Hydrovoltaic Energy on the Way

Yin, Jun; Zhou, Jianxin; Fang, Sunmiao; Guo, Wei

doi:10.1016/j.joule.2020.07.015

Cited by 153 publications

(120 citation statements)

References 16 publications

(18 reference statements)

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“…Natural water is the most abundant resource, covering over 70% of the Earth’s surface, and evaporation is an important part of the water cycle 1 , 2 . Due to the spontaneity and universality of water evaporation, hydrovoltaic generators (HGs) driven by water evaporation have been extensively developed in recent years.…”

Section: Introductionmentioning

confidence: 99%

Enhancing hydrovoltaic power generation through heat conduction effects

Feng

Bai

et al. 2022

Nat Commun

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Restricted ambient temperature and slow heat replenishment in the phase transition of water molecules severely limit the performance of the evaporation-induced hydrovoltaic generators. Here we demonstrate a heat conduction effect enhanced hydrovoltaic power generator by integrating a flexible ionic thermoelectric gelatin material with a porous dual-size Al2O3 hydrovoltaic generator. In the hybrid heat conduction effect enhanced hydrovoltaic power generator, the ionic thermoelectric gelatin material can effectively improve the heat conduction between hydrovoltaic generator and near environment, thus increasing the water evaporation rate to improve the output voltage. Synergistically, hydrovoltaic generator part with continuous water evaporation can induce a constant temperature difference for the thermoelectric generator. Moreover, the system can efficiently achieve solar-to-thermal conversion to raise the temperature difference, accompanied by a stable open circuit voltage of 6.4 V for the hydrovoltaic generator module, the highest value yet.

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Section: Introductionmentioning

confidence: 99%

Enhancing hydrovoltaic power generation through heat conduction effects

Feng

Bai

et al. 2022

Nat Commun

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“…Another mechanism for energy harvesting from the interaction between solid surface and water is the hydrovoltaic effect [ 22 , 23 , 45 ]. Devices whose working mechanism is based on the hydrovoltaic principle generate electricity if at least one of the following conditions is fulfilled: the presence of diffusion as a consequence of concentration gradient, fluid flow (waving, streaming, pressure or gradient-induced), or gradient in ion concentration as a consequence of nonequilibrium in water desorption from its surface [ 23 ].…”

Section: Resultsmentioning

confidence: 99%

Full-Self-Powered Humidity Sensor Based on Electrochemical Aluminum–Water Reaction

Bošković

Šljukić

Radović

et al. 2021

Sensors

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A detailed examination of the principle of operation behind the functioning of the full-self-powered humidity sensor is presented. The sensor has been realized as a structure consisting of an interdigitated capacitor with aluminum thin-film digits. In this work, the details of its fabrication and activation are described in detail. The performed XRD, FTIR, SEM, AFM, and EIS analyses, as well as noise measurements, revealed that the dominant process of electricity generation is the electrochemical reaction between the sensor’s aluminum electrodes and the water from humid air in the presence of oxygen, which was the main goal of this work. The response of the sensor to human breath is also presented as a demonstration of its possible practical application.

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“…The voltage in graphene induced by drawing droplets has been coined as drawing potential, while that induced by waving water is called waving potential [20]. The drawing and waving potentials are important forms of hydrovoltaic effect [23,28], an emerging field of electricity generation in nanostructured materials on direct interaction with water. The two forms of hydrovoltaic effects share a distinctly different mechanism from that of the streaming potential: the liquidgas interfaces on graphene create boundaries of the EDL between graphene and water, which moves along graphene to generate an electric current in graphene.…”

Section: Introductionmentioning

confidence: 99%

Mechanistic insight into electricity generation from moving ionic droplets on graphene

Zhang

Guo

2021

Sci. China Mater.

Self Cite

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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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Hydrovoltaic Energy on the Way

Abstract: and Astronautics (NUAA) in 2016, after which he worked in the University of Manchester as a research associate for 3 years. Then, he joined NUAA in 2019 as a professor. His research focuses on surface/interface interaction of nanomaterials and their applications.

Cited by 153 publications

References 16 publications

Enhancing hydrovoltaic power generation through heat conduction effects

Enhancing hydrovoltaic power generation through heat conduction effects

Full-Self-Powered Humidity Sensor Based on Electrochemical Aluminum–Water Reaction

Mechanistic insight into electricity generation from moving ionic droplets on graphene

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