Wang Chenwei, Gao Xin, Zheng Mupeng, Zhu Mankang, Hou Yudong
Key Laboratory of Advanced Functional Materials, Ministry of Education, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China.
ACS Appl Mater Interfaces. 2021 Sep 8;13(35):41735-41743. doi: 10.1021/acsami.1c12197. Epub 2021 Aug 30.
The rapid development of flexible micropower electronics has aided the opportunity for the broader application of flexible piezoelectric composites (PCs) but has also led to higher requirements for their power generation. Among them, 0-3 PCs with embedded zero-dimension piezoparticle fillers, although low cost and easy to prepare, suffer from suboptimal output performance because of inherent structural defects. In this work, the voltage output was increased from 3.4 to 12.7 V under a force of 7 N, through first-step regulation by aligning the KNbO (KN) particles in the polydimethylsiloxane (PDMS) matrix; then, a significantly enhanced current output (from 0.7 to 4.5 μA) through second-step regulation by introducing copper nanorods (Cu NRs) interspersed in the gaps between the KN chains. Consequently, the proposed PC exhibits much higher power density, 37.3 μW/cm, than that of random KN/PDMS and thus shows good potential for high-performance, flexible piezoelectric energy harvesters.
柔性微功率电子学的快速发展为柔性压电复合材料（PCs）的更广泛应用提供了契机，但也对其发电提出了更高要求。其中，嵌入零维压电颗粒填料的0-3型PCs，尽管成本低且易于制备，但由于固有结构缺陷，其输出性能欠佳。在这项工作中，通过在聚二甲基硅氧烷（PDMS）基体中使铌酸钾钠（KN）颗粒取向进行第一步调控，在7 N的力作用下，电压输出从3.4 V提高到了12.7 V；然后，通过引入穿插在KN链间隙中的铜纳米棒（Cu NRs）进行第二步调控，电流输出显著增强（从0.7 μA提高到4.5 μA）。因此，所提出的PC表现出比随机分布的KN/PDMS更高的功率密度，即37.3 μW/cm²，从而显示出在高性能柔性压电能量采集器方面具有良好的潜力。
