的压电性能，使其成为一种功能材料。PVDF是一种半结晶聚合物，通过促进极性β相来提高PVDF的压电性能是其研究的重点。在这项研究中，沉淀打印被证明是一种可扩展和可定制的方法，可以用高β相PVDF增材制造复杂的大块3D压电能量收集器。通过沉淀印刷，PVDF的β相分数提高到60%，相对于溶剂铸造的PVDF薄膜，产量提高了200%以上。一旦对沉淀打印的PVDF进行热压以减少内部孔隙率，就会观察到显著的铁电响应，其矫顽力场为98 MV m(-1)，最大残余极化为3.2 mu C cm（-2）。此外，测得印刷PVDF和热压PVDF的压电d（33）和d（31）系数分别为-6.42和1.95 pcn -1。对于能量收集应用，拉伸d（31）模式能量收集器被证明可以产生高达717 μ W cm（-3）的功率密度，而带有嵌入式d（33）模式能量收集的打印足跟鞋垫在使用3分钟时能够成功地将32.2 μ J存储到电容器中。因此，沉淀打印为生产高相PVDF和大块压电能量收集器提供了一种新的方法，具有几何复杂、制造简单和低成本的优点。
Poly(vinylidene fluoride) (PVDF) possesses outstanding piezoelectric properties, which allows it to be utilized as a functional material. Being a semicrystalline polymer, enhancing the piezoelectric properties of PVDF through the promotion of the polar beta phase is a key research focus. In this research, precipitation printing is demonstrated as a scalable and tailorable approach to additively manufacture complex and bulk 3D piezoelectric energy harvesters with high-beta phase PVDF. The beta-phase fraction of PVDF is improved to 60% through precipitation printing, yielding more than 200% improvement relative to solvent-cast PVDF films. Once the precipitation-printed PVDF is hot-pressed to reduce internal porosity, a significant ferroelectric response with a coercive field of 98 MV m(-1) and a maximum remnant polarization of 3.2 mu C cm(-2) is observed. Moreover, the piezoelectric d(33) and d(31) coefficients of printed then hot-pressed PVDF are measured to be -6.42 and 1.95 pC N-1, respectively. For energy-harvesting applications, a stretching d(31)-mode energy harvester is demonstrated to produce a power density of up to 717 mu W cm(-3), while a printed full-scale heel insole with embedded d(33)-mode energy harvesting is capable of successfully storing 32.2 mu J into a capacitor when used for 3 min. Therefore, precipitation printing provides a new method for producing high-beta phase PVDF and bulk piezoelectric energy harvesters with the advantages of achieving geometry complexity, fabrication simplicity, and low cost.