Lotus leaf-inspired droplet-based electricity generator with low-adhesive superhydrophobicity for a wide operational droplet volume range and boosted electricity output

Yoo, Donghyeon; Kim, See Jo; Joung, Yoonsu; Jang, Sunmin; Choi, Dongwhi; Kim, Dong Sung

doi:10.1016/j.nanoen.2022.107361

Cited by 52 publications

(32 citation statements)

References 40 publications

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“…FEP charges negatively upon contact with a water droplet through liquid-solid contact electrification. [14], [15] These charges are electrostatically induced into the sandwiched electrode also used for wind energy harvesting and into the droplet where oppositely charged ions in the droplet rearrange compensating the surface charges. However due to the top electrodes another mechanism occurs.…”

Section: B Rain Energy Harvestingmentioning

confidence: 99%

“…The spreading and shrinking droplets act additionally as a surface area-changing electrode that transiently connects to electrodes exposed on the surface creating a current. [14], [15] Energy conversion efficiencies of ̴ 2% have been reported and single droplets have been shown to directly power multiple LEDs during the impact. [16] IEEE ROBOTICS AND AUTOMATION LETTERS.…”

Section: Introductionmentioning

confidence: 99%

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Device for Simultaneous Wind and Raindrop Energy Harvesting Operating on the Surface of Plant Leaves

Armiento

Meder

Mazzolai

2023

IEEE Robot. Autom. Lett.

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Soft (bio)hybrid robotics aims at interfacing living beings with artificial technology. It was recently demonstrated that plant leaves coupled with artificial leaves of selected materials and tailored mechanics can convert wind-driven leaf fluttering into electricity. Here, we significantly advance this technology by establishing the additional opportunity to convert kinetic energy from raindrops hitting the upper surface of the artificial leaf into electricity. To achieve this, we integrated an extra electrification layer and exposed electrodes on the free upper surface of the wind energy harvesting leaf that allow to produce a significant current when droplets land and spread on the device. Single water drops create voltage and current peaks of over 40V and 15µA and can directly power 11 LEDs. The same structure has the additional capability to harvest wind energy using leaf oscillations. This shows that environment-responsive biohybrid technologies can be tailored to produce electricity in challenging settings, such as on plants under motion and exposed to rain. The devices have the potential for multisource energy harvesting and as self-powered sensors for environmental monitoring, pointing at applications in wireless sensor networks (WSNs), the internet of things (IoT), smart agriculture, and smart forestry.

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Section: B Rain Energy Harvestingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Device for Simultaneous Wind and Raindrop Energy Harvesting Operating on the Surface of Plant Leaves

Armiento

Meder

Mazzolai

2023

IEEE Robot. Autom. Lett.

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“…One such example is from the droplet-based electricity generator (DEG) reported by Kim and co-workers. [145] They designed a lotus-leaf-like ethylene propylene (FEP) superhydrophobic film with low adhesive force as the dielectric layer in the DEG system. Due to the non-wetted property of the superhydrophobic layer, a wide operational droplet volume range could be utilized to convert the kinetic energy of the microdroplets, including raindrop, dew and precipitation, to electrical output (even 6μL microdroplet bouncing could generate the electrical output).…”

Section: Integrated Superhydrophobic Surface For Various Applicationsmentioning

confidence: 99%

Surface Modification, Topographic Design and Applications of Superhydrophobic Systems

Zhao

Wang

Han

et al. 2022

Chemistry A European J

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Superhydrophobic surfaces with expanded wetting behaviors, like tunable adhesion, hybrid surface hydrophobicity and smart hydrophobic switching have attracted increasing attention due to their broad applications. Herein, the construction methods, mechanisms and advanced applications of special superhydrophobicity are reviewed, and hydro/superhydrophobic modifications are categorized and discussed based on their surface chemistry, and topographic design. The formation and maintenance of special superhydrophobicity in the metastable state are also examined and explored. In addition, particular attention is paid to the use of special wettability in various applications, such as membrane distillation, droplet‐based electricity generators and anti‐fogging surfaces. Finally, the challenges for practical applications and future research directions are discussed.

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“…[ 84 ] Further research also needs to develop configurations and structures of the DEG device based on the optimized modeling/simulation and triboelectric material to enhance the output performance capability and applicability in various actual situations. [ 53,85–87 ]…”

Section: Prospects and Challengesmentioning

confidence: 99%

Droplet‐Based Electricity Generator toward Practicality: Configuration, Optimization, and Hybrid Integration

Huang

Miao

Dai

et al. 2022

Adv Materials Technologies

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the urgent challenges of continuously increased demand for energy, the most commonly utilized energy source, fossil fuel, is limited and can lead to an energy crisis and severe environmental pollution. Alternative methods, such as green energy including solar, [1] wind, [2] and tide energy [3] that harvest various natural energy to solve the energy crisis, might suffer from a strong dependence on specific conditions and have large and complex equipment.Triboelectric nanogenerator (TENG), portability, [4,5] cost-effectiveness, [6,7] and high-efficiency [8,9] energy harvesting device, has become important milestone in the development of energy harvesting. [10,11] Based on the energy harvesting mechanisms of contact electrification and electrostatic charge induction, various mechanical energy can be converted into electricity. [12] In particular, TENG can convert energy from human motion [13,14] (walking, running, and stretching), [15,16] vibration, [17,18] wind, [19,20] rotating tires, [21] and flowing water, [22,23] which may solve the energy crisis by harnessing the widely distributed natural energy. [24][25][26] The energy harvesting system using TENG can harness natural kinetic energy under specific conditions. [27][28][29] While in the practical application, humidity (i.e., water) greatly eliminates the energy harvesting efficiency. [30,31] In principle, water inevitably impacts the dielectric proproteins of the triboelectric material within TENG and leads to output degradation, which limits TENG's application as a stable energy choice. Given that the movement of the ubiquitously existing water can be artificially controlled, if the triboelectrification energy of water droplets can be harvested properly, it may solve the challenge of the humidity impact on TENG theoretically. Thus, the emerging droplet-based power generators (DEG), one type of TENG, have gradually become the cutting-edge application for stable and robust electricity generation. Based on the significant triboelectric effect between the water and the triboelectric material, [32,33] the energy generated by a single water droplet can light multiple LEDs. [34,35] The DEG may fill the urgent needs for the future energy crisis. [36,37] Here, we summarized the recent research progress of DEGs and their application in energy harvesting. We have provided Electricity is the basic and essential need for every single person and guarantees the development of society, industry, and the economy. The limited conventional fossil fuel meets the challenge of the sharply increasing demand, while may lead to severe pollution. Emerging green energy harvesting systems can convert ambient kinetic, thermal, and solar energy to electricity effectivity. In this review paper, the authors provide an overview of the new and emerging methods, droplet-based electricity generators, that convert energy from the ubiquitously existing water droplets. The authors begin with a brief introduction of the working principle for droplet-based power generators. Existing configurations of...

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Lotus leaf-inspired droplet-based electricity generator with low-adhesive superhydrophobicity for a wide operational droplet volume range and boosted electricity output

Cited by 52 publications

References 40 publications

Device for Simultaneous Wind and Raindrop Energy Harvesting Operating on the Surface of Plant Leaves

Device for Simultaneous Wind and Raindrop Energy Harvesting Operating on the Surface of Plant Leaves

Surface Modification, Topographic Design and Applications of Superhydrophobic Systems

Droplet‐Based Electricity Generator toward Practicality: Configuration, Optimization, and Hybrid Integration

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