Contact Electrification and Energy Harvesting Using Periodically Contacted and Squeezed Water Droplets
Contact Electrification and Energy Harvesting Using Periodically Contacted and Squeezed Water Droplets
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DOI：
10.1021/la503494c
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发表时间：
2015-03-17
期刊：
影响因子：
3.9
通讯作者：
Guo, X. D.
中科院分区：
文献类型：
--
作者：
Helseth, L. E.;Guo, X. D.
我们研究了当停留在金属电极上的小水滴周期性地与氟化乙丙橡胶疏水膜接触时发生的接触带电。结果表明，最大电流与液滴体积成幂函数关系。接触电流形成的时间尺度与液滴扩散所需的时间一致，因此比形成双电层所需的时间要长。向水中加入盐确实会减少接触电流，但不是完全减少，这表明任何剩余的水层都不能完全中和接触时产生的电荷。在平均功率为0.7微瓦，峰值功率接近5微瓦、频率为5赫兹的情况下，一滴200亩的L水滴就可以用来点亮发光二极管。
We investigate the contact electrification occurring when a small water droplet resting on a metal electrode is brought periodically in contact with a hydrophobic film of fluorinated ethylene propylene. It is found that the maximum current increases with the drop volume according to a power law. The time scale for the contact current to develop is consistent with that required for a droplet to spread and is, therefore, longer than the time required to form the electric double layer. Adding salt into the water does reduce the contact current but not entirely, which suggests that any remaining water layer cannot entirely neutralize the charges developed upon contact. With an average power of 0.7 mu W and a peak power near 5 mu W at a frequency of 5 Hz, a 200 mu L droplet of pure water can be used to light up a light-emitting diode.