Triboelectrification-Induced Large Electric Power Generation from a Single Moving Droplet on Graphene/Polytetrafluoroethylene

Kwak, Sung Soo; Lin, Shisheng; Lee, Jeong‐Hwan; Ryu, Hanjun; Kim, Tae Yun; Zhong, Huikai; Chen, Hongsheng; Kim, Sang Woo

doi:10.1021/acsnano.6b03032

Cited by 205 publications

(156 citation statements)

References 32 publications

(44 reference statements)

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“…1b). 8 Successive drops of 600mM NaCl solution, 5mm in diameter, were let to roll down the graphene surface of the device, which was tilted 60° with respect to the horizontal. Their initial speed on graphene was controlled by the height H ( Fig.…”

Section: Figure 1amentioning

confidence: 99%

“…Notably, a prototype of a novel graphene-based electric generator has recently been invented using a graphene-liquid interface to convert mechanical energy of moving ionic droplets to electric energy; it offers an attractive new scheme for scalable electric power generation. [4][5][6][7][8][9][10][11][12][13][14] In such a device, droplets or waves of an ionic solution moving across graphene supported by an appropriate substrate generate a current in graphene along or opposite to the flow direction. More recently, such effect can also be observed at the aqueous interface with a polymer coated insulator-semiconductor structure.…”

Section: Introductionmentioning

confidence: 99%

“…On the microscopic scale, however, there are still arguments on the underlying mechanism that attracts ions to the solution/graphene interface. 5,8,9,16,17 This current lack of microscopic understanding hinders our ability to optimize and control the performance of such graphenebased energy transducers.…”

Section: Introductionmentioning

confidence: 99%

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Mechanism of Electric Power Generation from Ionic Droplet Motion on Polymer Supported Graphene

Yang

et al. 2018

J. Am. Chem. Soc.

102

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These authors contributed equally to this work. AbstractGraphene-based electric power generation that converts mechanical energy of flow of ionic droplets over the device surface into electricity has emerged as promising candidate for a blue-energy network. Yet the lack of a microscopic understanding of the underlying mechanism has prevented ability to optimize and control the performance of such devices. This requires information on interfacial structure and charging behavior at the molecular level. Here, we use sum-frequency vibrational spectroscopy (SFVS) to probe the interfaces of devices composed of aqueous solution, graphene and supporting polymer substrate. We discover that the surface dipole layer of the polymer is responsible for ion attraction toward and adsorption at the graphene surface that leads to electricity generation in graphene. Graphene itself does not attract ions and only acts as a conducting sheet for the induced carrier transport. Replacing the polymer by an organic ferroelectric substrate could enhance the efficiency and allow switching of the electricity generation. Our microscopic understanding

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Section: Figure 1amentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanism of Electric Power Generation from Ionic Droplet Motion on Polymer Supported Graphene

Yang

et al. 2018

J. Am. Chem. Soc.

102

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“…Remarkably, the energy conversion efficiency (Figure S12, Supporting Information) of GHEG is up to 52% due to almost no heat loss, mechanical movement, or byproduced pollutant. Furthermore, GHEG has stable performance when ionic solution with different concentrations are used as moisture source . However, the increase in the concentration of organic solvents in the moisture source leads to a decrease in performance, indicating that the favorable electricity generation ability of GHEG is triggered by water in moisture (Figure S13, Supporting Information).…”

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confidence: 99%

Rollable, Stretchable, and Reconfigurable Graphene Hygroelectric Generators

et al. 2018

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has been effectively utilized to generate considerable power, attracting the increasing attention because of the ubiquitous water molecules migration behavior in nature. [11][12][13][14][15] In this regard, we and others have designed and constructed various moisture-triggered electric generators to convert the chemical potential energy of moisture diffusion into useful electric energy. [14][15][16] The electricity generation process on these newly developed hygroelectric generator (HEG) devices is efficient and clean without much heat loss, mechanical movement, or byproduced pollutant. [10,16] However, the monotonous structure and poor mechanical properties of these devices have extremely restricted their portable applications in complex and mutable conditions. Meanwhile, the systematical integration of well-arranged generator units on a large scale is severely difficult and waiting for proper processing strategies. Graphene oxide (GO) possesses abundant oxygencontaining groups (e.g., COOH) and high specific surface area, allowing the excellent water molecules absorption between quasi-2D planar structures and generating substantial ionized protons under the hydration effect. [16][17][18][19][20][21] Gradient oxygen-containing groups can be constructed in GO materials by an electric polarization method developed in our previous studies, [16][17][18][19] which will induce inner ion concentration gradient and accordingly produce electricity under humidity variation. Moreover, the high mechanical tolerance and the ease of manufacturing of GO film could provide an ideal platform for construction of electricity generation device with special configuration. [15][16][17][18] Herein, we develop a series of rollable, stretchable, and even 3D space-deformable graphene-based HEG (GHEG) devices (Figure 1a) by laser processing strategy. Serial generator units have been directly embedded in the flexible GO film and exhibit excellent electricity generation ability without any significant performance loss despite being bent arbitrarily (Figure 1a,b). Strikingly, the serpentine or fractal bridge-island-structured GHEGs can power a light-emitting diode (LED) bulb in atmosphere under 100-2000% strain change (Figure 1c). Furthermore, 3D space-deformable architectures of GHEGs (Figure 1d) can be automatically assembled in the shapes of cubic boxes, pyramids, football, and even complex origami structures (Figure 1d,e). These deformable GHEGs will be promising for applications in many complicated conditions. Moisture-triggered electricity generation has attracted much attention because of the effective utilization of the water-molecule diffusion process widely existing in atmosphere. However, the monotonous and rigid structures of previously developed generators have heavily restricted their applications in complex and highly deformable working conditions. Herein, by a rational configuration design with a versatile laser processing strategy, graphenebased hygroelectric generators (GHEGs) of sophisticated architectures with diversified...

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“…There are various energy harvesting systems, such as piezoelectric, triboelectric, thermoelectric, pyroelectric, photovoltaic, and water evaporation‐based energy harvesting systems and those using green energy sources such as solar, wind, wave, heat, and vibrations. These renewable energy harvesting systems have been receiving great attention in the field of research into renewable and sustainable energy harvesters (EHs) to realize self‐powering smart WSN systems and self‐charging electronics . The output performance of energy harvesting systems has rapidly improved, and WSN systems and energy harvesting systems have been combined.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Energy Harvesters: Toward Sustainable Energy Harvesting

2019

Self Cite

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systems and makes them inconvenient for users. [9][10][11] In addition, the periodic exchange of the primary battery causes an enormous waste of resources and complex maintenance problems. [12][13][14] Although the ultralow power consumption system and the high capacity battery can extend the WSN system's operation time, it cannot ensure continuous operation of the system for decades. [15] Thus, an energy harvesting system that converts wasted ambient environment energy into valuable electric energy is one of the important technologies for a future sustainable society. [16][17][18] There are various energy harvesting systems, such as piezoelectric, [19][20][21][22] triboelectric, [23][24][25] thermoelectric, [26][27][28][29][30][31] pyroelectric, [32][33][34] photovoltaic, [35][36][37] and water evaporation-based energy harvesting systems [38,39] and those using green energy sources such as solar, wind, wave, heat, and vibrations. These renewable energy harvesting systems have been receiving great attention in the field of research into renewable and sustainable energy harvesters (EHs) to realize self-powering smart WSN systems and self-charging electronics. [40][41][42][43][44][45][46] The output performance of energy harvesting systems has rapidly improved, and WSN systems and energy harvesting systems have been combined. These two advancements have resulted in extend operation times of small electronic devices. Specialized EH, which uses one kind of green energy, is efficiently converting energy, but this system is fatally flawed because it is influenced by weather conditions. For example, biomechanical energy-based harvesters can generate energy both indoor and outdoors, but specific targeted biomechanical movement is required. [47] Thus, unexpected mechanical energy or other thermal and solar energy is wasted. Similarly, solar EHs can effectively harvest energy under illumination from the sun, but constantly changing weather conditions place constraints on solar cell performance. [48] Furthermore, thermal energy generated by mechanical energy or solar energy is wasted without additional thermal EHs. [49] Therefore, to prevent the useless wasting of energy by a single energy harvesting system, utilizing plural green energy harvesting systems is a countermeasure for sustainable energy harvesting, so that otherwise wasted energy is fully utilized with high energy conversion efficiency, which can power WSN systems at anytime, anywhere.Nature and artificial energies, such as solar, wind, wave, heat, machine vibration, automobile noise continuously exist, so Recently, sustainable green energy harvesting systems have been receiving great attention for their potential use in self-powered smart wireless sensor network (WSN) systems. In particular, though the developed WSN systems are able to advance public good, very high and long-term budgets will be required in order to use them to supply electrical energy through temporary batteries or connecting power cables. This report summarizes recent significant progress in ...

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Triboelectrification-Induced Large Electric Power Generation from a Single Moving Droplet on Graphene/Polytetrafluoroethylene

Cited by 205 publications

References 32 publications

Mechanism of Electric Power Generation from Ionic Droplet Motion on Polymer Supported Graphene

Mechanism of Electric Power Generation from Ionic Droplet Motion on Polymer Supported Graphene

Rollable, Stretchable, and Reconfigurable Graphene Hygroelectric Generators

Hybrid Energy Harvesters: Toward Sustainable Energy Harvesting

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