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Lee, Hyun-Wook
Energy Storage and Electron Microscopy Laboratory
Research Interests
  • Energy storage, secondary batteries, transmission electron microscopy, real time analysis

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Efficient Low-Grade Heat Harvesting Enabled by Tuning the Hydration Entropy in an Electrochemical System

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Title
Efficient Low-Grade Heat Harvesting Enabled by Tuning the Hydration Entropy in an Electrochemical System
Author
Gao, CaitianLiu, YezhouChen, BingbingYun, JeonghunFeng, ErxiKim, YeongaeKim, MoobumChoi, AhreumLee, Hyun-WookLee, Seok Woo
Issue Date
2021-04
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED MATERIALS, v.33, no.13, pp.2004717
Abstract
Harvesting of low-grade heat (<100 degrees 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 (alpha), which is a key factor in a TREC, is studied by tuning the hydration entropy of the electrochemical reaction. The change of alpha in copper hexacyanoferrate (CuHCFe) with intercalation of different monovalent cations (Na+, K+, Rb+, and Cs+) and a larger alpha 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 eta(e) is 4.34% when TREC operates between 10 and 50 degrees 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 eta(e) 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.
URI
https://scholarworks.unist.ac.kr/handle/201301/50176
URL
https://onlinelibrary.wiley.com/doi/10.1002/adma.202004717
DOI
10.1002/adma.202004717
ISSN
0935-9648
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