Journal of Powder Materials

Cheol Min Kim

4 Articles

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 hybrid thermoelectric films made of bismuth telluride-PEDOT:PSS composites enabled by freezing-thawing process and simple chemical treatment
Cheol Min Kim, Seoha Kim, Nagamalleswara Rao Alluri, Bitna Bae, Momanyi Amos Okirigiti, Gwang Hyun Kim, Hyeon Jun Park, Haksu Jang, Changyeon Baek, Min-Ku Lee, Gyoung-Ja Lee, Kwi-Il Park
Materials Today Chemistry.2025; 44: 102532. CrossRef
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
Long‐Lasting, Steady and Enhanced Energy Harvesting by Inserting a Conductive Layer into the Piezoelectric Polymer
HakSu Jang, Gwang Hyeon Kim, Dong Won Jeon, Hyeon Jun Park, BitNa Bae, Nagamalleswara Rao Alluri, Cheol Min Kim, Changyeon Baek, Min‐Ku Lee, Sung Beom Cho, Gyoung‐Ja Lee, Kwi‐Il Park
Advanced Functional Materials.2024;[Epub] CrossRef

Fabrication of Flexible Energy Harvester Based on BaTiO₃ Piezoelectric Nanotube Arrays: Seo Young Yoon, Cheol Min Kim, Bitna Bae, Yujin Na, Haksu Jang, Kwi-Il Park; J Powder Mater. 2023;30(6):521-527. Published online December 1, 2023; DOI: https://doi.org/10.4150/KPMI.2023.30.6.521

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Piezoelectric technology, which converts mechanical energy into electrical energy, has recently attracted drawn considerable attention in the industry. Among the many kinds of piezoelectric materials, BaTiO₃ nanotube arrays, which have outstanding uniformity and anisotropic orientation compared to nanowire-based arrays, can be fabricated using a simple synthesis process. In this study, we developed a flexible piezoelectric energy harvester (f-PEH) based on a composite film with PVDF-coated BaTiO₃ nanotube arrays through sequential anodization and hydrothermal synthesis processes. The f-PEH fabricated using the piezoelectric composite film exhibited excellent piezoelectric performance and high flexibility compared to the previously reported BaTiO₃ nanotube array-based energy harvester. These results demonstrate the possibility for widely application with high performance by our advanced f-PEH technique based on BaTiO₃ nanotube arrays.

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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
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

Recent Advances in Thermoelectric Materials and Devices: Improving Power Generation Performance: Momanyi Amos Okirigiti, Cheol Min Kim, Hyejeong Choi, Nagamalleswara Rao Alluri, Kwi-Il Park; Received November 15, 2024 Accepted December 6, 2024 Published online December 16, 2024; DOI: https://doi.org/10.4150/jpm.2024.00395

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Abstract: Thermoelectric materials have been the focus of extensive research interest in recent years due to their potential in clean power generation from waste heat. Their conversion efficiency is primarily reflected by the dimensionless figure of merit, with higher values indicating better performance. There is a pressing need to discover materials that increase output power and improve performance, from the material level to device fabrication. This review provides a comprehensive analysis of recent advancements, such as Bi2Te3-based nanostructures that reduce thermal conductivity while maintaining electrical conductivity, GeTe-based high entropy alloys that utilize multiple elements for improved thermoelectric properties, porous metal-organic frameworks offering tunable structures, and organic/hybrid films that present low-cost, flexible solutions. Innovations in thermoelectric generator designs, such as asymmetrical geometries, segmented modules, and flexible devices, have further contributed to increased efficiency and output power. Together, these developments are paving the way for more effective thermoelectric technologies in sustainable energy generation.

Flexible Hybrid Energy Harvester based on Thermoelectric Composite Film and Electrospun Piezopolymer Membranes: Hyomin Jeon, Cheol Min Kim, Hyeon Jun Park, Bitna Bae, Hyejeong Choi, HakSu Jang, Kwi-Il Park; Received November 29, 2024 Accepted December 30, 2024 Published online February 12, 2025; DOI: https://doi.org/10.4150/jpm.2024.00458

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Abstract: A hybrid energy harvester that consisted of thermoelectric (TE) composite film and electrospun piezoelectric (PE) polymeric membranes was constructed. TE composites were fabricated by dispersing inorganic TE powders inside polyvinylidene fluoride elastomer using a drop-casting technique. The polyvinylidene fluoride-trifluoroethylene, which was chosen due to its excellent chemical resistance, mechanical stability, and biocompatibility, was electrospun onto an aluminum foil to fabricate the ultra-flexible PE membranes. To create a hybrid energy harvester that can simultaneously convert heat and mechanical energy resources into electricity, the TE composite films attached to the PE membrane were encapsulated with protective polydimethylsiloxane. The fabricated energy harvester converted the outputs with a maximum voltage of 4 V (PE performance) and current signals of 0.2 μA (TE performance) under periodical heat input and mechanical bending in hybrid modes. This study demonstrates the potential of the hybrid energy harvester for powering flexible and wearable electronics, offering a sustainable and reliable power source.

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