scholarly journals Optimizing energy harvesting performance of silicone elastomers by molecular grafting of azobenzene to the macromolecular network

RSC Advances ◽  
2021 ◽  
Vol 11 (31) ◽  
pp. 19088-19094
Author(s):  
Min Gong ◽  
Feilong Song ◽  
Hejian Li ◽  
Xiang Lin ◽  
Jiaping Wang ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Energy Conversion ◽  
Conversion Efficiency ◽  
Silicone Rubber ◽  
Polymer Network ◽  
Energy Conversion Efficiency ◽  
Silicone Elastomers ◽  
The Matrix ◽  
Macromolecular Network

Homogeneous silicone rubber was prepared for DEG applications by molecular grafting of azobenzene to the polymer network. The energy conversion efficiency of the composite was optimized to 5.01%, increased by 150% compared to the matrix.

scholarly journals Analysis and optimal design of a vibration isolation system combined with electromagnetic energy harvester

2019 ◽  
Vol 30 (16) ◽  
pp. 2382-2395
Author(s):  
Uchenna Diala ◽  
SM Mahdi Mofidian ◽  
Zi-Qiang Lang ◽  
Hamzeh Bardaweel
Keyword(s):  
Energy Harvesting ◽  
Energy Conversion ◽  
Conversion Efficiency ◽  
Vibration Isolation ◽  
Energy Conversion Efficiency ◽  
Isolation System ◽  
Magnetic Components ◽  
Energy Harvesting System ◽  
Response Function Method ◽  
Conversion Efficiencies

This work investigates a vibration isolation energy harvesting system and studies its design to achieve an optimal performance. The system uses a combination of elastic and magnetic components to facilitate its dual functionality. A prototype of the vibration isolation energy harvesting device is fabricated and examined experimentally. A mathematical model is developed using first principle and analyzed using the output frequency response function method. Results from model analysis show an excellent agreement with experiment. Since any vibration isolation energy harvesting system is required to perform two functions simultaneously, optimization of the system is carried out to maximize energy conversion efficiency without jeopardizing the system’s vibration isolation performance. To the knowledge of the authors, this work is the first effort to tackle the issue of simultaneous vibration isolation energy harvesting using an analytical approach. Explicit analytical relationships describing the vibration isolation energy harvesting system transmissibility and energy conversion efficiency are developed. Results exhibit a maximum attainable energy conversion efficiency in the order of 1%. Results suggest that for low acceleration levels, lower damping values are favorable and yield higher conversion efficiencies and improved vibration isolation characteristics. At higher acceleration, there is a trade-off where lower damping values worsen vibration isolation but yield higher conversion efficiencies.

scholarly journals Design and dynamic analysis of integrated architecture for vibration energy harvesting including piezoelectric frame and mechanical amplifier

2021 ◽  
Author(s):  
Xiangjian Duan ◽  
Dongxing Cao ◽  
Xiaoguang Li ◽  
Yongjun Shen
Keyword(s):  
Energy Harvesting ◽  
Energy Conversion ◽  
Conversion Efficiency ◽  
Structural Parameters ◽  
Energy Conversion Efficiency ◽  
High Energy ◽  
Ambient Vibration ◽  
Vibration Energy ◽  
Variable Cross ◽  
Mechanical Amplification

AbstractVibration energy harvesters (VEHs) can transform ambient vibration energy to electricity and have been widely investigated as promising self-powered devices for wireless sensor networks, wearable sensors, and applications of a micro-electro-mechanical system (MEMS). However, the ambient vibration is always too weak to hinder the high energy conversion efficiency. In this paper, the integrated frame composed of piezoelectric beams and mechanical amplifiers is proposed to improve the energy conversion efficiency of a VEH. First, the initial structures of a piezoelectric frame (PF) and an amplification frame (AF) are designed. The dynamic model is then established to analyze the influence of key structural parameters on the mechanical amplification factor. Finite element simulation is conducted to study the energy harvesting performance, where the stiffness characteristics and power output in the cases of series and parallel load resistance are discussed in detail. Furthermore, piezoelectric beams with variable cross-sections are introduced to optimize and improve the energy harvesting efficiency. Advantages of the PF with the AF are illustrated by comparison with conventional piezoelectric cantilever beams. The results show that the proposed integrated VEH has a good mechanical amplification capability and is more suitable for low-frequency vibration conditions.

2D WS2 Embedded PVDF Nanocomposites for Photosensitive Piezoelectric Nanogenerators with a Colossal Energy Conversion Efficiency ~ 25.6%

Nanoscale ◽  
2021 ◽  
Author(s):  
Didhiti Bhattacharya ◽  
Sayan Bayan ◽  
Rajib K Mitra ◽  
Samit K Ray
Keyword(s):  
Renewable Energy ◽  
Energy Harvesting ◽  
Energy Conversion ◽  
Conversion Efficiency ◽  
Low Cost ◽  
Energy Conversion Efficiency ◽  
Light Weight ◽  
Piezoelectric Nanogenerators

Benefited with the advantage of low cost, light weight and mechanical flexibility, piezoelectric nanogenerators have potential for applications in renewable energy harvesting from various unexplored sources. Here we report the...

An Investigation of Energy Harvesting Using Electrostrictive Polymers

2005 ◽  
Vol 889 ◽  
Author(s):  
Kailiang Ren ◽  
Yiming Liu ◽  
Heath F Hofmann ◽  
Qiming Zhang
Keyword(s):  
Energy Density ◽  
Energy Harvesting ◽  
Energy Conversion ◽  
Conversion Efficiency ◽  
Electromechanical Coupling ◽  
Electrical Energy ◽  
Energy Conversion Efficiency ◽  
Unique Property ◽  
Elastic Energy Density ◽  
Ac Field

ABSTRACTOwing to their low acoustic impedance, high elastic energy density, and relatively high electromechanical conversion efficiency, the electroactive polymers have begun to show the potential for energy harvesting or mechanical to electrical energy conversion. In addition, due to the electromechanical coupling in these materials the electric and mechanical properties of these polymers will depend on the imposed electrical and mechanical conditions. This paper discusses how to utilizing this unique property to maximum the energy conversion efficiency and the harvested electrical energy density in the electrostrictive polymers. As an example, we demonstrate that when a properly phased and externally applied electric AC field is superimposed on the mechanical cycle, an output electrical energy density of 39mJ/cm3 and mechanical-to-electrical conversion efficiency of about 10% can be obtained from the electrostrictive P(VDF-TrFE) based polymers.

Significant piezoelectric and energy harvesting enhancement of poly(vinylidene fluoride)/polypeptide fiber composites prepared through near-field electrospinning

2015 ◽  
Vol 3 (13) ◽  
pp. 6835-6843 ◽  
Author(s):  
Cheng-Tang Pan ◽  
Chung-Kun Yen ◽  
Hui-Chun Wu ◽  
Liwei Lin ◽  
Yi-Syuan Lu ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Energy Conversion ◽  
Conversion Efficiency ◽  
Energy Harvester ◽  
Vinylidene Fluoride ◽  
Near Field ◽  
Energy Conversion Efficiency ◽  
Fiber Composites ◽  
Poly Vinylidene Fluoride ◽  
Electromechanical Energy

A flexible PVDF/PMLG energy harvester captures electromechanical energy and its energy conversion efficiency was up to three times higher than individual PVDF and PMLG.

First-principles study on the electronic and optical properties of the orthorhombic CsPbBr3 and CsPbI3 with Cmcm space group

2021 ◽  
Author(s):  
Xianhao Zhao ◽  
Tianyu Tang ◽  
Quan Xie ◽  
like gao ◽  
Limin Lu ◽  
...  
Keyword(s):  
Optical Properties ◽  
Solar Cells ◽  
Energy Conversion ◽  
Conversion Efficiency ◽  
First Principles ◽  
Energy Conversion Efficiency ◽  
Space Group ◽  
Absorbing Materials ◽  
Halide Perovskites ◽  
Lead Halide

The cesium lead halide perovskites are regarded as effective candidates for light-absorbing materials in solar cells, which have shown excellent performances in experiments such as promising energy conversion efficiency. In...

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