Octopus tentacles inspired triboelectric nanogenerators for harvesting mechanical energy from highly wetted surface

Yu, Qian; Nie, Jinhui; Ma, Xiaoping; Ren, Zewei; Tian, Jingwen; Chen, Jieyi; Shen, Honglie; Chen, Xiangyu; Li, Yufang

doi:10.1016/j.nanoen.2019.03.068

Cited by 42 publications

(41 citation statements)

References 53 publications

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“…A similar operation has been adopted by Zhang et al's study, [104] where silicone rubber was casted on a triangular mold to improve the sensitivity to human motions. Another interesting work worthy to mention is that, Qian et al [54] have observed that the honeycomb surface (Figure 8j) did not improve the characteristics of H-TENGs, but increased the output by two times on a waterbearing interface. Unlike these above reports, Chen et al [118] have performed 3D printing to fabricate H-TENGs and in the printed ultraflexible component with rough microstructures (Figure 8k), hydrogels with 3D printed shell were well matched inside this part and thus effective contact and separation could be accomplished.…”

Section: Surface Modificationmentioning

confidence: 98%

“…Meanwhile, Ag NWs have also been reported in mixtures with PVA hydrogels to avoid the unevenness and brittleness of the hydrogels while improving the conductivity of PVA hydrogels. [54] Alternatively, Jakmuangpak et al [71] have introduced ZnO nanoparticles into a bacterial cellulose (BC) hydrogel. As shown in Figure 5m, the BC hydrogel was immersed in the ZnCl 2 solution and soaked in NaOH at 55 °C.…”

Section: Other Hydrogelsmentioning

confidence: 99%

“…Since then, many reported H-TENGs have utilized the same BP chemistry to enhance the mechanical reliability of polymer interfaces. [54,59,81,96] Among them, there has been one work directly comparing the output and long-term stability of H-TENGs with or without the BP treatment. [96] As shown in Figure 6g, the open-circuit voltage (V OC ) of the PAM/NaCl-based TENGs after the BP treatment was slightly higher than that without the BP treatment.…”

Section: Mechanical Reliabilitymentioning

confidence: 99%

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Hydrogels as Soft Ionic Conductors in Flexible and Wearable Triboelectric Nanogenerators

Luo

Cuthbert

et al. 2022

Advanced Science

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Flexible triboelectric nanogenerators (TENGs) have attracted increasing interest since their advent in 2012. In comparison with other flexible electrodes, hydrogels possess transparency, stretchability, biocompatibility, and tunable ionic conductivity, which together provide great potential as current collectors in TENGs for wearable applications. The development of hydrogel-based TENGs (H-TENGs) is currently a burgeoning field but research efforts have lagged behind those of other common flexible TENGs. In order to spur research and development of this important area, a comprehensive review that summarizes recent advances and challenges of H-TENGs will be very useful to researchers and engineers in this emerging field. Herein, the advantages and types of hydrogels as soft ionic conductors in TENGs are presented, followed by detailed descriptions of the advanced functions, enhanced output performance, as well as flexible and wearable applications of H-TENGs. Finally, the challenges and prospects of H-TENGs are discussed.

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Section: Surface Modificationmentioning

confidence: 98%

Section: Other Hydrogelsmentioning

confidence: 99%

Section: Mechanical Reliabilitymentioning

confidence: 99%

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Hydrogels as Soft Ionic Conductors in Flexible and Wearable Triboelectric Nanogenerators

Luo

Cuthbert

et al. 2022

Advanced Science

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“…So covering the substrate surface with the nanotube, nanoparticle, nanowire, and porous media can improve the performance of TENG due to an increased internal surface area as also suggested in 13 , 15 , 32 – 35 . On the other hand, TENG charge vanishes in humid environments because of the formation of water film on the surface 19 , 36 , 37 . Since humidity is ubiquitous in environments where TENG is used, improving the TENG operation in humid environments is of great importance as also indicated in 38 , 39 .…”

Section: Introductionmentioning

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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“…For example, in order to avoid the adhesion of water molecules to the friction surface, a previous work found polytetrafluoroethylene (PTFE) with hydrophobic properties to effectively function as the friction layer of TENG [42], thereby eliminating the influence of water molecules in the environment on the electrical output of the device. A number of other approaches to reduce environmental interference on TENG have been explored with the aim of realizing the objective of reliable self-powered micro-nano systems [43][44][45].…”

Section: Introductionmentioning

confidence: 99%

Electron-Ion Coupling Mechanism to Construct Stable Output Performance Nanogenerator

Bao

Liu

et al. 2021

Research

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Recently, triboelectric nanogenerators (TENGs) have been promoted as an effective technique for ambient energy harvesting, given their large power density and high energy conversion efficiency. However, traditional TENGs based on the combination of triboelectrification effect and electrostatic induction have proven susceptible to environmental influence, which intensively restricts their application range. Herein, a new coupling mechanism based on electrostatic induction and ion conduction is proposed to construct flexible stable output performance TENGs (SOP-TENGs). The calcium chloride doped-cellulose nanofibril (CaCl2-CNF) film made of natural carrots was successfully introduced to realize this coupling, resulting from its intrinsic properties as natural nanofibril hydrogel serving as both triboelectric layer and electrode. The coupling of two conductive mechanisms of SOP-TENG was comprehensively investigated through electrical measurements, including the effects of moisture content, relative humidity, and electrode size. In contrast to the conventional hydrogel ionotronic TENGs that require moisture as the carrier for ion transfer and use a hydrogel layer as the electrode, the use of a CaCl2-CNF film (i.e., ion-doped natural hydrogel layer) as a friction layer in the proposed SOP-TENG effectively realizes a superstable electrical output under varying moisture contents and relative humidity due to the compound transfer mechanism of ions and electrons. This new working principle based on the coupling of electrostatic induction and ion conduction opens a wider range of applications for the hydrogel ionotronic TENGs, as the superstable electrical output enables them to be more widely applied in various complex environments to supply energy for low-power electronic devices.

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Octopus tentacles inspired triboelectric nanogenerators for harvesting mechanical energy from highly wetted surface

Cited by 42 publications

References 53 publications

Hydrogels as Soft Ionic Conductors in Flexible and Wearable Triboelectric Nanogenerators

Hydrogels as Soft Ionic Conductors in Flexible and Wearable Triboelectric Nanogenerators

Nanostructured versus flat compact electrode for triboelectric nanogenerators at high humidity

Electron-Ion Coupling Mechanism to Construct Stable Output Performance Nanogenerator

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