Electrode Effects on Flexible and Robust Polypropylene Ferroelectret Devices for Fully Integrated Energy Harvesters
Electrode Effects on Flexible and Robust Polypropylene Ferroelectret Devices for Fully Integrated Energy Harvesters
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DOI：
10.1021/acsami.0c02019
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发表时间：
2020-05-20
影响因子：
9.5
通讯作者：
Sepulveda, Nelson
中科院分区：
文献类型：
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作者：
Pastrana, Juan;Dsouza, Henry;Sepulveda, Nelson
本工作对聚丙烯铁电驻极体纳米发电机的电极界面进行了表征研究。重点对碳纳米管纤维电极和传统的金属薄膜电极进行了比较。在具有相同电极尺寸的样品上针对一系列施加的压力进行多个实验。结果表明，较高的开路电压峰值的薄膜金属电极，无论施加的压力。有趣的是，金属和碳纳米管基纤维电极之间的短路电流值差异并不显著。通过用丙酮对碳纳米管纤维进行后处理并将结果与未处理的碳纳米管膜电极和薄膜金属电极进行比较，进一步研究了碳纳米管纤维电极。为了实现铁电驻极体能量收集器与柔性能量存储元件的单片集成，这项工作还提出了对柔性铁电驻极体能量收集器的电极中的感应自由电荷的产生和泄漏的研究。结果表明，在聚丙烯薄膜中，通过寄生元件的电流泄漏是一个比偶极子弛豫更快的过程。最后，电极可靠性研究表明，在单次折叠后，具有金属薄膜电极的器件的电输出没有显著差异，但在起皱后显示出显著劣化;同时，这些过程对具有碳纳米管纤维基电极的类似器件的性能没有影响。
This work presents a characterization study of the electrode interface in polypropylene ferroelectret nanogenerators. An emphasis is made on the comparison of carbon nanotube fiber electrodes with traditional metallic thin film electrodes. Multiple experiments were performed on samples with the same electrode dimensions for a range of applied pressures. Results showed higher open-circuit voltage peak values for the thin film metal electrodes, regardless of the applied pressure. Interestingly, the difference in short-circuit current values between metal and carbon nanotube-based fiber electrodes was not as significant. The carbon nanotube fiber electrode was further investigated by post-treating the fiber with acetone and comparing the results with untreated carbon nanotube film electrodes and thin film metal electrodes. In an effort to enable a monolithic integration of ferroelectret energy harvesters with flexible energy storage elements, this work also presents studies on generation and leakage of induced free charge in the electrodes of flexible ferroelectret energy harvesters. It was found the current leakage through parasitic elements is a faster process than dipole relaxation in the polypropylene film. Finally, an electrode reliability study shows no significant difference in the electrical output of the devices with metallic thin film electrodes after single folding but shows a significant deterioration after crumpling; meanwhile, these processes had no effect on the performance of similar devices with carbon nanotube fiber-based electrodes.