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

Yang, Shanshan; Su, Yudan; Xu, Ying; Wu, Qiong; Zhang, Yuanbo; Raschke, Markus B.; Ren, Mengxin; Chen, Yan; Wang, Jianlu; Guo, Wanlin; Shen, Y. R.; Tian, Chuanshan

doi:10.1021/jacs.8b07778

Cited by 102 publications

(82 citation statements)

References 48 publications

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“…The operation of a TENG mainly relies on the interfacial electrostatic field, which outputs power due to the internal Maxwell displacement current induced by mechanical motion 3,4 . So far, TENGs can harvest energy from tribo-contacts at the interfaces of various substances 5 , including the solid–solid interface 6 , solid–liquid interface 7 and even the solid/liquid–air interface 8 . Targeting different mechanical energy sources, TENGs have been successfully applied in four major areas: micro/nano power sources 9,10 , self-powered sensors 11,12 , blue energy harvester 13 , and high-voltage sources 14,15 .…”

Section: Introductionmentioning

confidence: 99%

Power generation from the interaction of a liquid droplet and a liquid membrane

et al. 2019

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Triboelectric nanogenerators are an energy harvesting technology that relies on the coupling effects of contact electrification and electrostatic induction between two solids or a liquid and a solid. Here, we present a triboelectric nanogenerator that can work based on the interaction between two pure liquids. A liquid–liquid triboelectric nanogenerator is achieved by passing a liquid droplet through a freely suspended liquid membrane. We investigate two kinds of liquid membranes: a grounded membrane and a pre-charged membrane. The falling of a droplet (about 40 μL) can generate a peak power of 137.4 nW by passing through a pre-charged membrane. Moreover, this membrane electrode can also remove and collect electrostatic charges from solid objects, indicating a permeable sensor or charge filter for electronic applications. The liquid–liquid triboelectric nanogenerator can harvest mechanical energy without changing the object motion and it can work for many targets, including raindrops, irrigation currents, microfluidics, and tiny particles.

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Section: Introductionmentioning

confidence: 99%

Power generation from the interaction of a liquid droplet and a liquid membrane

et al. 2019

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“…These results suggest an important interaction of the surface dipoles of substrates with the EDL formed between graphene and water, which dominates the output power in graphene. This interaction was further revealed by Yang et al [31] via sum-frequency vibrational spectroscopy. By comparing the ion distributions at water/graphene interfaces on PET with surface dipoles and those on polymethyl methacrylate (PMMA) without the dipoles, they concluded that the surface dipole layer is responsible for selective ion adsorption on graphene, while graphene itself acts as a conducting sheet to transport induced carriers [32,33].…”

Section: Introductionmentioning

confidence: 71%

“…Subsequent experiments have shown that the generated electricity substantially depends on the substrates [29][30][31]. Graphene on a polytetrafluoroethylene (PTFE) substrate has been shown to possess a high carrier density and achieve a 100-fold enhancement of the output power [30].…”

Section: Introductionmentioning

confidence: 99%

Mechanistic insight into electricity generation from moving ionic droplets on graphene

Zhang

Guo

2021

Sci. China Mater.

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Recent experiments have demonstrated that moving water droplets on polymer-supported graphene can generate electric voltages in graphene. Here, we perform a multi-scale analysis on the mechanism of the generated voltages on the basis of an interplay among the substrate, graphene and ionic water. We find that the attraction of ions in water by substrate dipoles drives charge redistribution in graphene, forming an electric triple layer (ETL) at the water/ graphene/substrate interface, made of an ion layer fixed on graphene, an image charge layer in graphene and a counterion layer in water. As a droplet moves on graphene, dynamic formation of the ETL at its front end drives a flow of charge in graphene. Using Langmuir adsorption theory combined with ab initio calculations, we determine the ion concentration in the ETL and estimate the amount of charge that each ion can draw in graphene. Then, the electric current in graphene is formulated in terms of ion concentration, droplet velocity, graphene thickness and density of substrate dipoles, which well reproduces experimentally measured currents in graphene. These results underscore the importance of tailoring substrate dipoles in optimizing the performance of devices for water energy harvesting and promoting practical applications.

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“…Because the screening effect of the water for the piezoelectric charges becomes smaller with few-layer graphene, the flow-induced voltage decreases rapidly when bilayer or trilayer graphene was used (Figure 4(i)). Recently, Yang et al used sum-frequency vibrational spectroscopy to study the interactions at the aqueous solution/graphene/polymer interface and found a different mechanism (Figure 4(f)) [83]. They proposed that the monolayer graphene does not attract ions and only plays the role of transporting carriers and ions in droplets.…”

Section: Monolayer 2-d Materials For Energy Harvestingmentioning

confidence: 99%

“…(f) Sum-frequency vibrational spectroscopy for the mechanism study of electric power generation from ionic droplet motion on polymer-supported graphene. Reproduced with permission from the American Chemical Society [83]. (h) Triboelectrification-induced large electric power generation from a single moving droplet on graphene/PTFE.…”

Section: Figurementioning

confidence: 99%

Emerging Devices Based on Two-Dimensional Monolayer Materials for Energy Harvesting

Fan

2019

Research

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Two-dimensional (2-D) materials of atomic thickness have attracted considerable interest due to their excellent electrical, optoelectronic, mechanical, and thermal properties, which make them attractive for electronic devices, sensors, and energy systems. Scavenging the otherwise wasted energy from the ambient environment into electrical power holds promise to address the emerging energy needs, in particular for the portable and wearable devices. The versatile properties of 2-D materials together with their atomically thin body create diverse possibilities for the conversion of ambient energy. The present review focuses on the recent key advances in emerging energy-harvesting devices based on monolayer 2-D materials through various mechanisms such as photovoltaic, thermoelectric, piezoelectric, triboelectric, and hydrovoltaic devices, as well as progress for harvesting the osmotic pressure and Wi-Fi wireless energy. The representative achievements regarding the monolayer heterostructures and hybrid devices are also discussed. Finally, we provide a discussion of the challenges and opportunities for 2-D monolayer material-based energy-harvesting devices in the development of self-powered electronics and wearable technologies.

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

Cited by 102 publications

References 48 publications

Power generation from the interaction of a liquid droplet and a liquid membrane

Power generation from the interaction of a liquid droplet and a liquid membrane

Mechanistic insight into electricity generation from moving ionic droplets on graphene

Emerging Devices Based on Two-Dimensional Monolayer Materials for Energy Harvesting

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