• Title/Summary/Keyword: 압전 에너지 하베스팅

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Flexible Energy Harvesting Device based on Hybrid Piezoelectric Nanocomposite made of Lead-Free BCTZ Ceramic and Piezo-polymer (비납계 BCTZ 압전세라믹과 압전폴리머로 제작된 하이브리드 나노복합체 기반의 플렉서블 에너지 하베스팅 소자)

  • Park, Sung Cheol;Lee, Jae Hoon;Kim, Yeon-gyu;Park, Kwi-Il
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.35 no.1
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    • pp.72-79
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    • 2022
  • Piezoelectric energy harvesting technologies, which can be used to convert the electricity from the mechanical energy, have been developed in order to assist or power the wearable electronics. To realize non-toxic and biocompatible electronics, the lead-free (Ba0.85Ca0.15)(Ti0.90Zr0.10)O3 (BCTZ) nanoparticles (NPs) are being studied with a great attention as flexible energy harvesting device. Herein, piezoelectric hybrid nanocomposites were fabricated using BCTZ NPs-embedded poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] matrix to improve the performance of flexible energy harvester. Output performance of the fabricated energy device was investigated by the well-optimized measurement system during the periodically bending and releasing motions. The generated open-circuit voltage and the short-circuit current of the piezoelectric hybrid nanocomposite-based energy harvester reached up to ~15 V and ~1.1 ㎂, respectively; moreover, the instantaneous power of 3.5 ㎼ is determined from load voltage and current at the external load of 20 MΩ. This research is expected to cultivate a new approach to high-performance wearable self-powering electronics.

Piezoelectric Energy Harvesting Characteristics of Trapezoidal PZT/Ag Laminate Cantilever Generator (사다리꼴 PZT/Ag Laminate 외팔보 발전기의 압전 에너지 하베스팅 특성)

  • Na, Yong-Hyeon;Lee, Min-Seon;Yun, Ji-Sun;Hong, Youn-Woo;Paik, Jong-Hoo;Cho, Jeong-Ho;Lee, Jung Woo;Jeong, Young-Hun
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.31 no.7
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    • pp.462-468
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    • 2018
  • The piezoelectric energy harvesting characteristics of a trapezoidal cantilever generator with lead zirconate titanate (PZT) laminate were investigated with various Ag inner electrodes. The piezoelectric mode of operation was a transverse mode by using a planar electrode pattern. The piezoelectric cantilever generator was fabricated using trapezoidal cofired-PZT/Ag laminates by five specimens of 2, 3, 4, 7, and 13 layers of Ag. As the number of Ag electrodes increased, impedance and output voltage at resonant frequency significantly decreased, and capacitance and output current showed an increasing tendency. A maximum output power density of $7.60mW/cm^3$ was realized for the specimen with seven Ag layers in the optimal condition of acceleration (1.2 g) and resistive load ($600{\Omega}$), which corresponds to a normalized power factor of $5.28mW/g^2{\cdot}cm^3$.

Energy Harvesting Characteristics of Spring Supported Piezoelectric Cantilever Structure (SPCS) (압전 캔틸레버 스프링 구조물(SPCS)의 에너지 하베스팅 특성)

  • Kim, Kyoung-Bum;Kim, Chang-Il;Jeong, Young-Hun;Lee, Young-Jin;Cho, Jeong-Ho;Paik, Jong-Hoo;Nahm, Sahn;Seong, Tae-Hyeon
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.25 no.10
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    • pp.766-772
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    • 2012
  • Spring supported piezoelectric cantilever structures (SPCS) were fabricated for vibration-based energy harvester application. We selected four elastic springs (A, B, C, and D type) as cantilever's supporter, each elastic spring has a different spring constant (S). The C type of SPCS ($S_C$: 4,649 N/m) showed a extremely low resonance frequency of 81 Hz along with the highest power output of 38.5 mW while the A type of SPCS ($S_A$: 40,629 N/m) didn't show a resonance frequency while. Therefore, it is considered that the lower spring constant lead to a lower resonance frequency of the SPCS. In addition, a tip mass (18 g) at one end of the SPCS could further reduce the resonance frequency without heavy degradation of power output.

Piezoelectric Energy Harvesting Characteristics of Hard PZT Interdigitated Electrode (IDE) Unimorph Cantilever (Hard PZT IDE 유니몰프 캔틸레버의 압전 에너지 하베스팅 특성)

  • Lee, Min-seon;Kim, Chang-il;Yun, Ji-sun;Park, Woon-ik;Hong, Youn-woo;Cho, Jeong-ho;Paik, Jong-hoo;Park, Yong-ho;Jang, Yong-ho;Choi, Beom-jin;Jeong, Young-hun
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.30 no.8
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    • pp.501-507
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    • 2017
  • A unimorph piezoelectric cantilever generator with an interdigitated electrode (IDE) was developed for vibration energy harvester applications driven in the longitudinal mode. Hard lead zirconate titanate (PZT) ceramic with a high $Q_m$ of 1,280 was used as the piezoelectric active material. Ten PZT sheets produced by tape casting were laminated and co-fired with an Ag/Pd IDE at $1,050^{\circ}C$ for 2 h. The approximately $280{\mu}m$-thick co-fired PZT laminate with the IDE was attached to a stainless steel substrate with an adhesive epoxy for the fabrication of an IDE unimorph cantilever. Its energy harvesting characteristics were evaluated: an output power of $1.1{\mu}W$ at 120 Hz across the resistive load of $700k{\Omega}$ was obtained, corresponding to a normalized power factor of $4.1{\mu}W/(G^2{\cdot}cm^3)$.

Flexible Energy Harvesting Device Based on Porous Piezoelectric Sponge (다공성 압전 스펀지를 이용한 플렉서블 에너지 하베스팅 소자 개발)

  • Dong Hun, Heo;Dong Yeol, Hyeon;Sung Cheol, Park;Kwi-Il, Park
    • Korean Journal of Materials Research
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    • v.32 no.11
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    • pp.508-514
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    • 2022
  • Piezoelectric composite films which are enabled by inorganic piezoelectric nanomaterials-embedded polymer, have attracted enormous attention as a sustainable power source for low powered electronics, because of their ease of fabrication and flexible nature. However, the absorption of applied stress by the soft polymeric matrices is a major issue that must be solved to expand the fields of piezoelectric composite applications. Herein, a flexible and porous piezoelectric composite (piezoelectric sponge) comprised of BaTiO3 nanoparticles and polydimethylsiloxane was developed using template method to enhance the energy conversion efficiency by minimizing the stress that vanishes into the polymer matrix. In the porous structure, effective stress transfer can occur between the piezoelectric active materials in compression mode due to direct contact between the ceramic particles embedded in the pore-polymer interface. The piezoelectric sponge with 30 wt% of BaTiO3 particles generated an open-circuit voltage of ~12 V and a short-circuit current of ~150 nA. A finite element method-based simulation was conducted to theoretically back up that the piezoelectric output performance was effectively improved by introducing the sponge structure. Furthermore, to demonstrate the feasibility of pressure detecting applications using the BaTiO3 particles-embedded piezoelectric sponge, the composite was arranged in a 3 × 3 array and integrated into a single pressure sensor. The fabricated sensor array successfully detected the shape of the applied pressure. This work can provide a cost-effective, biocompatible, and structural strategy for realizing piezoelectric composite-based energy harvesters and self-powered sensors with improved energy conversion efficiency.

Study on the Piezoelectric Energy Harvesting Technology for the Energy Conversion of Vibration in Automobiles (자동차 진동 에너지 변환을 위한 압전 에너지 하베스팅에 관한 연구)

  • Lee, Hyeon Yeong;Kim, Kwangwon;Ye, Jiwon;Woo, Suhyeon;Lee, Geon;Lee, Seungah;Jeong, Seong Rok;Jeong, Seon Hye;Kim, Ho Seong;Nam, Ga Hyeon;Jo, Yun Yeong;Choi, Han Seung;Ryu, Jungho
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.34 no.6
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    • pp.495-504
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    • 2021
  • Energy Harvesting is a technology that can convert wasted energy such as vibration, heat, light, electromagnetic energy, etc. into usable electrical energy. Among them, vibration-based piezoelectric energy harvesting (PEH) has high energy conversion efficiency with a small volume; thus, it is expected to be used in various autonomous powering devices, such as implantable medical devices, wearable devices, and energy harvesting from road or automobiles. In this study, wasted vibration energy in an automobile is converted into electrical energy by high-power piezoelectric materials, and the generated electrical energy is found to be an auxiliary power source for the operation of wireless sensor nodes, LEDs, etc. inside an automobile. In order to properly install the PEH in an automobile, vibration characteristics includes frequency and amplitude at several positions in the automobile is monitored initially and the cantilever structured PEH was designed accordingly. The harvesting properties of fabricated PEH is characterized and installed into the engine part of the automobile, where the vibration amplitude is stable and strong. The feasibility of PEH is confirmed by operating electric components (LEDs) that can be used in practice.