High power density and bias-free reverse electrowetting energy harvesting using surface area enhanced porous electrodes
High power density and bias-free reverse electrowetting energy harvesting using surface area enhanced porous electrodes
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DOI：
10.1016/j.jpowsour.2021.230726
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发表时间：
2021-11-06
影响因子：
9.2
通讯作者：
Mahbub, Ifana
中科院分区：
文献类型：
--
作者：
Adhikari, Pashupati R.;Reid, Russell C.;Mahbub, Ifana
电介质反向电润湿（REWOD）是一种新颖的能量收集技术，由于其在低频范围内的有效性能并且不需要固体结构的共振频率，因此与其他能量收集技术相比具有显着优势。然而，基于平面电极的 REWOD 能量收集表面积有限，因此功率输出较低。在这项工作中，我们提出了一种通过使用穿孔硅片电极显着增加总可用表面积来增强 REWOD 能量收集器功率输出的新颖方法。在不施加任何外部偏置电压的情况下，对于38μm孔径的电极在5Hz调制频率下测得的每单位平面面积的最大电流和电压密度分别为3.77μA/cm(2)和1.05V/cm(2)。 RMS 功率密度输出为 4.8 mu W/cm(2)，比我们之前在平面电极上的工作高出 23 倍，显示了多孔电极在 REWOD 能量收集中的重要性。开发并论证了验证实验结果的简单电容理论模型。这项工作的新颖性在于将无偏压 REWOD 能量收集方法与单位平面面积电极表面积的显着增强相结合，以提高输出功率密度。
Reverse electrowetting-on-dielectric (REWOD) is a novel energy harvesting technology with a significant advantage over other energy harvesting technologies due to its effective performance at a low-frequency range and not requiring resonance frequency of solid structures. However, REWOD energy harvesting based on planar electrodes has a limited surface area and therefore a lower power output. In this work, we present a novel approach for enhancing power output from a REWOD energy harvester by significantly increasing the total available surface area using perforated silicon wafer electrodes. Without applying any external bias voltage, maximum current and voltage densities per unit planar area were measured to be 3.77 mu A/cm(2) and 1.05 V/cm(2), respectively, for a 38 mu m pore-size electrode at 5 Hz modulation frequency. RMS power density output was 4.8 mu W/cm(2), which is similar to 23 times higher than that from our prior work on planar electrodes showing the significance of porous electrodes in REWOD energy harvesting. A simple capacitive theoretical model validating experimental results was developed and justified. The novelty of this work lies in the combination of a bias-free approach to REWOD energy harvesting coupled with significant enhancement in electrode surface area per planar area to increase the output power density.