Modeling contact electrification in triboelectric impact oscillators as energy harvesters
Modeling contact electrification in triboelectric impact oscillators as energy harvesters
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DOI：
10.1117/12.2513949
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发表时间：
2019-03
期刊：
影响因子：
--
通讯作者：
H. Tao;Gregory S. Batt;J. Gibert
中科院分区：
文献类型：
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作者：
H. Tao;Gregory S. Batt;J. Gibert
摩擦电能量采集器或纳米发电机利用接触起电和静电感应来消除来自机械结构的随机运动的多余能量。本研究的重点是在接触-分离碰撞振子配置的摩擦电能量采集器的建模。虽然在这样的系统中的机械和静电元素可以令人满意地基于现有的理论建模，接触带电的基本物理仍在争论中。通过实验研究接触起电过程中冲击力与电荷转移之间的关系，将介质层表面电荷密度作为变量引入摩擦电冲击振子的宏观运动方程中。具体地，将具有选定材料对的试样置于螺线管驱动的压力测试仪下，该测试仪用垂直力对试样充电，该垂直力的大小、频率和占空比可以控制。静电计用于监测电极之间的短路电荷流，从中可以提取电介质层上的电荷积累。通过参数扫描测试的结果，可以通过曲线拟合或插值将从接触力到表面电荷密度的映射整合到运动方程中。
Triboelectric energy harvesters or nanogenerators exploit both contact electrification and electrostatic induction to scavenge excess energy from random motions of mechanical structures. This study focuses on the modeling of triboelectric energy harvesters in the configuration of contact-separation impact oscillators. While mechanical and electrostatic elements in such systems can be satisfactorily modeled based on existing theories, the underlying physics of contact electrification is still under debate. The aim of this work is to introduce the surface charge density of dielectric layers as a variable into the macroscopic equations of motion of triboelectric impact oscillators by experimentally investigating the relation between the impact force and the charge transfer during contact electrification. Specifically, specimens with selected pairs of materials are put under a solenoid-driven pressing tester which charges the specimens with a vertical force whose magnitude, frequency and duty cycle can be controlled. An electrometer is used to monitor the short circuit charge ow between the electrodes from which the charge accumulation on dielectric layers can be extracted. With results from parameter-sweep tests, the produced map from contact force to surface charge density can be integrated into equations of motion via curve fitting or interpolation.