Ionic liquid-based molecular design for transparent, flexible, and fire-retardant triboelectric nanogenerator (TENG) for wearable energy solutions

Kim, Young-Kyun; Lee, Dawoon; Seong, Junsu; Bak, Byeongwoo; Choi, U Hyeok; Kim, Jaekyun

doi:10.1016/j.nanoen.2021.105925

Cited by 75 publications

(37 citation statements)

References 54 publications

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“…Stretchable and transparent conductors with high electron mobility, flexibility and broadband transparency are required for applications in next‐generation flexible and wearable devices. [ 191 ] Graphene has been previously studied as transparent electrodes due to its special optical property. [ 192,193 ] However, the practical application of graphene for transparent conductor is limited to the low sheet resistance (R s ) and transmittance.…”

Section: Applications Of Intercalation In 2d Materialsmentioning

confidence: 99%

Intercalation Strategy in 2D Materials for Electronics and Optoelectronics

Wang

et al. 2021

Small Methods

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Intercalation is an effective approach to tune the physical and chemical properties of 2D materials due to their abundant van der Waals gaps that can host high‐density intercalated guest matters. This approach has been widely employed to modulate the optical, electrical, and photoelectrical properties of 2D materials for their applications in electronic and optoelectronic devices. Thus it is necessary to review the recent progress of the intercalation strategy in 2D materials and their applications in devices. Herein, various intercalation strategies and the novel properties of the intercalated 2D materials as well as their applications in electronics and optoelectronics are summarized. In the end, the development tendency of this promising approach for 2D materials is also outlined.

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Section: Applications Of Intercalation In 2d Materialsmentioning

confidence: 99%

Intercalation Strategy in 2D Materials for Electronics and Optoelectronics

Wang

et al. 2021

Small Methods

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“…The liquid‐based TENG was designed to generate electrical outputs under ultrasound excitation, aiming to provide a source of wireless electrical stimulation 123 . This type of liquid‐based TENGs is still under development but has been suggested as an alternative to significantly enhance the electrical output as wearable electronics 124,125 …”

Section: Hydrogel Overviewmentioning

confidence: 99%

“…123 This type of liquidbased TENGs is still under development but has been suggested as an alternative to significantly enhance the electrical output as wearable electronics. 124,125…”

Section: Performance Of Hydrogel-based Tengsmentioning

confidence: 99%

Hydrogel‐based triboelectric nanogenerators: Properties, performance, and applications

Torres

Troncoso

De-la-Torre

2021

Intl J of Energy Research

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Summary The development of triboelectric nanogenerators (TENGs) in 2012 revolutionized the vision of environmental energy harvesting. Nowadays, TENG assembly, working mode, and material selection are investigated continuously in order to obtain high‐performance and long‐lasting devices. Hydrogels are flexible and stretchable water‐swollen 3D polymer networks, which can be tailored to conduct electricity and render outstanding mechanical properties. Hydrogels have been used to develop novel flexible wearable TENGs. Here, we review the current knowledge concerning hydrogel‐based TENGs, including an overview of relevant hydrogel characteristics, hydrogel‐based TENG performance, and their practical applications. The single‐electrode TENG working mode is the most popular in hydrogel‐based TENGs as they can be easily attached and stretched for biomechanical energy harvesting. Hydrogel‐based TENGs have demonstrated to be capable of delivering high electrical output (250‐400 V, ≥10 μA) and being robust enough for devices that last for several months. Biomechanical energy sensing and harvesting, smart farming, biomedical, and human–machine control interfaces are investigated as potential applications of hydrogel‐based TENGs. Interestingly, energy harvesting from human motion is of particular interest for this type of TENG due to its outstanding stretchability, strength, and additional physical properties, such as self‐healing ability. In most cases, the devices are capable of powering small electronics entirely from harvested biomechanical energy. Biomedical applications involved wound healing acceleration driven by TENG‐powered electrical stimuli and disease monitoring, including implantable devices. Despite showing promising electrical performance, controlling water evaporation is still challenging to maintain the mechanical and conductive properties of hydrogel‐based TENGs. On the other hand, fully biodegradable TENGs are largely unexplored, as well as many applications, such as blue energy harvesting, the internet of things, and others. The next steps in this line of research must focus on addressing the main challenges of hydrogel‐based TENGs and filling the application knowledge gaps.

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“…Further to the focus on the choice of materials, ionic liquids induce ionic polarization, enhancing dielectric constant and thus triboelectric performance and ionic conductivity. [44][45][46][47][48] Recent report describes the introduction of ionic liquid to fluorinated networks to improve TENG output through enhanced ionic polarization induced from iondipole interactions of pendant fluorinated groups with ionic liquids. 49 In this work, we have explored a reactive block copolymer approach to fabricate dynamic fluorinated poly(hindered urea) (PHU) network materials containing ionic liquids as effective self-healable negative triboelectric materials.…”

Section: Introductionmentioning

confidence: 99%