Tuneable resonance frequency vibrational energy harvester with electret‐embedded variable capacitor

Ma, Xikui; Xin, Yang; Seggern, Heinz von; Dai, Ying; He, Pan; Sessler, G. M.; Zhang, Xiaoqing

doi:10.1049/nde2.12007

Cited by 8 publications

(8 citation statements)

References 40 publications

(73 reference statements)

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“…The preparation of the highly elastic FEP electret film includes a template-based hot-pressing process to form a wavy structure and a polarisation process to deposit negative charges on it [ 19,20,31,36]. Figure 5a presents the optical image of a prepared resilient FEP electret film.…”

Section: Experimental Workmentioning

confidence: 99%

“…Generally, an electrostatic vibrational energy harvester utilizes a variable capacitor as the transduction element which is either charged by an external bias voltage or embedded with electrets [17][18][19][20]. For the homocharge electret polymer films which are often utilized in electrostatic energy harvesters, the typical value of the effective surface charge density ranges from 0.1 to 1 mC/m 2 .…”

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confidence: 99%

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Resilient electret film‐based vibrational energy harvesters with a V‐shaped counter electrode

Xin

Ding

et al. 2023

IET Nanodielectrics

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Vibrational energy harvesters, which can convert mechanical energy distributed widely in the surrounding environment to electrical energy in a convenient, eco-friendly and sustainable way, have attracted great attention in both academia and industry. In this study, a resilient electret film-based vibrational energy harvester with a V-shaped counter electrode is introduced, simulated and constructed. A negatively charged fluorinated polyethylene propylene (FEP) electret film with a wavy shape was adopted in the devices, achieving simultaneously a stable embedded biased voltage and a large tensile deformation during vibration. The influences of the factors on the performance of the device, including the initial stretching state of the resilient electret film, seismic mass and depth of the V-shape counter electrode, were analyzed comprehensively with finite element simulation and compared to experiments. Further, the structure of the device was optimised for generating a high output power, and a good agreement between the simulation and experimental data was achieved. Additionally, the resonant frequency of the device can be easily tuned between 28 and 68 Hz by merely adjusting the initial stretching state of the wavy FEP electret film, guaranteeing great superiority for broad bandwidth energy harvesting applications. For an optimised energy harvester with a volume of only 15 � 5 � 1.7 mm 3 and a tiny seismic mass of 25 mg, and a normalized output power referring to 1 � g (g is the gravity of the Earth) up to 547 μW was obtained at its resonant frequency of 28 Hz. These results demonstrate that such a miniaturised vibrational energy harvester is a promising electrical energy supplier for low-power-consumption electronic devices, in particular in wireless sensor networks. K E Y W O R D Sresilient electret film, tunable resonant frequency, V-shaped counter electrode, vibrational energy harvesting | INTRODUCTIONVibrational energy is one of the ubiquitous and easily harvested mechanical energy sources in the environment [1-6]. Various electromagnetic, piezoelectric and electrostatic energy harvesters have been designed [7][8][9][10] to provide sustainable energy for low-power electronic devices [11][12][13] by converting mechanical vibrational energy into electrical energy [14-16], enabling convenient self-powered automation functions.Xiaoya Yang and Xingchen Ma authors contributed equally.

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Section: Experimental Workmentioning

confidence: 99%

mentioning

confidence: 99%

Resilient electret film‐based vibrational energy harvesters with a V‐shaped counter electrode

Xin

Ding

et al. 2023

IET Nanodielectrics

Self Cite

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“…With the changes in RH, temperature and wind speed, the U oc of IL-GO/GO@PVA aerogels also show ladder-like changes (Figure 5c-e), indicating that the MEGs system can recognize different environments. [52][53][54] A self-powered strain sensing device is fabricated by encapsulating the aerogel containing water with polydimethylsuloxane. From Figures S39 and S40 (Supporting Information), when pressure is applied to the self-powered sensor, the water molecules in the aerogel are discharged, realizing the unidirectional flow of water molecules and generating voltage output in the self-powered sensor.…”

Section: Applicationsmentioning

confidence: 99%

Biomimetic Aerogel for Moisture‐Induced Energy Harvesting and Self‐Powered Electronic Skin

Zhang

Wang

et al. 2022

Adv Funct Materials

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Moisture–electric generator (MEG)‐based blue energy is widely studied. There is still a significant challenge in improving the power of the MEGs system and expanding its application in self‐powered electronic skin. Inspired by the structure of ferns, a biomimetic moisture–electric aerogel is designed to collect energy. Polyvinyl alcohol dendritic colloids act as “roots” and “stems” to provide support and channels to transport water molecules. Meanwhile, “leaf‐like” graphene oxide sheets generate electricity through direct interaction with water. Besides, based on the above biomimetic structure, this work further enhances the output performance of MEGs by increasing the specific surface area (120.4 m2 g−1) and introducing an ultra‐high ion density gradient (from −35 to +37 mV). Meanwhile, due to the excellent water absorption, the MEGs show good salt resistance and cyclic stability. By constructing unique biomimetic structures, ultra‐high ion density gradient, and regulating environmental conditions, a high‐performance MEG is obtained, including ultra‐high open‐circuit voltage (1.9 V) and short‐circuit current (82.5 µA), the industry‐leading power density among MEGs with continuous output is reported in the literature (22.55 µW cm−2). Besides, the MEGs can accurately respond to environmental and pressure changes, showing its application potential in self‐powered electronic skin.

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“…Permanently charged electrets with a solid film [ 1 , 2 ] or cellular structure [ 3 , 4 ] are insulating dielectric materials that exhibit a net quasi-permanent electrical charge or dipole moment. These electrets carrying trapped charges with strong electrostatic or piezoelectric effects have been widely used in microsystems such as pressure or tactile sensors [ 5 ], accelerometers [ 6 ], energy harvesters [ 7 , 8 , 9 ], and actuators [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Understanding the Role of Soft X-ray in Charging Solid-Film and Cellular Electrets

et al. 2022

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Solid-film electrets and cellular electrets are defined as promising insulating dielectric materials containing permanent electrostatic and polarizations. High-performance charging methods are critical for electret transducers. Unlike dielectric barrier discharge (DBD) charging, the soft X-ray charging method, with its strong penetration ability, has been widely used in electrets after packaging and has even been embedded in high-aspect-ratio structures (HARSs). However, the related charging model and the charging effect of the soft X-ray irradiation remain unclear. In this study, the charge carrier migration theory and the one-dimensional electrostatic model were employed to build the soft X-ray charging models. The influence of soft X-ray irradiation under deferent poling voltages was investigated theoretically and experimentally. The conducted space charge measurement based on a pulsed electro-acoustic (PEA) system with a soft X-ray generator revealed that soft X-ray charging can offer higher surface charge densities and piezoelectricity to cellular electrets under the critical poling voltage lower than twice the breakdown voltage.

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Tuneable resonance frequency vibrational energy harvester with electret‐embedded variable capacitor

Cited by 8 publications

References 40 publications

Resilient electret film‐based vibrational energy harvesters with a V‐shaped counter electrode

Resilient electret film‐based vibrational energy harvesters with a V‐shaped counter electrode

Biomimetic Aerogel for Moisture‐Induced Energy Harvesting and Self‐Powered Electronic Skin

Understanding the Role of Soft X-ray in Charging Solid-Film and Cellular Electrets

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