Electrode and electrolyte configurations for low frequency motion energy harvesting based on reverse electrowetting.
Electrode and electrolyte configurations for low frequency motion energy harvesting based on reverse electrowetting.
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DOI：
10.1038/s41598-021-84414-3
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发表时间：
2021-03-03
影响因子：
4.6
通讯作者：
Mahbub I
中科院分区：
文献类型：
--
作者：
Adhikari PR;Tasneem NT;Reid RC;Mahbub I
对自供电可穿戴传感器的需求不断增长，迫切需要开发能够可靠且充足地为这些设备供电的能量收集系统。在过去的十年中，基于反向电润湿电介质（REWOD）的机械运动能量收集技术得到了发展，其中电解质在外部施加的机械力的作用下在两个不同的电极之间进行调制（反复挤压）以产生交流电流。在这项工作中，我们探索了电解质浓度、电介质和电介质厚度的各种组合，以利用 REWOD 能量收集器产生最大输出功率。为了实现完全自供电的可穿戴传感器，采用了“零施加偏置电压”方法。使用三种不同浓度的氯化钠水溶液（氯化钠-0.1 M、氯化钠-0.5 M 和氯化钠-1.0 M）作为电解质。同样，电极采用三种不同电介质厚度（100 nm、150 nm 和 200 nm）的 Al2O3 和 SiO2 制成，并附加一层 CYTOP 以实现表面疏水性。 REWOD 能量采集器及其电极电解质层使用集总组件进行建模，其中包括电阻器、电容器和代表采集器的电流源。在不使用任何外部偏置电压的情况下，在具有最佳外部负载的 3 Hz 外部激励频率下，展示了功率密度为 53.3 nW/cm2 的交流电流生成。使用推导的理论模型对实验结果进行了分析验证。与之前报道的作品相比，收割机在品质因数方面表现出优越的性能。这项工作的新颖性在于分析建模方法和实验验证的结合，可以用来广泛增加 REWOD 收集的功率，而不需要任何外部偏置电压。
Increasing demand for self-powered wearable sensors has spurred an urgent need to develop energy harvesting systems that can reliably and sufficiently power these devices. Within the last decade, reverse electrowetting-on-dielectric (REWOD)-based mechanical motion energy harvesting has been developed, where an electrolyte is modulated (repeatedly squeezed) between two dissimilar electrodes under an externally applied mechanical force to generate an AC current. In this work, we explored various combinations of electrolyte concentrations, dielectrics, and dielectric thicknesses to generate maximum output power employing REWOD energy harvester. With the objective of implementing a fully self-powered wearable sensor, a “zero applied-bias-voltage” approach was adopted. Three different concentrations of sodium chloride aqueous solutions (NaCl-0.1 M, NaCl-0.5 M, and NaCl-1.0 M) were used as electrolytes. Likewise, electrodes were fabricated with three different dielectric thicknesses (100 nm, 150 nm, and 200 nm) of Al2O3 and SiO2 with an additional layer of CYTOP for surface hydrophobicity. The REWOD energy harvester and its electrode–electrolyte layers were modeled using lumped components that include a resistor, a capacitor, and a current source representing the harvester. Without using any external bias voltage, AC current generation with a power density of 53.3 nW/cm2 was demonstrated at an external excitation frequency of 3 Hz with an optimal external load. The experimental results were analytically verified using the derived theoretical model. Superior performance of the harvester in terms of the figure-of-merit comparing previously reported works is demonstrated. The novelty of this work lies in the combination of an analytical modeling method and experimental validation that together can be used to increase the REWOD harvested power extensively without requiring any external bias voltage.
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影响因子：
3.9
作者：
Helseth, L. E.;Guo, X. D.
通讯作者：
Guo, X. D.
影响因子：
4.6
作者：
Huynh DH;Nguyen TC;Nguyen PD;Abeyrathne CD;Hossain MS;Evans R;Skafidas E
通讯作者：
Skafidas E
影响因子：
9.5
作者：
Mibus, Marcel;Zangari, Giovanni
通讯作者：
Zangari, Giovanni
影响因子：
1.6
作者：
Khosa, R. Y.;Thorsteinsson, E. B.;Sveinbjornsson, E. O.
通讯作者：
Sveinbjornsson, E. O.
DOI：
10.3390/s110605561
发表时间：
2011
期刊：
Sensors (Basel, Switzerland)
影响因子：
--
作者：
Darwish A;Hassanien AE
通讯作者：
Hassanien AE