A novel soft encapsulated multi-directional and multi-modal piezoelectric vibration energy harvester

Cao, Dongxing; Lu, Yi-Ming; Lai, Shih-Kung; Mao, Jiajia; Guo, Xiaoqin; Shen, Yongjun

doi:10.1016/j.energy.2022.124309

Cited by 11 publications

(5 citation statements)

References 41 publications

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“…Soft silicone gel, due to the low elastic modulus, is utilized to encapsulate the 3D piezoelectric unit, which can be regarded as the defect unit of a 3D phononic crystal. The detailed encapsulating process can be found in the previous work [32]. The buckled 3D piezoelectric unit is placed in a preset container.…”

Section: Design Of Soft Buckling-driven Assembling Piezoelectric Unitsmentioning

confidence: 99%

“…Sun et al [31] studied a flexural structure with a cutting process to achieve the mechanical coupling of four cantilever beam structures for multimodal and multidirectional vibrational energy harvesting. Cao et al [32] proposed a mechanically guided 3D assembly structure consisting of a compressive buckling cruciform structure with a proof mass, polyvinylidene fluoride (PVDF) thin film, and soft encapsulation. The results demonstrated that the encapsulated structure worked well under multidirectional, multimodal, and low-frequency conditions.…”

Section: Introductionmentioning

confidence: 99%

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Buckling-driven piezoelectric defect-induced energy localization and harvesting using a Rubik’s cube-inspired phononic crystal structure

Cao,

Li,

Guo

et al. 2024

Smart Mater. Struct.

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Wireless sensor networks that enable advanced Internet of Things (IoT) applications have experienced significant development. However, low-power electronics are limited by battery lifetime. Energy harvesting presents a solution for self-powered technologies. Vibration-based energy harvesting technology is one of the effective approaches to convert ambient mechanical energy into electrical energy. Various dynamic oscillating systems have been proposed to investigate the effectiveness of energizing low-power electronic sensor devices for supporting various IoT applications across engineering disciplines. Phononic crystal structures have been implemented in vibrational energy harvesters due to their unique bandgap and wave propagation properties. This work proposes a Rubik’s cube-inspired defective-state locally resonant three-dimensional (3D) phononic crystal with a 5×5×5 perfect supercell that contains 3D piezoelectric energy harvesting units. The advantage of defect-induced energy localization is utilized to harness vibrational energy. The 3D piezoelectric energy harvesting units are constructed by the buckling-driven assembling principle. Adapting to the low-frequency and broadband characteristics of ambient vibration sources, soft silicone gel is used to encapsulate the buckled 3D piezoelectric units, which are embedded in the 3D cubic phononic crystal to assemble an entire system. The energy harvesting performance of various defective layouts and their defect modes is discussed. The results demonstrate that the harvester functions well under multidirectional, multimodal, and low-frequency conditions. The proposed methodology also offers a new perspective on vibrational energy harvesters for defective phononic crystals with superior working performance.

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Section: Design Of Soft Buckling-driven Assembling Piezoelectric Unitsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Buckling-driven piezoelectric defect-induced energy localization and harvesting using a Rubik’s cube-inspired phononic crystal structure

Cao,

Li,

Guo

et al. 2024

Smart Mater. Struct.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Parida et al (2012), Marjanović-Balaban and Jelić (2018) discussed various biomaterials for IMDs. Cao et al (2022) presented a soft encapsulation for PEHs that was suited for 2D and 3D structures without affecting the performance of the harvester.…”

Section: Reviewmentioning

confidence: 99%

Recent advancements in piezoelectric energy harvesting for implantable medical devices

Upendra,

Panigrahi,

Singh

et al. 2023

Journal of Intelligent Material Systems and Structures

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Biomedical implantable devices like deep brain stimulators, implantable cardioverter-defibrillators and cardiac pacemakers are essential for treating the human heart and brain-related diseases. In the past few decades, a considerable amount of research has focused on improving bio-implant technologies. Conventional bio implant devices consist of an external generator like a battery to power the system, which requires replacement after a particular time. Therefore, in recent years, self-powered implants with various energy harvesting techniques have been proposed to avoid frequent surgery for battery replacement and to miniaturise the implant systems. However, the research communities have yet to explore all the limitations and possibilities of improvement on such energy-scavenging technologies, especially when the application is in vivo. Several aspects of recent developments in energy harvesting technologies feasible for biomedical implantable devices are reported systematically. A detailed review of piezoelectric energy harvester mechanism and miniaturisation, electric output and power management and biocompatibility of an energy harvester for implantable medical devices in vitro and in vivo environments. Furthermore, the piezoelectric energy harvester’s durability, packaging material, connection and evaluation criteria are discussed.

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“…The intrinsic frequency of PEH prepared with piezoelectric ceramics and rigid materials is usually in the kHz range, and the response to low-frequency vibration is weak, which restricts its applications in human motion and environmental vibration [2,4,[21][22][23]. To decrease the intrinsic frequency of PEH, fPEHs based on flexible materials with low Young's modulus, including piezoelectric materials and structural materials [24,25] were widely studied. Kim et al proposed a flexible piezoelectric strain energy harvester composed of PVDF and polydimethylsiloxane (PDMS) frame, which can respond to multi-directional forces generated by various human movements [6].…”

Section: Introductionmentioning

confidence: 99%

“…Kim et al proposed a flexible piezoelectric strain energy harvester composed of PVDF and polydimethylsiloxane (PDMS) frame, which can respond to multi-directional forces generated by various human movements [6]. The maximum excitation output peak voltage at 4 N (2 Hz) at 0 • angle can reach 1.75 V with the corresponding power of 0.064 W. Cao et al designed a PEH with a mechanically guided 3D assembly structure and a soft cruciform package [25]. The compressed flexion cruciform structure was integrated with PVDF film and immersed in liquid silica gel for the package.…”

Section: Introductionmentioning

confidence: 99%

A poly(L-lactic Acid)-based flexible piezoelectric energy harvester with micro-zigzag structures

Liu,

Xue,

et al. 2024

Smart Mater. Struct.

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Piezoelectric energy harvester (PEH) holds great potential for flexible electronics and wearable devices. However, the power conversion efficiency of flexible PEH (fPEH) has often been a limiting factor, especially under variable excitation. Herein, we propose a practical solution: a poly(L-lactic acid)-based fPEH with 3D-printed micro-zigzag structures. This design not only broadens the operational bandwidth and enhances low-frequency response but also offers a tangible improvement in the power conversion efficiency of fPEH. The micro-zigzag structure was designed and fabricated using a digital light processing 3D printing technique with acrylates, a method that is readily accessible to researchers and engineers in the field. Mechanical properties of the 3D-printed acrylic elastomers with different compositions were investigated to obtain the material parameters, and then fPEH with the sandwich structure was fabricated via sputtering and packaging. Subsequently, numerical simulation was conducted on the micro-zigzag structures to determine the structure sizes and oscillation frequencies of fPEH. Finally, four micro-zigzag structures with 3-, 4-, 5- and 6-mm lengths were tested to obtain oscillation frequencies of 51, 37, 22, and 21 Hz consistent with the simulation. The output voltages of fPEH are 11 ~ 30 mV with the load ranges of 60 ~ 100 MΩ. Stability evaluation showed that the fPEH can work under low frequency (<100 Hz) and broadband conditions. The micro-zigzag structure provided new insights for the design of fPEH, paving the way for more efficient and practical energy harvesting solutions in the future.

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A novel soft encapsulated multi-directional and multi-modal piezoelectric vibration energy harvester

Cited by 11 publications

References 41 publications

Buckling-driven piezoelectric defect-induced energy localization and harvesting using a Rubik’s cube-inspired phononic crystal structure

Buckling-driven piezoelectric defect-induced energy localization and harvesting using a Rubik’s cube-inspired phononic crystal structure

Recent advancements in piezoelectric energy harvesting for implantable medical devices

A poly(L-lactic Acid)-based flexible piezoelectric energy harvester with micro-zigzag structures

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