Exploring the theoretical and experimental optimization of high-performance triboelectric nanogenerators using microarchitectured silk cocoon films

Triboelectric nanogenerators (TENGs) were first developed in 2012, and have become the desirable choice as energy harvesters in the research community worldwide. The popularity of TENGs is attributed to their low weight, low cost, high output, wide range of materials and device designs. TENGs have been explored for many applications including sensing, implantable power sources, healthcare, and biomedical applications. The performance of TENGs depends largely on the material since charge density (σ) is a material property. Moreover, 2D materials have been investigated as an alternative to the conventional metal electrodes. The dominance of polymers and metals in the traditional triboelectric series has lead researchers to explore novel materials to extend the applications and improve TENG output. This review article summarizes the progress in the development of frictional layers and electrode materials for TENGs. The mechanism for the output enhancement and device applications are discussed in detail. Finally, a perspective on the future and relevant challenges in material development for TENGs are discussed.

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Section: Natural Materialsmentioning

confidence: 99%

Materials Beyond Conventional Triboelectric Series for Fabrication and Applications of Triboelectric Nanogenerators

Khandelwal

Raj

Kim

2021

Advanced Energy Materials

171

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“…Apart from flexibility and biocompatibility, biodegradability is another key feature to be considered for mid‐ and short‐term implantable biomedical applications. [ 139 ] Natural materials, including silk, [ 140 ] plant leaves, [ 141 ] cellulose, [ 142 ] fish scales, [ 143 ] and wood, [ 144 ] are some of the ideal biodegradable candidates because they are low‐cost and easy to obtain. [ 145 ] As shown in Figure 7d, Jiang et al.…”

Section: Internal Energy‐harvesting Devicesmentioning

confidence: 99%

Recent Advances of Energy Solutions for Implantable Bioelectronics

Sheng

Zhang

Liang

et al. 2021

Adv Healthcare Materials

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The emerging field of implantable bioelectronics has attracted widespread attention in modern society because it can improve treatment outcomes, reduce healthcare costs, and lead to an improvement in the quality of life. However, their continuous operation is often limited by conventional bulky and rigid batteries with a limited lifespan, which must be surgically removed after completing their missions and/or replaced after being exhausted. Herein, this paper gives a comprehensive review of recent advances in nonconventional energy solutions for implantable bioelectronics, emphasizing the miniaturized, flexible, biocompatible, and biodegradable power devices. According to their source of energy, the promising alternative energy solutions are sorted into three main categories, including energy storage devices (batteries and supercapacitors), internal energy‐harvesting devices (including biofuel cells, piezoelectric/triboelectric energy harvesters, thermoelectric and biopotential power generators), and external wireless power transmission technologies (including inductive coupling/radiofrequency, ultrasound‐induced, and photovoltaic devices). Their fundamentals, materials strategies, structural design, output performances, animal experiments, and typical biomedical applications are also discussed. It is expected to offer complementary power sources to extend the battery lifetime of bioelectronics while acting as an independent power supply. Thereafter, the existing challenges and perspectives associated with these powering devices are also outlined, with a focus on implantable bioelectronics.

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“…Compared with that of PENGs, the working mechanism of triboelectric nanogenerators (TENGs) is that the combined effect of contact electrification and electrostatic induction harvests the mechanical energy from the environment and human motions, which have been applied in charging mobile phone batteries as direct power sources and powering self-powered active sensors (Figure 6B) (Wu and Wang, 2016). At present, a variety of commercial organic materials (such as nylon [Zhang et al, 2020a], cotton [Jeong et al, 2019], silk [Dudem et al, 2020], perfluoroalkoxy [Hinchet et al, 2019], and PVDF [Fang et al, 2011]) and inorganic materials (MoS 2 [Xue et al, 2016], TiO 2 [Lin et al, 2013], and Si [Yang et al, 2013a]) have been used to prepare fiber-shaped TENGs with excellent performances. Commonly, fiber-shaped TENGs are designed as coaxial or core-shell structures.…”

Section: Energy-harvesting Devicesmentioning

confidence: 99%

Electronic fibers and textiles: Recent progress and perspective

et al. 2021

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Wearable electronics are receiving increasing attention with the advances of human society and technologies. Among various types of wearable electronics, electronic fibers/textiles, which integrate the comfort and appearance of conventional fibers/textiles with the functions of electronic devices, are expected to play important roles in remote health monitoring, disease diagnosis/treatment, and human-machine interface. This article aims to review the recent advances in electronic fibers/textiles, thus providing a comprehensive guiding reference for future work. First, we review the selection of functional materials and fabrication strategies of fiber-shaped electronic devices with emphasis on the newly developed functional materials and technologies. Their applications in sensing, light emitting, energy harvest, and energy storage are discussed. Then, the fabrication strategies and applications of electronic textiles are summarized. Furthermore, the integration of multifunctional electronic textiles and their applications are summarized. Finally, we discuss the existing challenges and propose the future development of electronic fibers/textiles. INTRODUCTIONRecently, development of flexible and wearable electronics has been gradually prominent in our daily life (Park et al., 2018;Trung and Lee, 2016). Ideal wearable electronics possess characteristics of flexibility, light weight, easy to bind with human skin, and tolerating mechanical deformation, to satisfy the requirements of comfort and avoid interfering with normal activities of humans (Zeng et al., 2014). However, traditional electronics with high performance are mostly made of bulky and rigid inorganic materials, such as silicon or gallium arsenide, which are used for fabrication of complex planar circuits (Fan et al., 2008; Kim et al., 2009). The mechanical mismatch between rigid electronics and human skin has immensely prevented electronic devices from conformably attaching on the human body. Therefore, electronic devices are gradually developing toward flexibility and miniaturization to fulfill the requirements of wearing, and have developed from three dimensional (3D) rigid devices to low-dimensional and lightweight flexible devices. Electronics in forms of fibers and textiles, with advantages of good flexibility, light weight, breathability, and easiness of integration with traditional clothes, are one of the ideal form of wearables (Chatterjee et al., 2019).Although fibers have been used in human lives for thousands of years, the history of developing functional and intelligent fibers is not long. Before the emergence of flexible and wearable electronics, optical fibers and metal fibers were the representative functional fibers (Kao and Hockham, 1966;Wardclose and Partidge, 1990). Recently, with the progress of material science and nanotechnology, wearable electronic fibers/ textiles, including 1D fiber-shaped electronic devices (electronic fibers) and 2D/3D electronic textiles, which combine the flexibility and excellent mechanical properties of fib...

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Exploring the theoretical and experimental optimization of high-performance triboelectric nanogenerators using microarchitectured silk cocoon films

Cited by 68 publications

References 77 publications

Materials Beyond Conventional Triboelectric Series for Fabrication and Applications of Triboelectric Nanogenerators

Materials Beyond Conventional Triboelectric Series for Fabrication and Applications of Triboelectric Nanogenerators

Recent Advances of Energy Solutions for Implantable Bioelectronics

Electronic fibers and textiles: Recent progress and perspective

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