High-performance reverse electrowetting energy harvesting using atomic-layer-deposited dielectric film

Yang, Hwichul; Hong, Soonwook; Koo, Bongjun; Lee, Dohaeng; Kim, Young‐Beom

doi:10.1016/j.nanoen.2016.11.006

Cited by 51 publications

(19 citation statements)

References 29 publications

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“…This shows that compared to the total current density output, leakage current is insignificant. The leakage current that occurs in the REWOD energy harvester is because of the fact that the dielectric layer is not a perfect insulator and can be considered a loss term 24 .…”

Section: Resultsmentioning

confidence: 99%

“…Comparisons between amorphous and crystalline thin films have been made to show that crystalline films have grain structure that contributes to a higher leakage current 23 . E-beam evaporation, sputtering, and atomic layer deposition (ALD) have been used to provide dense and uniform dielectric films and hence minimize the leakage current 24 .…”

Section: Introductionmentioning

confidence: 99%

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Electrode and electrolyte configurations for low frequency motion energy harvesting based on reverse electrowetting

Adhikari

Biswas

Reid

et al. 2021

Sci Rep

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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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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrode and electrolyte configurations for low frequency motion energy harvesting based on reverse electrowetting

Adhikari

Biswas

Reid

et al. 2021

Sci Rep

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“…Thus, it is suitable for use with low power and low frequencies. In addition, a wide range of power can be produced without using a separate system 9 – 11 . The use of miniaturized and permanently available energy harvesters instead of batteries could improve environmental problems, and REWOD energy-harvesting technology is of great interest in academia and industry 4 , 12 , 13 .…”

Section: Introductionmentioning

confidence: 99%

Energy harvesting performance of an EDLC power generator based on pure water and glycerol mixture: analytical modeling and experimental validation

Kim

Shim

Kim

2021

Sci Rep

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A liquid droplet oscillating between two plane electrodes was visualized, and the electrical power generation based on the reverse-electrowetting-on-dielectric (REWOD) phenomenon was measured. For the upper plate, a hydrophobic surface treated by PTFE was used, and the lower plate was tested using the hydrophilic surface properties of ITO glass. To analyze the dynamic behavior of an oscillating liquid bridge, a modeling study was carried out using the phase field method based on the finite element method. The dynamic contact angle of the oscillating liquid bridge was modeled based on advancing and receding contact angles. The variable interfacial areas between the liquid and solid surfaces were calculated and agreed well with the experimental results within a 10% error band. Furthermore, experimental and analytical studies were carried out to examine the REWOD energy harvesting characteristics of the glycerol-water mixtures in various concentrations. As a result, the peak voltage output was obtained at a specific concentration of the glycerol mixture, and the power density of the oscillating liquid bridge at this point was up to 2.23 times higher than that of pure water.

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“…Typically, nano-generators are getting famous in the last decade due to the recent advent of Internet-of-Things era with mobile electronic devices [4]. Therefore, different energy nano-generators have been designed such as piezoelectric [5][6][7][8], triboelectric [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27], electric double layer modulation methods [28][29][30][31][32], and reversal of famous electrowetting phenomenon [33][34][35]. It is also known that these methods may provide solutions for the Internet-of-Things devices and limited lifetime of batteries in portable electronics [4].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of the Triboelectrification Using Artificial Surface Charges

et al. 2020

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Triboelectrification is a novel technology to harvest electricity from unexploited environmental energy. Its efficiency depends on the area, morphology and charges on the in-contact surfaces. Many studies are carried out in order to increase the efficiency of the triboelectric generators by increasing the surface area or varying the morphology but the charge density is not properly focused until date. Herein, we will discuss the effect of the artificial charges induced on the in-contact surface. For that purpose, plasma treatment was used to increase the surface charge density of the in-contact surface. The increment in the charge density actually helped us to increase the efficiency of triboelectric generator even without changing the dimensions of the device. The output power was increased up to two folds as compared to the untreated device. At the end, we also charged the capacitor in order to compare the charge storing efficiencies of both devices. We found that the untreated device and the plasma treated device (15 min and 30 min) stored voltages up to 6 V, 9 V and 12 V respectively. This type of study will surely support the researchers to enhance the triboelectric current generation efficiency even without increasing the size of the device.

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High-performance reverse electrowetting energy harvesting using atomic-layer-deposited dielectric film

Cited by 51 publications

References 29 publications

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

Energy harvesting performance of an EDLC power generator based on pure water and glycerol mixture: analytical modeling and experimental validation

Enhancement of the Triboelectrification Using Artificial Surface Charges

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