Enhancing efficiency of low-grade heat harvesting by structural vibration entropy in thermally regenerative electrochemical cycles

The majority of waste-heat energy exists in the form of low-grade heat (<100 °C), which is immensely difficult to convert into usable energy using conventional energy-harvesting systems. Thermally regenerative electrochemical cycles (TREC), which integrate battery and thermal-energy-harvesting fu...

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Main Authors: Choi, Ahreum, Song, You-Yeob, Kim, Juyoung, Kim, Donghyeon, Kim, Min-Ho, Lee, Seok Woo, Seo, Dong-Hwa, Lee, Hyun-Wook
Other Authors: School of Electrical and Electronic Engineering
Format: Article
Language:English
Published: 2023
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Online Access:https://hdl.handle.net/10356/170980
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1709802023-11-24T07:23:40Z Enhancing efficiency of low-grade heat harvesting by structural vibration entropy in thermally regenerative electrochemical cycles Choi, Ahreum Song, You-Yeob Kim, Juyoung Kim, Donghyeon Kim, Min-Ho Lee, Seok Woo Seo, Dong-Hwa Lee, Hyun-Wook School of Electrical and Electronic Engineering Engineering::Materials::Energy materials Prussian Blue Analogs Structural Vibration The majority of waste-heat energy exists in the form of low-grade heat (<100 °C), which is immensely difficult to convert into usable energy using conventional energy-harvesting systems. Thermally regenerative electrochemical cycles (TREC), which integrate battery and thermal-energy-harvesting functionalities, are considered an attractive system for low-grade heat harvesting. Herein, the role of structural vibration modes in enhancing the efficacy of TREC systems is investigated. How changes in bonding covalency, influenced by the number of structural water molecules, impact the vibration modes is analyzed. It is discovered that even small amounts of water molecules can induce the A1g stretching mode of cyanide ligands with strong structural vibration energy, which significantly contributes to a larger temperature coefficient (ɑ) in a TREC system. Leveraging these insights, a highly efficient TREC system using a sodium-ion-based aqueous electrolyte is designed and implemented. This study provides valuable insights into the potential of TREC systems, offering a deeper understanding of the intrinsic properties of Prussian Blue analogs regulated by structural vibration modes. These insights open up new possibilities for enhancing the energy-harvesting capabilities of TREC systems. National Research Foundation (NRF) Published version This work was supported by the 2023 Research Fund (1.230040.01) of UNIST, Individual Basic Science & Engineering Research Program (RS‐2023‐00208929, 2023R1A2C2008242), and the National Center for Materials Research Data (2021M3A7C2089743) through the National Research Foundation (NRF) of Korea funded by the Ministry of Science and ICT (MSIT). The computational work was supported by the Supercomputing Center/Korea Institute of Science and Technology Information with supercomputing resources including technical support (KSC‐2022‐CRE‐0343 to H.‐W.L.). S.W.L. acknowledges the support by the NRF, Prime Minister's Office, Singapore under its NRF‐ANR Joint Programme (grant number Award No. NRF2019‐NRF‐ANR052 KineHarvest). 2023-10-10T01:18:19Z 2023-10-10T01:18:19Z 2023 Journal Article Choi, A., Song, Y., Kim, J., Kim, D., Kim, M., Lee, S. W., Seo, D. & Lee, H. (2023). Enhancing efficiency of low-grade heat harvesting by structural vibration entropy in thermally regenerative electrochemical cycles. Advanced Materials, 35(38), e2303199-. https://dx.doi.org/10.1002/adma.202303199 0935-9648 https://hdl.handle.net/10356/170980 10.1002/adma.202303199 37395728 2-s2.0-85165654505 38 35 e2303199 en NRF2019-NRF-ANR052 KineHarvest Advanced Materials © 2023 The Authors. Advanced Materials published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Materials::Energy materials
Prussian Blue Analogs
Structural Vibration
spellingShingle Engineering::Materials::Energy materials
Prussian Blue Analogs
Structural Vibration
Choi, Ahreum
Song, You-Yeob
Kim, Juyoung
Kim, Donghyeon
Kim, Min-Ho
Lee, Seok Woo
Seo, Dong-Hwa
Lee, Hyun-Wook
Enhancing efficiency of low-grade heat harvesting by structural vibration entropy in thermally regenerative electrochemical cycles
description The majority of waste-heat energy exists in the form of low-grade heat (<100 °C), which is immensely difficult to convert into usable energy using conventional energy-harvesting systems. Thermally regenerative electrochemical cycles (TREC), which integrate battery and thermal-energy-harvesting functionalities, are considered an attractive system for low-grade heat harvesting. Herein, the role of structural vibration modes in enhancing the efficacy of TREC systems is investigated. How changes in bonding covalency, influenced by the number of structural water molecules, impact the vibration modes is analyzed. It is discovered that even small amounts of water molecules can induce the A1g stretching mode of cyanide ligands with strong structural vibration energy, which significantly contributes to a larger temperature coefficient (ɑ) in a TREC system. Leveraging these insights, a highly efficient TREC system using a sodium-ion-based aqueous electrolyte is designed and implemented. This study provides valuable insights into the potential of TREC systems, offering a deeper understanding of the intrinsic properties of Prussian Blue analogs regulated by structural vibration modes. These insights open up new possibilities for enhancing the energy-harvesting capabilities of TREC systems.
author2 School of Electrical and Electronic Engineering
author_facet School of Electrical and Electronic Engineering
Choi, Ahreum
Song, You-Yeob
Kim, Juyoung
Kim, Donghyeon
Kim, Min-Ho
Lee, Seok Woo
Seo, Dong-Hwa
Lee, Hyun-Wook
format Article
author Choi, Ahreum
Song, You-Yeob
Kim, Juyoung
Kim, Donghyeon
Kim, Min-Ho
Lee, Seok Woo
Seo, Dong-Hwa
Lee, Hyun-Wook
author_sort Choi, Ahreum
title Enhancing efficiency of low-grade heat harvesting by structural vibration entropy in thermally regenerative electrochemical cycles
title_short Enhancing efficiency of low-grade heat harvesting by structural vibration entropy in thermally regenerative electrochemical cycles
title_full Enhancing efficiency of low-grade heat harvesting by structural vibration entropy in thermally regenerative electrochemical cycles
title_fullStr Enhancing efficiency of low-grade heat harvesting by structural vibration entropy in thermally regenerative electrochemical cycles
title_full_unstemmed Enhancing efficiency of low-grade heat harvesting by structural vibration entropy in thermally regenerative electrochemical cycles
title_sort enhancing efficiency of low-grade heat harvesting by structural vibration entropy in thermally regenerative electrochemical cycles
publishDate 2023
url https://hdl.handle.net/10356/170980
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