Sustainable highly charged C 60 -functionalized polyimide in a non-contact mode triboelectric nanogenerator

amount of mechanical energy into electrical energy but also have been utilized for self-powered sensor applications. [2][3][4][5][6][7][8][9][10][11] However, contact-separation-based TENG can lead to declining in the robustness and reliability of TENG due to wear and tear of materials, [12] replacement of the device, and noise resulting from the operation. [13] In this regard, non-contact mode TENG has emerged as a promising solution. [14][15][16][17] Lee et al. [18] reported a C 60 functionalized contactless TENG that demonstrates high output power and reliability. Similarly, Han et al. [19] reported calcium copper titanate (CCTO) as a high-dielectric material for improving the electrostatic discharge of a contactless TENG. However, the charge retention is still poor in the reported studies. Charge retention is a key parameter for the effectiveness of contactless TENG as there is no contact to generate the triboelectric charge. [20] In order to improve the charge retention of contactless TENG, several techniques have been utilized such as dielectric permittivity modulation, [21] surface patterning, [22] ion injection, [18] charge trapping layer, [23] and structural modification. [24] Among them, employing the charge trapping interlayer is a convenient method for improving charge retention owing to its easy fabrication process and cost-effectiveness. [25] The porous, insulating, and semi-conductive materials have been considered to be the suitable interlayer to trap the charges for improving the charge density and the output performance of TENG. [25,26] Hence, porous material such as laser-induced graphene (LIG) can be utilized which easily traps the charges owing to the presence of abundant charge traps. In addition, fillers such as molybdenum disulfide (MoS 2 ) can be incorporated into LIG which results in a high charge retention property due to improvement in dielectric property and polarization between the layers.Recently, two-dimensional (2D) materials such as black phosphorous, [27] reduced graphene oxide (rGO), [28] MXene, [29,30] Siloxene [31] have received significant attraction owing to their larger surface area which facilitates the accumulation of moreThe ORCID identification number(s) for the author(s) of this article can be found under

Section: Introductionmentioning

confidence: 99%

“…[ 14–17 ] Lee et al. [ 18 ] reported a C 60 functionalized contactless TENG that demonstrates high output power and reliability. Similarly, Han et al.…”

Section: Introductionmentioning

confidence: 99%

A Siloxene/Ecoflex Nanocomposite‐Based Triboelectric Nanogenerator with Enhanced Charge Retention by MoS₂/LIG for Self‐Powered Touchless Sensor Applications

Shrestha

Sharma

Pradhan

et al. 2022

“…Contact electrification (CE) is a well‐known TENG phenomenon in which equivalent amounts of opposite charges are produced on surfaces owing to the continuation of the contact and separation processes between two materials [ 1–4 ] However, the contact separation TENG mode may have some drawbacks, such as degradation of the reliability as well as the robustness of the TENG owing to the friction heat and wear of materials due to continuous operation and noise resulting from its operation, thereby driving the need to replace the device. [ 5 ] Recently, contactless TENGs have emerged as an alternative solution to these problems. [ 5–9 ] However, with increasing distance between the two surfaces, the electrical output is reduced.…”

Section: Introductionmentioning

confidence: 99%

“…[ 5 ] Recently, contactless TENGs have emerged as an alternative solution to these problems. [ 5–9 ] However, with increasing distance between the two surfaces, the electrical output is reduced. To improve the output performance of the contactless TENG, several efforts have been devoted, such as surface patterning, employing composite materials, dielectric permittivity modulation, ion injection, selection of triboelectric material, multiple dielectric layers, phase inversion, and structural optimization.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Cobalt‐Nanoporous Carbon Functionalized Nanocomposite‐Based Triboelectric Nanogenerator for Contactless and Sustainable Self‐Powered Sensor Systems

Rana

Zahed

Rahman

et al. 2021

Triboelectric nanogenerators (TENGs), which operate in contactless mode and avoid physical contact, are highly attractive for self-powered sensor systems aiming to achieve long-term reliable operation and reduce rubbing friction. Herein, an ultra-flexible and high-performance contactless doublelayer TENG (CDL-TENG) is first designed and fabricated using a metalorganic framework-based cobalt nanoporous carbon (Co-NPC)/Ecoflex with MXene/Ecoflex nanocomposite layer for self-powered sensor applications. The porous structure of the Co-NPC provides a high-surface-area of the nanocomposite and the charge storage layer of the MXene/Ecoflex nanocomposite accumulates more negative charge to improve the functionality of the CDL-TENG two and three times, respectively. Compared with Ecoflex film-based TENGs, the fabricated CDL-TENG exhibits an eight-fold slower decay rate owing to charge trapping characteristics, which were confirmed by surface potential measurements. The CDL-TENG shows excellent humidity and acceleration sensitivity of about 0.3 V/% and 2.06 Vs 2 m −1 . The CDL-TENG also offers non-contact position detection performance in the 20 cm range. Furthermore, the CDL-TENG is successfully integrated with mobile-vehicles and an intelligent robot to perform obstacle and humanmotion detection. Finally, a contactless door-lock password authentication system was demonstrated. These multifunctional benefits make it useful for numerous applications, including artificial intelligence, human-machine interfaces, and self-powered sensors.

Triboelectric Polymer with High Thermal Charge Stability for Harvesting Energy from 200 °C Flowing Air

Tao

Shi

et al. 2021

Due to the thermionic emission effect, the electron transferred to dielectric surface can be released into vacuum after the contact electrification (CE). Therefore, triboelectric nanogenerator (TENG) cannot maintain effective electrical output under high temperature conditions. In order to obtain high thermal charge stability, polyimide is modified with strong electron withdrawing groups like trifluoromethyl (CF 3 ) and sulfone group (SO 2 ) in backbone. The fluorinated polyimides (F-PI) with a big band gap can provide a tribocharge density of 170 µC m −2 (4 times of common Kapton film) and become more negative than polytetrafluoroethylene in triboelectric series. In addition, BaTiO 3 nanoparticles are doped in F-PI film for inducing deep traps and interfacial polarizations for CE, which can further enhance the charge density (200 µC m −2 ) and thermal charge stability. Finally, a flutter-driven TENG (FD-TENG) is designed based on this BaTiO 3 -doped F-PI film to harvest wind energy and sense wind velocity. This FD-TENG can maintain 32% of its output performance at 200 °C in comparison with room temperature, which is the highest thermal charge stability reported for triboelectric polymers. Therefore, this BaTiO 3 -doped F-PI has great application prospects for energy generation and motion detection in hot wind tunnel and many other harsh environments.