气候变化领域集成服务门户(CCPortal): Self-operating transpiration-driven electrokinetic power generator with an artificial hydrological cycle

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DOI	10.1039/c9ee02616a
	Self-operating transpiration-driven electrokinetic power generator with an artificial hydrological cycle
	Bae J.; Yun T.G.; Suh B.L.; Kim J.; Kim I.-D.
发表日期	2020
ISSN	17545692
起始页码	527
结束页码	534
卷号	13 期号:2
英文摘要	Autonomous energy scavenging from the ambient environment, or self-energy management, has attracted increasing attention because it could solve the energy problem of abundant Internet of things (IoT) devices. In recent years, several energy harvesters that generate electricity using water have been invented due to their simplicity, sustainability, and eco-friendliness. Until now, the devices have required periodic supplementation of water for continuous electricity generation, which hinders their practical use. Here, we built an artificial hydrological cycle in a transpiration-driven electrokinetic power generator (TEPG) to continuously and autonomously generate electric power. The TEPG, composed of carbon-coated cotton fabric, generates electricity by using a few drops of water (0.2 mL); the electric power originates from the potential difference in the asymmetrically wetted device and the pseudostreaming current. However, after only one hour, the TEPG stops generating electricity, as water inevitably evaporates from the device. For continuous self-operation, we utilized calcium chloride (CaCl2), a typical deliquescent chemical, to collect water vapor from the surrounding environment and continuously supply water to the TEPG. In the range of 15-60% relative humidity (RH), CaCl2 successfully compensates for the water loss by evaporation and maintains the electrical power generation in the closed system. In addition, CaCl2 enhances the generated voltage (0.74 V) and current (22.5 μA) by supplying additional Ca2+ ions to the carbon surface and reducing the resistance of the device, respectively. The developed self-operating transpiration-driven electrokinetic power generator (STEPG) is stable enough to light a light-emitting diode (LED) for a week and charge a commercialized supercapacitor (5 F) to 1.6 V for 8 days. © 2020 The Royal Society of Chemistry.
英文关键词	Calcium chloride; Carbon; Electrodynamics; Energy harvesting; Internet of things; Sustainable development; Transpiration; Ambient environment; Continuous electricity generations; Electrical power generation; Generate electricity; Hydrological cycles; Internet of Things (IOT); Potential difference; Surrounding environment; Electric power generation; electrical power; electricity generation; electrode; electronic equipment; hydrological cycle; ion; power generation; relative humidity; water vapor; Gossypium hirsutum
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/189707
作者单位	Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu Daejeon, 34141, South Korea; Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu Daejeon, 34141, South Korea
推荐引用方式 GB/T 7714	Bae J.,Yun T.G.,Suh B.L.,et al. Self-operating transpiration-driven electrokinetic power generator with an artificial hydrological cycle[J],2020,13(2).
APA	Bae J.,Yun T.G.,Suh B.L.,Kim J.,&Kim I.-D..(2020).Self-operating transpiration-driven electrokinetic power generator with an artificial hydrological cycle.Energy & Environmental Science,13(2).
MLA	Bae J.,et al."Self-operating transpiration-driven electrokinetic power generator with an artificial hydrological cycle".Energy & Environmental Science 13.2(2020).