Efficient low-grade heat harvesting enabled by tuning the hydration entropy in an electrochemical system
Harvesting of low-grade heat (<100 °C) is promising, but its application is hampered by a lack of efficient and low-cost systems. The thermally regenerative electrochemical cycle (TREC) is a potential alternative system with high energy-conversion efficiency. Here, the temperature coefficient (α)...
| Main Authors: | , , , , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2022
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/160725 |
| _version_ | 1811696566771122176 |
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| author | Gao, Caitian Liu, Yezhou Chen, Bingbing Yun, Jeonghun Feng, Erxi Kim, Yeongae Kim, Moobum Choi, Ahreum Lee, Hyun-Wook Lee, Seok Woo |
| author2 | School of Electrical and Electronic Engineering |
| author_facet | School of Electrical and Electronic Engineering Gao, Caitian Liu, Yezhou Chen, Bingbing Yun, Jeonghun Feng, Erxi Kim, Yeongae Kim, Moobum Choi, Ahreum Lee, Hyun-Wook Lee, Seok Woo |
| author_sort | Gao, Caitian |
| collection | NTU |
| description | Harvesting of low-grade heat (<100 °C) is promising, but its application is hampered by a lack of efficient and low-cost systems. The thermally regenerative electrochemical cycle (TREC) is a potential alternative system with high energy-conversion efficiency. Here, the temperature coefficient (α), which is a key factor in a TREC, is studied by tuning the hydration entropy of the electrochemical reaction. The change of α in copper hexacyanoferrate (CuHCFe) with intercalation of different monovalent cations (Na+ , K+ , Rb+ , and Cs+ ) and a larger α value of -1.004 mV K-1 being found in the Rb+ system are observed. With a view to practical application, a full cell is constructed for low-grade heat harvesting. The resultant ηe is 4.34% when TREC operates between 10 and 50 °C, which further reaches 6.21% when 50% heat recuperation is considered. This efficiency equals to 50% of the Carnot efficiency, which is thought to be the highest ηe reported for low-grade heat harvesting systems. This study provides a fundamental understanding of the mechanisms governing the TREC, and the demonstrated efficient system paves the way for low-grade heat harvesting. |
| first_indexed | 2024-10-01T07:41:24Z |
| format | Journal Article |
| id | ntu-10356/160725 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:41:24Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1607252022-08-01T08:38:32Z Efficient low-grade heat harvesting enabled by tuning the hydration entropy in an electrochemical system Gao, Caitian Liu, Yezhou Chen, Bingbing Yun, Jeonghun Feng, Erxi Kim, Yeongae Kim, Moobum Choi, Ahreum Lee, Hyun-Wook Lee, Seok Woo School of Electrical and Electronic Engineering School of Materials Science and Engineering Engineering::Materials Energy Conversion Efficiency Hydration Entropy Harvesting of low-grade heat (<100 °C) is promising, but its application is hampered by a lack of efficient and low-cost systems. The thermally regenerative electrochemical cycle (TREC) is a potential alternative system with high energy-conversion efficiency. Here, the temperature coefficient (α), which is a key factor in a TREC, is studied by tuning the hydration entropy of the electrochemical reaction. The change of α in copper hexacyanoferrate (CuHCFe) with intercalation of different monovalent cations (Na+ , K+ , Rb+ , and Cs+ ) and a larger α value of -1.004 mV K-1 being found in the Rb+ system are observed. With a view to practical application, a full cell is constructed for low-grade heat harvesting. The resultant ηe is 4.34% when TREC operates between 10 and 50 °C, which further reaches 6.21% when 50% heat recuperation is considered. This efficiency equals to 50% of the Carnot efficiency, which is thought to be the highest ηe reported for low-grade heat harvesting systems. This study provides a fundamental understanding of the mechanisms governing the TREC, and the demonstrated efficient system paves the way for low-grade heat harvesting. Ministry of Education (MOE) S.W.L. acknowledges the support by Academic Research Fund Tier 2 from Ministry of Education, Singapore under ref. No. MOE2019-T2-1-122. H.-W.L. acknowledges support from the Ministry of Trade, Industry and Energy/Korea Institute of Energy Technology Evaluation and Planning (MOTIE/KETEP) (20194010000100). 2022-08-01T08:38:32Z 2022-08-01T08:38:32Z 2021 Journal Article Gao, C., Liu, Y., Chen, B., Yun, J., Feng, E., Kim, Y., Kim, M., Choi, A., Lee, H. & Lee, S. W. (2021). Efficient low-grade heat harvesting enabled by tuning the hydration entropy in an electrochemical system. Advanced Materials, 33(13), 2004717-. https://dx.doi.org/10.1002/adma.202004717 0935-9648 https://hdl.handle.net/10356/160725 10.1002/adma.202004717 33594714 2-s2.0-85100906042 13 33 2004717 en MOE2019-T2-1-122 Advanced Materials © 2021 Wiley-VCH GmbH. All rights reserved. |
| spellingShingle | Engineering::Materials Energy Conversion Efficiency Hydration Entropy Gao, Caitian Liu, Yezhou Chen, Bingbing Yun, Jeonghun Feng, Erxi Kim, Yeongae Kim, Moobum Choi, Ahreum Lee, Hyun-Wook Lee, Seok Woo Efficient low-grade heat harvesting enabled by tuning the hydration entropy in an electrochemical system |
| title | Efficient low-grade heat harvesting enabled by tuning the hydration entropy in an electrochemical system |
| title_full | Efficient low-grade heat harvesting enabled by tuning the hydration entropy in an electrochemical system |
| title_fullStr | Efficient low-grade heat harvesting enabled by tuning the hydration entropy in an electrochemical system |
| title_full_unstemmed | Efficient low-grade heat harvesting enabled by tuning the hydration entropy in an electrochemical system |
| title_short | Efficient low-grade heat harvesting enabled by tuning the hydration entropy in an electrochemical system |
| title_sort | efficient low grade heat harvesting enabled by tuning the hydration entropy in an electrochemical system |
| topic | Engineering::Materials Energy Conversion Efficiency Hydration Entropy |
| url | https://hdl.handle.net/10356/160725 |
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