Towards truly wearable energy harvesters with full structural integrity of fiber materials

Gong, Jinlong; Xu, Bingang; Guan, Xiaoyang; Chen, Yuejiao; Li, Shengyan; Feng, Jie

doi:10.1016/j.nanoen.2019.01.056

Cited by 76 publications

(63 citation statements)

References 41 publications

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“…Therefore, it is widely adopted to design 3D fabric‐based TENGs. For example, a new kind of 3D fabric‐based TENG was fabricated with three types of fibers by a computerized knitting strategy . As illustrated in Figure a, the top and bottom fabric layers were knitted from Ag‐coated nylon fibers and PAN fibers, respectively.…”

Section: Triboelectric Nanogeneratorsmentioning

confidence: 99%

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Fiber/Fabric‐Based Piezoelectric and Triboelectric Nanogenerators for Flexible/Stretchable and Wearable Electronics and Artificial Intelligence

2019

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fields is breaking out, such as the Internet of Things (IoTs), big data, humanoid robotics, and artificial intelligence (AI). Nowadays, the rapid advancement of these functional electronic devices is transforming the way people communicate with each other and with their surroundings, which has integrated our world into an intelligent information network. Owing to that no electronics works without electricity, the processes of human informatization and intelligence depend on broad energy supplies and powerful power supports. In other words, electric power can be regarded as the flowing blood that keeps every components of the current society running normally and healthily. However, with the rapid consumption of conventional fossil fuels as well as the growing voice of environmental protection, the current energy structure and its supply status are facing unprecedented challenges. On the one hand, the overwhelming energy crisis and ecological deterioration have become huge bottlenecks restricting socioeconomic development.[1] Some serious situations may even worsen to the root of interstate interest conflicts or the disaster that threatens the survival of mankind. In this case, the transform of energy structure from scarce, pollution-prone, and irreproducible mineral resources to abundant, environmentally friendly, and renewable green energies is desperately required. On the other hand, the traditional centralized, immobile, and ordered energy supply patterns based on power plants are incompatible with the present development of functional electronics associated with individual person, which follows a general trend of miniaturization, portability, and low power. As the information age is coming, billions of things must be connected with sensors for various measurements, perceptions, controls, and data transmissions. [2] These mobile, human-oriented, randomly and massively distributed sensing networks also require the corresponding matched power supply system. Therefore, it turns out that the unreasonable energy structures as well as the mismatched supply pattern lead to the current development dilemma.Portable power supplies and self-powered systems are the most promising solutions for the above straits. For wearable power sources, one of the compromises is to choose small-size Integration of advanced nanogenerator technology with conventional textile processes fosters the emergence of textile-based nanogenerators (NGs), which will inevitably promote the rapid development and widespread applications of next-generation wearable electronics and multifaceted artificial intelligence systems. NGs endow smart textiles with mechanical energy harvesting and multifunctional self-powered sensing capabilities, while textiles provide a versatile flexible design carrier and extensive wearable application platform for their development. However, due to the lack of an effective interactive platform and communication channel between researchers specializing in NGs and those good at textiles, it is rather difficult to achieve fiber...

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Section: Triboelectric Nanogeneratorsmentioning

confidence: 99%

Section: Triboelectric Nanogeneratorsmentioning

confidence: 99%

Fiber/Fabric‐Based Piezoelectric and Triboelectric Nanogenerators for Flexible/Stretchable and Wearable Electronics and Artificial Intelligence

2019

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“…As a matter of fact, for flexible and wearable devices, the typical textile processing techniques [26][27][28][29][30], such as knitting, weaving, and embroidering, are rarely reported for integrating with the applications. Instead, more works paid their attention to the pure synthesis of the electroactive materials [31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Toward Flexible and Wearable Embroidered Supercapacitors from Cobalt Phosphides-Decorated Conductive Fibers

Wen

Zhou

2019

Nano-Micro Lett.

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HIGHLIGHTS• The conductive silver-plated nylon yarns fully fit the demand for wearable supercapacitor skeleton, owing to the advantages of high conductivity and flexibility.• The computerized programming embroidering technique was firstly applied for realizing standardized batch processing of the flexible supercapacitor skeleton in various patterns.• Cobalt phosphides were properly electrodeposited on the conductive embroidery as the pseudocapacitive materials, providing remarkable electrochemical performance. ABSTRACT Wearable supercapacitors (SCs)are gaining prominence as portable energy storage devices. To develop high-performance wearable SCs, the significant relationship among material, structure, and performance inspired us with a delicate design of the highly wearable embroidered supercapacitors made from the conductive fibers composited. By rendering the conductive interdigitally patterned embroidery as both the current collector and skeleton for the SCs, the novel pseudocapacitive material cobalt phosphides were then successfully electrodeposited, forming the first flexible and wearable in-plane embroidery SCs. The electrochemical measurements manifested that the highest specific capacitance was nearly 156.6 mF cm −2 (65.72 F g −1 ) at the current density of 0.6 mA cm −2 (0.25 A g −1 ), with a high energy density of 0.013 mWh cm −2 (5.55 Wh kg −1 ) at a power density of 0.24 mW cm −2 (100 W kg −1 ). As a demonstration, a monogrammed pattern was ingeniously designed and embroidered on the laboratory gown as the wearable in-plane SCs, which showed both decent electrochemical performance and excellent flexibility.

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“…The operational principle of VPAGs is like that of the reported triboelectric nanogenerators (TENGs) based on CE between nonadhesive surfaces. [2,[6][7][8][9][19][20][21][22][23] When an external load is connected between two electrodes (or shorted), free electrons will be driven to flow back and forth to build an opposite potential to balance the dynamic electrostatic field caused by the separation and contact processes of the electrified surfaces ( Figure S1, Supporting Information). These processes lead to the formation of alternating electric signals.…”

Section: Doi: 101002/adma201907948mentioning

confidence: 99%

“…Attempts to harvest this broadly present but wasted ambient mechanical energy as electric energy have been made using several kinds of materials with piezoelectric [ 3–5 ] or triboelectric properties. [ 6–9 ] These works are highly significant and valuable for diverse applications.…”

mentioning

confidence: 99%

An Adhesive Surface Enables High‐Performance Mechanical Energy Harvesting with Unique Frequency‐Insensitive and Pressure‐Enhanced Output Characteristics

Gong

Yang

et al. 2020

Advanced Materials

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Viscoelastic polymer adhesives (VPAs) are common materials broadly used in adhesive tapes for bonding objects tightly in daily life. This work presents a conceptually new strategy of using contact electrification (rather than strong adhesion) of VPAs to directly convert mechanical energy to electric energy, generally showing 202–419% of the electric energy generated by conventional mechanical energy harvesters under the same triggering conditions. More notably, the VPA‐based generators (VPAGs) possess unique frequency‐insensitive and pressure‐enhanced output characteristics. The output power of a VPAG not only does not show regular degradation of performance with the decrease of triggering frequency, but also can be further enhanced by simple introduction of a second VPA layer with a smaller area to increase the applied pressure without the requirement of rising applied force. The average output power density of a VPAG with a second layer of 0.5 cm × 0.5 cm can reach 216.7 µW cm−2, which is ≈150% larger than that of a VPAG without a second VPA layer. This research is of significance to harvesting the random, irregular, and low‐frequency (bio‐)mechanical energy that widely exists but is wasted in the environment for both stable electric energy generation and electronic device operation.

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Towards truly wearable energy harvesters with full structural integrity of fiber materials

Cited by 76 publications

References 41 publications

Fiber/Fabric‐Based Piezoelectric and Triboelectric Nanogenerators for Flexible/Stretchable and Wearable Electronics and Artificial Intelligence

Fiber/Fabric‐Based Piezoelectric and Triboelectric Nanogenerators for Flexible/Stretchable and Wearable Electronics and Artificial Intelligence

Toward Flexible and Wearable Embroidered Supercapacitors from Cobalt Phosphides-Decorated Conductive Fibers

An Adhesive Surface Enables High‐Performance Mechanical Energy Harvesting with Unique Frequency‐Insensitive and Pressure‐Enhanced Output Characteristics

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