Journal of Powder Materials

Research Article

Development of Composite-film-based Flexible Energy Harvester using Lead-free BCTZ Piezoelectric Nanomaterials: Gwang Hyeon Kim, Hyeon Jun Park, Bitna Bae, Haksu Jang, Cheol Min Kim, Donghun Lee, Kwi-Il Park; J Powder Mater. 2024;31(1):16-22. Published online February 28, 2024; DOI: https://doi.org/10.4150/KPMI.2024.31.1.16

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Composite-based piezoelectric devices are extensively studied to develop sustainable power supply and selfpowered devices owing to their excellent mechanical durability and output performance. In this study, we design a leadfree piezoelectric nanocomposite utilizing (Ba_0.85Ca_0.15)(Ti_0.9Zr_0.1)O₃ (BCTZ) nanomaterials for realizing highly flexible energy harvesters. To improve the output performance of the devices, we incorporate porous BCTZ nanowires (NWs) into the nanoparticle (NP)-based piezoelectric nanocomposite. BCTZ NPs and NWs are synthesized through the solidstate reaction and sol-gel-based electrospinning, respectively; subsequently, they are dispersed inside a polyimide matrix. The output performance of the energy harvesters is measured using an optimized measurement system during repetitive mechanical deformation by varying the composition of the NPs and NWs. A nanocomposite-based energy harvester with 4:1 weight ratio generates the maximum open-circuit voltage and short-circuit current of 0.83 V and 0.28 A, respectively. In this study, self-powered devices are constructed with enhanced output performance by using piezoelectric energy harvesting for application in flexible and wearable devices.

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Flexible Thermoelectric Energy Harvester with Stacked Structure of Thermoelectric Composite Films Made of PVDF and Bi2Te3-Based Particles
Da Eun Shin, Nagamalleswara Rao Alluri, Kwi-Il Park
ACS Applied Energy Materials.2024; 7(19): 8288. CrossRef
Enhanced energy harvesting of fibrous composite membranes via plasma-piezopolymer interaction
Hyeon Jun Park, Bitna Bae, HakSu Jang, Dong Yeol Hyeon, Dong Hun Lee, Gwang Hyun Kim, Cheol Min Kim, Nagamalleswara Rao Alluri, Changyeon Baek, Min-Ku Lee, Gyoung-Ja Lee, Kwi-Il Park
Nano Energy.2024; 131: 110299. CrossRef
CoFe2O4-BaTiO3 core-shell-embedded flexible polymer composite as an efficient magnetoelectric energy harvester
Bitna Bae, Nagamalleswara Rao Alluri, Cheol Min Kim, Jungho Ryu, Gwang Hyeon Kim, Hyeon Jun Park, Changyeon Baek, Min-Ku Lee, Gyoung-Ja Lee, Geon-Tae Hwang, Kwi-Il Park
Materials Today Physics.2024; 48: 101567. CrossRef

Articles

Mechanical Properties of Bulk Graphite using Artificial Graphite Scrap as a Function of Particle Size: Sang Hye Lee, Sang Min Lee, Won Pyo Jang, Jae Seung Roh; J Korean Powder Metall Inst. 2021;28(1):13-19. Published online February 1, 2021; DOI: https://doi.org/10.4150/KPMI.2021.28.1.13

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Bulk graphite is manufactured using graphite scrap as the filler and phenolic resin as the binder. Graphite scrap, which is the by-product of processing the final graphite product, is pulverized and sieved by particle size. The relationship between the density and porosity is analyzed by measuring the mechanical properties of bulk graphite. The filler materials are sieved into mean particle sizes of 10.62, 23.38, 54.09, 84.29, and 126.64 μm. The bulk graphite density using the filler powder with a particle size of 54.09 μm is 1.38 g/cm³, which is the highest value in this study. The compressive strength tends to increase as the bulk graphite density increases. The highest compressive strength of 43.14 MPa is achieved with the 54.09 μm powder. The highest flexural strength of 23.08 MPa is achieved using the 10.62 μm powder, having the smallest average particle size. The compressive strength is affected by the density of bulk graphite, and the flexural strength is affected by the filler particle size of bulk graphite.

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Effect of Microstructural Change under Pressure during Isostatic Pressing on Mechanical and Electrical Properties of Isotropic Carbon Blocks
Tae-Sub Byun, Sang-Hye Lee, Suk-Hwan Kim, Jae-Seung Roh
Materials.2024; 17(2): 387. CrossRef
Feasibility assessment of manufacturing carbonized blocks from rice husk charcoal
Young-Min Hwang, Jae-Seung Roh, Gibeop Nam
Biomass Conversion and Biorefinery.2024; 14(20): 26409. CrossRef
Improving the packing and mechanical properties of graphite blocks by controlling filler particle-size distribution
Hye in Hwang, Ji Hong Kim, Ji Sun Im
Advanced Composite Materials.2024; 33(5): 762. CrossRef
Effect of Impregnation and Graphitization on EDM Performance of Graphite Blocks Using Recycled Graphite Scrap
Sang-Hye Lee, Dong-Pyo Jeon, Hyun-Yong Lee, Dong-Gu Lee, Jae-Seung Roh
Processes.2023; 11(12): 3368. CrossRef
Ultrafine Graphite Scrap and Carbon Blocks Prepared by High-Solid-Loading Bead Milling and Conventional Ball Milling: A Comparative Assessment
Chonradee Amnatsin, Waroot Kanlayakan, Siraprapa Lhosupasirirat, Nattarut Verojpipath, Boonsueb Pragobjinda, Tanakorn Osotchan, Chakrit Sirisinha, Toemsak Srikhirin
ACS Omega.2023; 8(50): 47919. CrossRef
The Effect of the Heating Rate during Carbonization on the Porosity, Strength, and Electrical Resistivity of Graphite Blocks Using Phenolic Resin as a Binder
Sang-Hye Lee, Jae-Hyun Kim, Woo-Seok Kim, Jae-Seung Roh
Materials.2022; 15(9): 3259. CrossRef
Rheological Behaviour of Hard-Metal Carbide Powder Suspensions at High Shear Rates
B. Hausnerová, P. Sáha, J. Kubát, T. Kitano, J. Becker
Journal of Polymer Engineering.2000;[Epub] CrossRef

Flexible Cu-In-Se Quantum Dot-Sensitized Solar Cells Based on Nanotube Electrodes: Jae-Yup Kim; J Korean Powder Metall Inst. 2019;26(1):45-48. Published online February 1, 2019; DOI: https://doi.org/10.4150/KPMI.2019.26.1.45

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Abstract PDF: Quantum dots (QDs) are an attractive material for application in solar energy conversion devices because of their unique properties including facile band-gap tuning, a high-absorption coefficient, low-cost processing, and the potential multiple exciton generation effect. Recently, highly efficient quantum dot-sensitized solar cells (QDSCs) have been developed based on CdSe, PbS, CdS, and Cu-In-Se QDs. However, for the commercialization and wide application of these QDSCs, replacing the conventional rigid glass substrates with flexible substrates is required. Here, we demonstrate flexible CISe QDSCs based on vertically aligned TiO₂ nanotube (NT) electrodes. The highly uniform TiO₂ NT electrodes are prepared by two-step anodic oxidation. Using these flexible photoanodes and semi-transparent Pt counter electrodes, we fabricate the QDSCs and examine their photovoltaic properties. In particular, photovoltaic performances are optimized by controlling the nanostructure of TiO₂ NT electrodes.

Recent Progress in Flexible Energy Harvesting Devices based on Piezoelectric Nanomaterials: Kwi-Il Park; J Korean Powder Metall Inst. 2018;25(3):263-272. Published online June 1, 2018; DOI: https://doi.org/10.4150/KPMI.2018.25.3.263

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5 Citations

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Recent developments in the field of energy harvesting technology that convert ambient energy resources into electricity enable the use of self-powered energy systems in wearable and portable electronic devices without the need for additional external power sources. In particular, piezoelectric-effect-based flexible energy harvesters have drawn much attention because they can guarantee power generation from ubiquitous mechanical and vibrational movements. In response to demand for sustainable, permanent, and remote use of real-life personal electronics, many research groups have investigated flexible piezoelectric energy harvesters (f-PEHs) that employ nanoscaled piezoelectric materials such as nanowires, nanoparticles, nanofibers, and nanotubes. In those attempts, they have proven the feasibility of energy harvesting from tiny periodic mechanical deformations and energy utilization of f-PEH in commercial electronic devices. This review paper provides a brief overview of f-PEH devices based on piezoelectric nanomaterials and summarizes the development history, output performance, and applications.

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Development and Characterization of Hafnium-Doped BaTiO3 Nanoparticle-Based Flexible Piezoelectric Devices
HakSu Jang, Hyeon Jun Park, Gwang Hyeon Kim, Gyoung-Ja Lee, Jae-Hoon Ji, Donghun Lee, Young Hwa Jung, Min-Ku Lee, Changyeon Baek, Kwi-Il Park
JOURNAL OF SENSOR SCIENCE AND TECHNOLOGY.2024; 33(1): 34. CrossRef
Enhanced Piezoelectric Performance of Composite Fibers Based on Lead-Free BCTZ Ceramics and P(VDF-TrFE) Piezopolymer for Self-Powered Wearable Sensors
Sung Cheol Park, Chaeyoung Nam, Changyeon Baek, Min-Ku Lee, Gyoung-Ja Lee, Kwi-Il Park
ACS Sustainable Chemistry & Engineering.2022; 10(43): 14370. CrossRef
A Comparison Study of Output Performance of Organic-Inorganic Piezoelectric Nanocomposite Made of Piezoelectric/Non-piezoelectric Polymers and BaTiO₃ Nanoparticles
Dong Yeol Hyeon, Kwi-Il Park
Journal of Korean Powder Metallurgy Institute.2019; 26(2): 119. CrossRef
Piezoelectric Flexible Energy Harvester Based on BaTiO3 Thin Film Enabled by Exfoliating the Mica Substrate
Dong Yeol Hyeon, Kwi-Il Park
Energy Technology.2019;[Epub] CrossRef
Piezoelectric Energy Harvesting from Two-Dimensional Boron Nitride Nanoflakes
Gyoung-Ja Lee, Min-Ku Lee, Jin-Ju Park, Dong Yeol Hyeon, Chang Kyu Jeong, Kwi-Il Park
ACS Applied Materials & Interfaces.2019; 11(41): 37920. CrossRef

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