基于自极化聚偏二氟乙烯的压电能量收集器，具有高度取向的多相结构的β相。,ACS Sustainable Chemistry & Engineering

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基于自极化聚偏二氟乙烯的压电能量收集器，具有高度取向的多相结构的β相。
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-12-22 , DOI: 10.1021/acssuschemeng.0c07802
Jiajun Guo ₁ , Min Nie ₁ , Qi Wang ₁

Affiliation

具有均匀排列的偶极子的自极化聚偏二氟乙烯（PVDF）无需后极化处理即可将机械振动转换为电能，这在自供电的柔性电子产品中引起了人们极大的兴趣。但是，当前的对齐富含β晶体的PVDF的策略存在一些局限性，例如复杂的处理，低生产率等。在此，通过将流动诱导的结晶与多巴胺官能化的碳纳米管（P-CNTs）对取向的稳定作用相结合，通过常规的熔融加工途径制备了具有高度取向的β相的自极化柔性PVDF发生器。分子。在这种情况下，显微注射产生的强烈流场促进了gauche-trans转变和均匀取向，在P-CNT的O–H基团与PVDF的F–C基团之间有很强的相互作用的同时，P-CNT募集并将相邻的短链固定在表面上，从而抑制了分子弛豫。结果，原位培养了具有优先排列特性的丰富的电活性β-相，产生了固有的自定向偶极子。即使没有极化处理，PVDF的非凡压电性能也得到了充分利用，开路电压密度达到了约11 V / cm^{如图2所示}，与通过常规铸造方法制造的随机取向的样品相比，具有超过4倍的改进。最后，通过将手指运动产生的不规则机械能转换为可利用的电能，从而点亮绿色发光二极管，探索了其作为强大的能量收集器的潜在应用。通过简单的熔融加工就可以实现基于流致结晶的从晶体组成到形态的多尺度控制，因此可以适用于大规模连续制造自极化压电PVDF能量收集装置。

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Self-Poling Polyvinylidene Fluoride-Based Piezoelectric Energy Harvester Featuring Highly Oriented β-Phase Structured at Multiple Scales

Self-poling poly(vinylidene fluoride) (PVDF) featuring uniformly aligned dipoles can convert mechanical vibrations into electrical energy without post-poling treatment, which is a topic of intense interest in self-powered flexible electronics. However, the current strategies to align PVDF rich in β-crystals have some limitations, such as complex processing, low productivity, and so on. Herein, a self-poling flexible PVDF generator structured with a highly oriented β-phase was prepared via a normal melt processing pathway, by combining flow-induced crystallization with the stabilizing effect of dopamine-functionalized carbon nanotubes (P-CNTs) on the oriented molecules. In this case, the intense flow field exerted by microinjection facilitated the gauche–trans transition and uniform orientation, while with the help of strong interaction between O–H groups of P-CNTs and F–C groups of PVDF, P-CNTs recruited and immobilized the neighboring short chains onto the surface, suppressing the molecular relaxation. As a result, rich electroactive β-phases with preferential alignment characteristics were cultivated in situ, resulting in intrinsic self-oriented dipoles. The extraordinary piezoelectric properties of the PVDF were fully utilized even without polarization treatment, and the open-circuit voltage density reached ∼11 V/cm², with over 4-fold improvement as compared to that of the randomly oriented sample fabricated by conventional cast method. Finally, the potential application as a robust energy harvester was explored by converting irregular mechanical energy from finger movements into utilizable electric energy, lighting green light-emitting diodes. This multi-scale control from crystalline composition to morphology based on flow-induced crystallization is achieved by simple melt-processing and thus can be suitable for large-scale continuous fabrication of self-poling piezoelectric PVDF energy harvesting devices.

更新日期：2021-01-11

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