Polar-axis-deformation induced molecular pyroelectrics for waste heat harvesting
| Project/Area Number |
22K14655
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 32020:Functional solid state chemistry-related
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| Research Institution | Hokkaido University |
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Principal Investigator |
黄 瑞康 北海道大学, 電子科学研究所, 助教 (60901296)
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| Project Period (FY) |
2022-04-01 – 2024-03-31
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| Project Status |
Completed (Fiscal Year 2023)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2023: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2022: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
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| Keywords | supramolecule / polarity / structural flexibility / pyroelectricity / Molecular pyroelectrics / Waste heat harvesting / Thermal expansion / Supramolecular crystals |
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| Outline of Research at the Start |
Waste heat recycling has been a huge challenge. One of the most promising solution is recycling them by pyroelectric materials that can generate current during temperature change. This research aims to demonstrate a novel strategy (polar axis deformation) for designing molecular pyroelectrics, and explore their applications for waste heat harvesting. In this research, the design-structure-pyroelectricity relationship will be discussed and prototype of energy harvesting will be made. Results may open up a new area of molecular pyroelectrics design and their application in energy problems.
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| Outline of Annual Research Achievements |
18-crown-6-based supramolecular crystals can exhibit structural flexibility or polarity. For example, nitromethane solvate 18C6 is highly structurally flexible due to Van der Waal interactions between nitromethane and 18C6. Additionally, (4-methoxyanilinium)(18C6)(BF4) shows polarity due to the polar -OCH3 group, allowing the crystal to exhibit piezoelectricity, pyroelectricity, and ferroelectricity. Combining polarity and structural flexibility in an 18C6 crystal is achievable using polar ammoniums with an increased number of -CH2 groups.
Our preliminary study found that that the combination of 3-hydroxyl-adamantane-1-aminium (HADA-OH) with 18C6 produced a crystal that was both structurally flexible and polar due to the -OH group. The polar (HADA-OH)(18C6)ClO4 crystal was found to exhibit both the highest structural flexibility among organic salts and large pyroelectricity (20 times that of PVDF).
This study focuses on HADA-R derivatives (R = H, F, Cl, Br) and examines the effects of different -R groups and counter anions on crystal packing, flexibility, and pyroelectricity. The goal is to establish a relationship between design, structure, and performance in this system and propose a novel strategy for high-performance pyroelectrics for waste heat harvesting.
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Report
(2 results)
Research Products
(11 results)
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[Journal Article] Multifunctional Triggering by Solid-Phase Molecular Motion: Relaxor Ferroelectricity, Modulation of Magnetic Exchange Interactions, and Enhancement of Negative Thermal Expansion2023
Author(s)
Li, Simin; Takahashi, Kiyonori; Huang, Rui-Kang; Xue, Chen; Kokado, Kenta; Hoshino, Norihisa; Akutagawa, Tomoyuki; Nishihara, Sadafumi; Nakamura, Takayoshi
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Journal Title
Chemistry of Materials
Volume: 35
Issue: 6
Pages: 2421-2428
DOI
Related Report
Peer Reviewed
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