Piezoelectric energy harvesters (PEHs) have attracted significant attention with the ability of converting mechanical energy into electrical energy and power the self-powered microelectronic components. Generally, material's superior energy harvesting performance is closely related to its high transduction coefficient (×), which is dependent on higher piezoelectric coefficient and lower dielectric constant of materials. However, the high and low are difficult to be simultaneously achieved in piezoelectric ceramics. Herein, lead zirconate titanate (PZT) based piezoelectric composites with vertically aligned microchannel structure are constructed by phase-inversion method. The polyvinylidene fluoride (PVDF) and carbon nanotubes (CNTs) are mixed as fillers to fabricate PZT/PVDF&CNTs composites. The unique structure and uniformly distributed CNTs network enhance the polarization and thus improve the . The PVDF filler effectively reduce the . As a consequence, the excellent piezoelectric coefficient ( = 595 pC/N) and relatively low dielectric constant ( = 1,603) were obtained in PZT/PVDF&CNTs composites, which generated an ultra-high × of 24,942 × 10 m/N. Therefore, the PZT/PVDF&CNTs piezoelectric composites achieve excellent energy harvesting performance (output voltage: 66 V, short current: 39.22 μA, and power density: 1.25 μW/mm). Our strategy effectively boosts the performance of piezoelectric-polymer composites, which has certain guiding significance for design of energy harvesters.

中文翻译：

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3D垂直排列微通道结构增强PZT/PVDF&CNT压电复合材料的压电能量收集性能


压电能量收集器（PEH）因其能够将机械能转换为电能并为自供电微电子元件供电的能力而引起了广泛关注。一般来说，材料优异的能量收集性能与其高传导系数（×）密切相关，而高传导系数取决于材料较高的压电系数和较低的介电常数。然而，高低在压电陶瓷中很难同时实现。在此，通过相转化方法构建了具有垂直排列微通道结构的锆钛酸铅（PZT）基压电复合材料。将聚偏氟乙烯 (PVDF) 和碳纳米管 (CNT) 作为填料混合，制备 PZT/PVDF&CNTs 复合材料。独特的结构和均匀分布的碳纳米管网络增强了极化，从而提高了。 PVDF填料有效降低了。因此，PZT/PVDF&CNTs 复合材料获得了优异的压电系数 (= 595 pC/N) 和相对较低的介电常数 (= 1,603)，产生了 24,942 × 10 m/N 的超高倍率。因此，PZT/PVDF&CNTs压电复合材料具有优异的能量收集性能（输出电压：66 V，短时电流：39.22 μA，功率密度：1.25 μW/mm）。我们的策略有效提高了压电聚合物复合材料的性能，对能量收集器的设计具有一定的指导意义。