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Title: Efficient low-grade heat harvesting enabled by tuning the hydration entropy in an electrochemical system
Authors: Gao, Caitian
Liu, Yezhou
Chen, Bingbing
Yun, Jeonghun
Feng, Erxi
Kim, Yeongae
Kim, Moobum
Choi, Ahreum
Lee, Hyun-Wook
Lee, Seok Woo
Keywords: Engineering::Materials
Issue Date: 2021
Source: 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-.
Project: MOE2019-T2-1-122
Journal: Advanced Materials
Abstract: 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.
ISSN: 0935-9648
DOI: 10.1002/adma.202004717
Schools: School of Electrical and Electronic Engineering 
School of Materials Science and Engineering 
Rights: © 2021 Wiley-VCH GmbH. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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