Internal-field-dependent low-frequency piezoelectric energy harvesting characteristics of in situ processed Nb-doped Pb(Zr,Ti)O3 thin-film cantilevers

Han, Chan Su; Liu, Kaihua; Kim, Ji Ho; Kang, Dong Heon; Cho, Yong Soo

doi:10.1016/j.jallcom.2018.12.141

Cited by 5 publications

(1 citation statement)

References 30 publications

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“…In order to expand the thus experimentally validated findings on the possibility of replacing a rectangular PEH with trapezoidal or inverse trapezoidal shapes, resulting in a substantial increase in specific power outputs [20], a numerical model is developed using ANSYS ® [3]. The damping coefficients required in the carried finite element (FE) analyses are determined here via uncoupled modal analyses, while, due to the complex interactions induced by the forward and backwards electromechanical coupling effects, the optimal load resistance values are determined via the well-established practice of multiple harmonic analyses [3,[33][34][35]. In fact, the approximate equation for determining the optimal resistance [36,37] provides this value for a single set of working conditions, i.e., a single working point.…”

Section: Geometry Optimization and Influence On The Peh Responsementioning

confidence: 99%

Experimental Characterization of Optimized Piezoelectric Energy Harvesters for Wearable Sensor Networks

Gljušćić

Zelenika

2021

Sensors

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The development of wearable devices and remote sensor networks progressively relies on their increased power autonomy, which can be further expanded by replacing conventional power sources, characterized by limited lifetimes, with energy harvesting systems. Due to its pervasiveness, kinetic energy is considered as one of the most promising energy forms, especially when combined with the simple and scalable piezoelectric approach. The integration of piezoelectric energy harvesters, generally in the form of bimorph cantilevers, with wearable and remote sensors, highlighted a drawback of such a configuration, i.e., their narrow operating bandwidth. In order to overcome this disadvantage while maximizing power outputs, optimized cantilever geometries, developed using the design of experiments approach, are analysed and combined in this work with frequency up-conversion excitation that allows converting random kinetic ambient motion into a periodical excitation of the harvester. The developed optimised designs, all with the same harvesters’ footprint area of 23 × 15 mm, are thoroughly analysed via coupled harmonic and transient numerical analyses, along with the mostly neglected strength analyses. The models are validated experimentally via innovative experimental setups. The thus-proposed f = 50 mm watch-like prototype allows, by using a rotating flywheel, the collection of low-frequency (ca. 1 to 3 Hz) human kinetic energy, and the periodic excitation of the optimized harvesters that, oscillating at their eigenfrequencies (~325 to ~930 Hz), display specific power outputs improved by up to 5.5 times, when compared to a conventional rectangular form, with maximal power outputs of up to >130 mW and average power outputs of up to >3 mW. These power levels should amply satisfy the requirements of factual wearable medical systems, while providing also an adaptability to accommodate several diverse sensors. All of this creates the preconditions for the development of novel autonomous wearable devices aimed not only at sensor networks for remote patient monitoring and telemedicine, but, potentially, also for IoT and structural health monitoring.

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Section: Geometry Optimization and Influence On The Peh Responsementioning

confidence: 99%

Experimental Characterization of Optimized Piezoelectric Energy Harvesters for Wearable Sensor Networks

Gljušćić

Zelenika

2021

Sensors

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Perovskite Relaxor‐Dependent Contributions to Piezoelectric Power Generation of Multiple PZT Tape‐Based Cantilever Structures at Nonresonant Frequency

Kim

Park

Key

et al. 2023

Advanced Energy Materials

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Piezoelectric energy harvesters based on Pb(Zr0.5Ti0.5)O3 (PZT) ceramics have been extensively studied for various low‐power applications. Herein, unprecedented multiple‐harvester structures with record‐breaking performance are proposed for targeting nonresonant‐frequency or extremely low‐frequency applications. Exceptional combinations of PZT with three different relaxor materials, namely, Pb(Co1/3Nb2/3)O3 (PCN), Pb(Ni1/3Nb2/3)O3 (PNN), and Pb(Zn1/3Nb2/3)O3 (PZN), are systematically investigated in terms of their structural changes and piezoelectricity. Following the optimization of the PCN–PZT, PNN–PZT, and PZN–PZT systems in terms of piezoelectricity and power generation, a few device structures are designed using the advantages of each system. For example, the highest g31 composition of 0.2PCN–0.8PZT is combined with the highest d31 of 0.4PZN–0.6PZT to maximize the power generation in the two‐parallel‐tape structure. Multilayer harvester structures with up to four layers are also evaluated to correlate the enhanced voltage and current with the layer thickness and effective area for surface‐charge polarization. The four‐layer 0.4PZN‐0.6PZT unimorph cantilever demonstrates exceptional energy‐harvesting performance of ≈535.9 µW, corresponding to the record power density of ≈10 mW cm−2 g−2 Hz−1 at 2 Hz. The outstanding outcome is believed to be a benchmark for various nonresonant‐frequency applications.

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Origin of enhanced piezoelectric energy harvesting in all-polymer-based core–shell nanofibers with controlled shell-thickness

Han

Kim

Choi

et al. 2021

Composites Part B: Engineering

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Internal-field-dependent low-frequency piezoelectric energy harvesting characteristics of in situ processed Nb-doped Pb(Zr,Ti)O3 thin-film cantilevers

Cited by 5 publications

References 30 publications

Experimental Characterization of Optimized Piezoelectric Energy Harvesters for Wearable Sensor Networks

Experimental Characterization of Optimized Piezoelectric Energy Harvesters for Wearable Sensor Networks

Perovskite Relaxor‐Dependent Contributions to Piezoelectric Power Generation of Multiple PZT Tape‐Based Cantilever Structures at Nonresonant Frequency

Origin of enhanced piezoelectric energy harvesting in all-polymer-based core–shell nanofibers with controlled shell-thickness

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