Spray-coated electret materials with enhanced stability in a harsh environment for an MEMS energy harvesting device

Han

et al. 2023

Energy Environ. Sci.

Section: Papermentioning

confidence: 99%

Electric-field-driven interfacial trapping of drifting triboelectric charges via contact electrification

Han

et al. 2023

Energy Environ. Sci.

“…It can be easily incorporated into systems without using any large storage space. [45][46][47][48][49][50][51][52] Bourouina et al, in Figure 4a, reported a silicon-based MEMS electrostatic transducer for vibration energy harvesting to obtain a functional device using electret materials in microsystems. [45] They demonstrated that 61 nW was obtained at a 0.25 g vibration level at 250 Hz.…”

Section: Mems-based Devicesmentioning

confidence: 99%

“…They demonstrated that the spray‐coated cyclic olefin copolymer can be well used in MEMS electret with ≈11.72 W power output at an acceleration of 28.5 m s −2 . [ 52 ] Herein, Table 2 concludes the key parameters of the MEMS‐based electret device for energy harvesting.…”

Section: From Energy Harvesting To Its Enhancementmentioning

confidence: 99%

See 1 more Smart Citation

More Than Energy Harvesting in Electret Electronics‐Moving toward Next‐Generation Functional System

Zhu

Yang

Zhang

et al. 2023

Adv Funct Materials

Electrets are normally applied for energy conversion from mechanical vibration sources in the environment to electrical power without any friction, which induces electric device sustainability and mechanically robust. It functions for electron storage and electrostatic/triboelectric effect, whose electrical/mechanical performance dramatically benefits energy harvesters, self‐powered sensors, and even intelligent/sustainable systems. To summarize the progress of electret‐based electronics, this review proposes three key issues around enhanced energy harvesting toward sensors and sustainable systems. First, with the properties of long‐term charge storage characteristics and the contactless mechanism for energy harvesting, the enhancement effect in electret from MEMS devices, porous microstructure devices, and multilayer electret devices are carefully assessed with the output power from various devices. Second, the multi‐functional applications aspect along with the triboelectric coupling effect and artificial piezoelectric materials are discussed as future electret devices, for example, polydimethylsiloxane materials. Third, more than energy harvesting, machine learning‐enabled methodology in electret electronics can be more reliable and sustainable, dramatically contributing to the living standard of the society. Electret technologies on the future development trends are finally analyzed and strengthened toward multifunctional, sustainable, and intelligent systems along with the upcoming technologies in coupling mechanism, artificial composite materials, and machine learning in data fusion.

“…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 . The electrostatic energy harvesters embedded with electrets have captured much attention given their features such as self-powered capability (no bias voltage required), compatibility with MEMS processes, high conversion efficiency, simple implementation and eco-friendliness [21][22][23][24][25][26][27][28].…”

mentioning

confidence: 99%

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

Xin

Ding

et al. 2023

IET Nanodielectrics

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.