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Electrospun ZnSnO_(3)/PVDF‑HFP Nanofibrous Triboelectric Films for Efficient mechanical energy harvesting

Advanced Fiber Materials 2023年第5期5卷 1685-1698页

作者： Venkata Siva Kavarthapu Sontyana Adonijah Graham Punnarao Manchi Mandar Vasant Paranjape Jae Su Yu Department of Electronics and Information Convergence Engineering Institute for Wearable Convergence ElectronicsKyung Hee University1732 Deogyeong‑daeroGiheung‑guYongin‑SiGyeonggi‑do 17104Republic of Korea

Nowadays,triboelectric nanogenerators(TENGs)are one of the most emerging technologies owing to their easy and costeffective device *** can harvest mechanical energy from our living ***,we synthesized dielectric zinc tin oxide(ZnSnO_(3))nanoparticles(NPs)by a hydrothermal *** ZnSnO_(3)NPs provide a dielectric and piezoelectric effect,which can efficiently enhance the output electrical performance of the proposed *** prepared ZnSnO_(3)NPs were embedded into a polyvinylidene fluoride hexafluoropropylene(PVDF-HFP)polymer to prepare ZnSnO_(3)/PVDF-HFP nanofibrous films to fabricate a *** output performance of TENG was investigated and optimized by varying the loading concentration of ZnSnO_(3)NPs in PVDF-HFP fibrous *** highest voltage,current,charge density,and power density from the fabricated TENG were achieved as~138 V,~5μA,~52μC/m2,and~1.6 W/m2,***,the robustness of the TENG was studied via the long-term mechanical stability ***,the practical and real-time application of the TENG was demonstrated by harvesting mechanical energy to power low-power portable electronic ***,the materials used in the TENG were combined into a skipping rope to harvest biomechanical/mechanical energy while exercising.

关键词： s ZnSnO_(3)nanoparticles ZnSnO_(3)/PVDF-HFP fibrous films Triboelectric nanogenerators mechanical energy harvesting

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Piezoionics:mechanical-to-ionic transduction for sensing,biointerface,and energy harvesting

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Aggregate 2024年第1期5卷 85-94页

作者： Kongqi Chen Derek Ho Department of Materials Science and Engineering City University of Hong KongHong KongChina Hong Kong Center for Cerebro-Cardiovascular Health Engineering Hong KongChina

Piezoionic materials consisting of a polymer matrix and mobile ions can produce an electrical output upon an applied pressure inducing an ion concentration *** from charges generated by the piezoelectric or triboelectric effects,the use of generated mobile ions to carry a signal closely resembles many ionic biological *** to this similarity to biology,the piezoionic effect has great potential to enable seamless integration with biological systems,which accelerates the advancement of medical devices and personalized *** this review,a comprehensive description of the piezoionic mechanism,methods,and applications are presented,with the aim to facilitate a dialogue among relevant scientific ***,the piezoionic effect is briefly introduced,then the development of mechanistic understanding over time is ***,different types of piezoionic materials are reviewed and methods to enhance the piezoionic output via materials properties,electrode interfaces,and device architectures are ***,applications,challenges,and outlooks are *** its novel properties,piezoionics is expected to play a key role in the overcoming of grand challenges in the areas of sensing,biointerfaces,and energy harvesting.

关键词： flexible electronics intelligent soft matter ionic hydrogel iontronics mechanical energy harvesting

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Flexible multilayer MEMS coils and their application in energy harvesters

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Science China(Technological Sciences) 2024年第4期67卷 1282-1293页

作者： ZHANG Jie HOU XiaoJuan QIAN Shuo BI XiaoXue HU DongXu LIU JianJun GENG WenPing MU JiLiang HE Jian CHOU XiuJian Science and Technology on Electronic Test and Measurement Laboratory North University of ChinaTaiyuan 030051China School of Software North University of ChinaTaiyuan 030051China

Electromagnetic vibration energy harvesters are promising for the power supply of wireless sensor nodes,small electronic devices,and wearable *** electromagnetic harvesters usually increase output by increasing the size of coils and magnets,limiting the improvement of energy conversion efficiency and power *** this study,multilayer microelectromechanical system(MEMS)coils were prepared using flexible electronics,and their high integration performance in arbitrary space was utilized to greatly improve the utilization of the space magnetic field by the electromagnetic *** core magnet of the generator was magnetically balanced to achieve levitation,which improved the sensitivity and reduced fatigue damage compared with traditional spring *** wound coils on the top and bottom of the magnet and the flexible coils on the sides worked together to improve the energy efficiency and output of the *** output performance of the device with different number distributions was simulated using mathematical models to obtain the optimal structural *** results show that by introducing flexible multilayer MEMS coils on the side surface of the energy harvester,the open-circuit voltage of the energy generators increased from 7 to 10 V by more than 43%.Flexible multilayer MEMS coils can enhance energy conversion rates and possess compact dimensions,making them suitable for integration onto complex *** the vibration energy harvesting system testing,the maximum peak power of the harvester was 7.1 m W at an acceleration of1 g and a resonant frequency of 11 Hz with a resistor of 3.5 kΩinternal ***,a 470μF capacitor can be charged to 3.5 V within 10 s to drive a hygrothermograph to work for more than 80 s and can supply a light bulb *** strategy shows the great potential of vibration-energy-driven electromagnetic generators for powering small electronics in limited spaces.

关键词： electromagnetic harvester mechanical energy harvesting multilayer MEMS coils magnetic levitation overall space magnetic field flexible planar coils

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Recent progress on flexible nanogenerators toward self-powered systems

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InfoMat 2020年第2期2卷 318-340页

作者： Yiming Liu Lingyun Wang Ling Zhao Xinge Yu Yunlong Zi Department of Biomedical Engineering City University of Hong KongHong KongPeople's Republic of China Department of mechanical and Automation Engineering Chinese University of Hong KongHong KongPeople's Republic of China

The advances in wearable/flexible electronics have triggered tremendous demands for flexible power sources,where flexible nanogenerators,capable of converting mechanical energy into electricity,demonstrate its great ***,recent progress on flexible nanogenerators for mechanical energy harvesting toward self-powered systems,including flexible piezoelectric and triboelectric nanogenerator,is *** emphasis is mainly on the basic working principle,the newly developed materials and structural design as well as associated typical applications for energy harvesting,sensing,and selfpowered *** addition,the progress of flexible hybrid nanogenerator in terms of its applications is also ***,the challenges and future perspectives toward flexible self-powered systems are reviewed.

关键词： flexible systems hybrid nanogenerator mechanical energy harvesting piezoelectric nanogenerator self-powered system triboelectric nanogenerator

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