Cao Yunqi, Figueroa José, Pastrana Juan J, Li Wei, Chen Zhiqiang, Wang Zhong Lin, Sepúlveda Nelson
Department of Electrical and Computer Engineering , Michigan State University , East Lansing , Michigan 48824 , United States.
Department of Electrical Engineering and Computer Sciences , University of California Berkeley , Berkeley , California 94720 , United States.
ACS Appl Mater Interfaces. 2019 May 15;11(19):17400-17409. doi: 10.1021/acsami.9b02233. Epub 2019 Apr 30.
Applying flexible materials for energy scavenging from ambient mechanical vibrations is a clean energy solution that can help alleviate electrical power demands in portable devices and wearable electronics. This work presents fundamental studies on a flexible ferroelectret polymer with a strong piezoelectric effect and its interface with self-powered and energy storage systems. A single-layered device with a thickness of 80 μm was used for characterizing the device's output voltage, current, transferred charge, and energy conversion efficiency. The potential capability of harvesting mechanical energy and delivering to system load is demonstrated by integrating the device into a fully integrated power management system. The theory for determining the harvested energy that is ultimately delivered to external electronic loads (or stored in a battery) is discussed. The maximum power delivery is found to be for a 600 MΩ load, which results in a device power density of 14.0 W/m for input mechanical forces with a frequency around 2 Hz.
应用柔性材料从环境机械振动中收集能量是一种清洁能源解决方案，有助于缓解便携式设备和可穿戴电子产品中的电力需求。这项工作展示了对具有强压电效应的柔性铁电聚合物及其与自供电和储能系统的界面的基础研究。使用厚度为80μm的单层器件来表征器件的输出电压、电流、转移电荷和能量转换效率。通过将该器件集成到完全集成的电源管理系统中，展示了收集机械能并输送到系统负载的潜在能力。讨论了确定最终输送到外部电子负载（或存储在电池中）的收集能量的理论。发现对于600MΩ的负载，最大功率输出为14.0W/m，对于频率约为2Hz的输入机械力，这导致器件功率密度达到该值。
