A unified contact force-dependent model for triboelectric nanogenerators accounting for surface roughness

Xu, Yang; Min, Guanbo; Gadegaard, Nikolaj; Dahiya, Ravinder; Mulvihill, Daniel M.

doi:10.1016/j.nanoen.2020.105067

Cited by 73 publications

(54 citation statements)

References 29 publications

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“…The recent studies show that the energy autonomy in WQ sensors can be addressed by using self-powered system such as solar powered sensors [33,108,[199][200][201] or triboelectric/piezoelectric based sensors. Further new renewable solutions such as harnessing wave energy using triboelectric nanogenerators (TENG) could be used to power the sensors as well as the autonomous vehicles [202][203][204]. Such energy autonomous sensing networks can also be useful for monitoring of water quality in fish farms, pollution in river water and the drinking water in the pipelines (supply system in metropolitan areas) and open water bodies .…”

Section: Energy Autonomous Sensorsmentioning

confidence: 99%

Connected Sensors, Innovative Sensor Deployment, and Intelligent Data Analysis for Online Water Quality Monitoring

Manjakkal

Mitra

Pétillot

et al. 2021

IEEE Internet Things J.

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The sensor technology for water quality monitoring (WQM) has improved during recent years. The cost-effective sensorised tools that can autonomously measure the essential physical -chemical and biological (PCB) variables are now readily available and are being deployed on buoys, boats and ships. Yet, there is a disconnect between the data quality, data gathering and data analysis due to the lack of standardized approaches for data collection and processing, spatio-temporal variation of key parameters in water bodies and new contaminants. Such gaps can be bridged with a network of multiparametric sensor systems deployed in water bodies using autonomous vehicles such as marine robots and aerial vehicles to broaden the data coverage in space and time. Further, intelligent algorithms (e. g. artificial intelligence (AI)) could be employed for standardised data analysis and forecasting. This paper presents a comprehensive review of the sensors, deployment and analysis technologies for WQM. A network of networked water bodies could enhance the global data intercomparability and enable WQM at global scale to address global challenges related to food (e.g., aqua/agriculture), drinking water, and health (e.g., water borne diseases).

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Section: Energy Autonomous Sensorsmentioning

confidence: 99%

Connected Sensors, Innovative Sensor Deployment, and Intelligent Data Analysis for Online Water Quality Monitoring

Manjakkal

Mitra

Pétillot

et al. 2021

IEEE Internet Things J.

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“…( 7 ) will be replaced by Eq. ( 13 ) based on the model presented by Dharmasena et al 60 , 61 : S (m 2 ) indicates the area of the flat surface of the fixed part and A (m 2 ) is the real contact area between flat and porous layers. Also in the porous layer in the presence of humidity, the dielectric constant is replaced as below 57 : where and V s are dielectric constant and volume fraction of solid and and V p are dielectric constant and Volume fraction of pore (air and water) in the porous layer.…”

Section: Numerical Simulationmentioning

confidence: 99%

Nanostructured versus flat compact electrode for triboelectric nanogenerators at high humidity

Karimi

Seddighi

Mohammadpour

2021

Sci Rep

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The triboelectric nanogenerator (TENG) is a promising technology for mechanical energy harvesting. TENG has proven to be an excellent option for power generation but typically TENGs output power drops significantly in humid environments. In this work, the effect of electrode’s material on power output, considering smooth and nanostructured porous structures with various surface hydrophobicity, is investigated under various humidity conditions. A vertical contact-separation mode TENG is experimentally and numerically studied for four surface morphologies of Ti foil, TiO2 thin film, TiO2 nanoparticulated film, and TiO2 nanotubular electrodes. The results show that the TENG electrical output in the flat structures such as Ti foil and TiO2 thin film at 50% RH is reduced to 50% of its initial state, while in the nanoporous structures such as nanoparticle and nanotube arrays, this is observed at RH above 95%. The results show that the use of porous nanostructures in TENG due to their high surface-to-volume, and that the process of water adsorption on the pore leads to better performance than the flat surface in humid environments. Based on our study, employing nanoporous layers is vital for nanogenerators either for power generation or active sensor applications at high humidity conditions.

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“…Wearable systems incorporating physical, chemical, and biological sensors and actuators have rapidly become an inseparable part of our lives for their use in a wide range of applications, such as personalized health monitoring, wellness‐tracking, early‐warning for COVID‐19, exoskeletons, prosthetics, and interactive systems for augmented/virtual reality. [ 1–9 ] The continuous operation of these systems is juxtaposed with the reliable and sustainable energy sources, currently met through: a) energy harvesters based on mechanisms such as photovoltaics, [ 10–13 ] piezoelectricity, [ 14–16 ] triboelectricity, [ 14,17–19 ] and theremoelectricity, [ 20–22 ] etc. ; b) energy storage devices such as Li‐ion batteries (LiB) [ 23–27 ] and supercapacitors (SCs), [ 28–35 ] etc.…”

Section: Introductionmentioning

confidence: 99%

“…Fully sweat‐based wearables will be an important step toward safe and sustainable autonomous systems for continuous monitoring of vital health‐related parameters. [ 2,17,18,23,26,45,46,54–56 ]…”

Section: Introductionmentioning

confidence: 99%

Energy Autonomous Sweat‐Based Wearable Systems

et al. 2021

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The continuous operation of wearable electronics demands reliable sources of energy, currently met through Li‐ion batteries and various energy harvesters. These solutions are being used out of necessity despite potential safety issues and unsustainable environmental impact. Safe and sustainable energy sources can boost the use of wearables systems in diverse applications such as health monitoring, prosthetics, and sports. In this regard, sweat‐ and sweat‐equivalent‐based studies have attracted tremendous attention through the demonstration of energy‐generating biofuel cells, promising power densities as high as 3.5 mW cm−2, storage using sweat‐electrolyte‐based supercapacitors with energy and power densities of 1.36 Wh kg−1 and 329.70 W kg−1, respectively, and sweat‐activated batteries with an impressive energy density of 67 Ah kg−1. A combination of these energy generating, and storage devices can lead to fully energy‐autonomous wearables capable of providing sustainable power in the µW to mW range, which is sufficient to operate both sensing and communication devices. Here, a comprehensive review covering these advances, addressing future challenges and potential solutions related to fully energy‐autonomous wearables is presented, with emphasis on sweat‐based energy storage and energy generation elements along with sweat‐based sensors as applications.

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A unified contact force-dependent model for triboelectric nanogenerators accounting for surface roughness

Cited by 73 publications

References 29 publications

Connected Sensors, Innovative Sensor Deployment, and Intelligent Data Analysis for Online Water Quality Monitoring

Connected Sensors, Innovative Sensor Deployment, and Intelligent Data Analysis for Online Water Quality Monitoring

Nanostructured versus flat compact electrode for triboelectric nanogenerators at high humidity

Energy Autonomous Sweat‐Based Wearable Systems

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