Hybrid organic-inorganic piezoelectrics have received considerable attention in recent years owing to their fascinating performance, facile synthesis, and mechanical flexibility. However, the reported systems usually contain toxic heavy metals or are unstable due to sensitive metal halide bonds in air. In this context, eco-friendly and stable hybrid materials with excellent piezoelectric properties are highly sought after. Here, a new stable zero-dimensional hybrid piezoelectric, [Me-V]₃Mn(SCN)₅ (Me-V, 1-methyl-[4,4′]-bipyridinium), based on a pseudo-halogen environmentally friendly anion of SCN⁻ was synthesized. More importantly, the mechanical energy harvesting properties of its flexible composite films, [Me-V]₃Mn(SCN)₅/PBAT (PBAT, polybutylene adipate terephthalate), with a series of weight ratios (1, 5, 10, 15, and 20 wt%) of [Me-V]₃Mn(SCN)₅ are reported. Experimental results demonstrate that the 15 wt% [Me-V]₃Mn-(SCN)₅/PBAT devices present an exceptional performance in energy harvesting, which can produce a maximum output voltage of 18.49 V and a power density of 7.88 µW cm⁻² under an applied force of only 0.03 MPa, catching up with those of the state-of-the-art piezoelectric energy harvesting devices. Meanwhile, a typical device was demonstrated to exhibit excellent mechanical durability under 5500 cycles and environmentally stable over 60 days. Furthermore, the devices also show good sensitivity in monitoring human body motions, including finger tapping, wrist and elbow bending, and foot stepping. This work proves that lead- and halide-free hybrid piezoelectrics can serve as eco-friendly materials for flexible sensing and energy harvesting.

近年来，有机-无机杂化压电材料由于其出色的性能、简便的合成和机械灵活性而受到广泛关注。然而，报道的系统通常含有有毒重金属或由于空气中敏感的金属卤化物键而不稳定。在此背景下，具有优异压电性能的环保、稳定的杂化材料备受追捧。在这里，一种新的稳定的零维混合压电，[Me-V] ₃ Mn(SCN) ₅ (Me-V, 1-methyl-[4,4']-bipyridinium)，基于假卤素环保阴离子SCN ^-被合成。更重要的是，其柔性复合薄膜 [Me-V] ₃ Mn(SCN)的机械能量收集特性_{5 /PBAT（PBAT，聚己二酸对苯二甲酸丁二醇酯）具有一系列 [Me-V] 3} Mn(SCN) ₅重量比（1、5、10、15 和 20 wt%）。实验结果表明，15 wt% [Me-V] ₃ Mn-(SCN) ₅ /PBAT 器件在能量收集方面表现出卓越的性能，可产生 18.49 V 的最大输出电压和 7.88 µW cm 的功率密度^{- 2个}在仅 0.03 MPa 的作用力下，赶上了最先进的压电能量收集装置。同时，一个典型的设备被证明在 5500 次循环下表现出出色的机械耐久性和超过 60 天的环境稳定性。此外，这些设备在监测人体运动方面也表现出良好的灵敏度，包括手指敲击、手腕和肘部弯曲以及足部踏步。这项工作证明，无铅和无卤化物的混合压电材料可以作为用于灵活传感和能量收集的环保材料。