A new type of triboelectric nanogenerator with self-actuated series-to-parallel electrical interface based on self-synchronized mechanical switches for exponential charge accumulation in a capacitor

Ouanes, M. A. Ben; Samaali, Hatem; Galayko, Dimitri; Basset, Philippe; Najar, Fehmi

doi:10.1016/j.nanoen.2019.05.049

Cited by 25 publications

(12 citation statements)

References 31 publications

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“…Additionally, desired higher voltages can be obtained with a series connection of NGs. [ 35 ] Here, increased voltage of ≈2.4 and ≈3.6 V (positive cycle only) for 2 and 3 cells, respectively, was observed when cells were connected in a series combination (Figure S13b, Supporting Information). We further used the NG as a proof of concept for sensing low‐pressure breathable sensors.…”

Section: Resultsmentioning

confidence: 99%

Flexible Nanogenerators Based on Enhanced Flexoelectricity in Mn₃O₄ Membranes

Chowde Gowda,

Cavin,

Kumbhakar

et al. 2023

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Atomically thin, few‐layered membranes of oxides show unique physical and chemical properties compared to their bulk forms. Manganese oxide (Mn3O4) membranes are exfoliated from the naturally occurring mineral Hausmannite and used to make flexible, high‐performance nanogenerators (NGs). An enhanced power density in the membrane NG is observed with the best‐performing device showing a power density of 7.99 mW m−2 compared to 1.04 µW m−2 in bulk Mn3O4. A sensitivity of 108 mV kPa−1 for applied forces <10 N in the membrane NG is observed. The improved performance of these NGs is attributed to enhanced flexoelectric response in a few layers of Mn3O4. Using first‐principles calculations, the flexoelectric coefficients of monolayer and bilayer Mn3O4 are found to be 50–100 times larger than other 2D transition metal dichalcogenides (TMDCs). Using a model based on classical beam theory, an increasing activation of the bending mode with decreasing thickness of the oxide membranes is observed, which in turn leads to a large flexoelectric response. As a proof‐of‐concept, flexible NGs using exfoliated Mn3O4 membranes are made and used in self‐powered paper‐based devices. This research paves the way for the exploration of few‐layered membranes of other centrosymmetric oxides for application as energy harvesters.

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Section: Resultsmentioning

confidence: 99%

Flexible Nanogenerators Based on Enhanced Flexoelectricity in Mn₃O₄ Membranes

Chowde Gowda,

Cavin,

Kumbhakar

et al. 2023

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“…Ouanes et al [54] employed it in the modelling of a new concept impact-based TEH and showed a good correlation between their theoretical and experimental models. At impact, Newton's law of restitution gives…”

Section: Modelling Of the Mechanical System Of The Tehmentioning

confidence: 99%

Effects of electrical properties on vibrations via electromechanical coupling in triboelectric energy harvesting

Ouyang

Davis

2020

J. Phys. D: Appl. Phys.

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Vibration energy harvesting has been a popular research topic in recent years and is a promising technology in the development of the Internet of Things. Triboelectric energy harvesting, as a relatively new energy harvesting technique, is drawing attention. However, relevant studies from the perspective of structural dynamics are rare, and a study on how the electrical properties of triboelectric energy harvesters (TEHs) affect their vibration is still missing. In this paper, we perform such a study for TEHs that use the two most common working modes—namely the lateral sliding mode and the vertical contact-separation mode. In the first part of the paper, the coupled electromechanical model of a sliding mode TEH—based on a cantilever beam system involving friction—is established. The effects of the tribo-charge surface density and the load resistance on the vibration of the harvester are investigated. It is found that the effects of the tribo-charge surface density on vibrations are similar to those of mechanical damping, while the load resistance can result in an interesting resistive shunt damping phenomenon which is distinct from the one found in piezoelectric energy harvesters. In the second part, the modelling of a vertical contact-separation mode TEH is established based on a single-degree-of-freedom vibro-impact oscillator, and the effects of the same electrical properties on vibrations are studied. The variation of the tribo-charge surface density can result in both vibration amplitude attenuation and resonance frequency shifting, while the change of the load resistance can influence vibrations only in the case of large tribo-charge surface densities. This study further unveils the electromechanical coupling mechanisms in TEHs and sheds some light on achieving desirable dynamic responses of TEHs via tuning their electrical properties.

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“…Additionally, desired higher voltages can be obtained with a series connection of TENGs 42 . Here, increased voltage of ~1.2 V and ~1.8 V (positive cycle only) for 2 and 3 cells, respectively, was observed when cells were connected in a series combination (SI section 5 Fig.…”

Section: Introductionmentioning

confidence: 99%

Flexible Nanogenerators based on Enhanced Flexoelectricity in Hausmannite Membranes

Gowda

Cavin

Kumbhakar

et al. 2022

Preprint

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Atomically thin, few-layered membranes of oxides show unique physical and chemical properties compared to their bulk forms. We have exfoliated manganese oxide (Mn3O4) membranes from naturally occurring Hausmannite and used them to make flexible, high-performance nanogenerators. We observe an enhanced power density in the membrane nanogenerators (NG) with the best-performing device showing a power density of 7.20 µW cm-2 compared to 1.04 µW cm-2 obtained from NG made up of bulk Mn3O4. We also observe a sensitivity of 108 mV/kPa for applied forces < 10 N in the membrane NGs. We attribute the improved performance to enhanced flexoelectric response in few-layers Mn3O4. Using first-principles calculations, we calculate the flexoelectric coefficients of monolayer and bilayer Mn3O4, and find them to be 50 – 100 times larger than two-dimensional transition metal dichalcogenides. We also show the presence of a destructive interference between the bending and shear modes in bulk Mn3O4 that almost cancel the overall flexoelectric coefficients. Dimensional reduction in the Mn3O4 suppresses the response to the shear modes and results in large flexoelectric coefficients. As a proof-of-concept, we made flexible triboelectric nanogenerators (TENG) using exfoliated Mn3O4 membranes and used them in self-powered devices such as paper based TENG. This research paves the way for exploration of few-layer membranes of other centrosymmetric oxides for application as energy harvesters.

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A new type of triboelectric nanogenerator with self-actuated series-to-parallel electrical interface based on self-synchronized mechanical switches for exponential charge accumulation in a capacitor

Cited by 25 publications

References 31 publications

Flexible Nanogenerators Based on Enhanced Flexoelectricity in Mn₃O₄ Membranes

Flexible Nanogenerators Based on Enhanced Flexoelectricity in Mn₃O₄ Membranes

Effects of electrical properties on vibrations via electromechanical coupling in triboelectric energy harvesting

Flexible Nanogenerators based on Enhanced Flexoelectricity in Hausmannite Membranes

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A new type of triboelectric nanogenerator with self-actuated series-to-parallel electrical interface based on self-synchronized mechanical switches for exponential charge accumulation in a capacitor

Cited by 25 publications

References 31 publications

Flexible Nanogenerators Based on Enhanced Flexoelectricity in Mn3O4 Membranes

Flexible Nanogenerators Based on Enhanced Flexoelectricity in Mn3O4 Membranes

Effects of electrical properties on vibrations via electromechanical coupling in triboelectric energy harvesting

Flexible Nanogenerators based on Enhanced Flexoelectricity in Hausmannite Membranes

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Flexible Nanogenerators Based on Enhanced Flexoelectricity in Mn₃O₄ Membranes

Flexible Nanogenerators Based on Enhanced Flexoelectricity in Mn₃O₄ Membranes