Please use this identifier to cite or link to this item: https://doi.org/10.1002/adma.202202266
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dc.titleEfficient low-grade heat conversion and storage with an activity-regulated redox flow cell via thermally regenerative electrochemical cycle.
dc.contributor.authorZhang, Hang
dc.contributor.authorLek, Dao Gen
dc.contributor.authorHuang, Shiqiang
dc.contributor.authorLee, Yann Mei
dc.contributor.authorWang, Qing
dc.date.accessioned2022-07-22T03:54:23Z
dc.date.available2022-07-22T03:54:23Z
dc.date.issued2022-06-29
dc.identifier.citationZhang, Hang, Lek, Dao Gen, Huang, Shiqiang, Lee, Yann Mei, Wang, Qing (2022-06-29). Efficient low-grade heat conversion and storage with an activity-regulated redox flow cell via thermally regenerative electrochemical cycle.. Adv Mater : e2202266-. ScholarBank@NUS Repository. https://doi.org/10.1002/adma.202202266
dc.identifier.issn0935-9648
dc.identifier.issn1521-4095
dc.identifier.urihttps://scholarbank.nus.edu.sg/handle/10635/229053
dc.description.abstractEfficient and cost-effective technologies are highly desired to convert the tremendous amount of low-grade waste heat to electricity. Although thermally regenerative electrochemical cycle (TREC) has attracted increasing attention recently, the unsatisfactory thermal-to-electrical conversion efficiency and low power density limit its practical applications. In this work, we demonstrate a thermosensitive Nernstian-potential-driven strategy in TREC system to boost its temperature coefficient, power density and thermoelectric conversion efficiency by rationally regulating the activities of redox couples at different temperatures. With Zn anode and [Fe(CN)6 ]4-/3- -guanidinium as catholyte, the TREC flow cell presents an unprecedented average temperature coefficient of -3.28 mV/K, and has achieved an absolute thermoelectric efficiency of 25.1% and apparent thermoelectric efficiency of 14.9% relative to Carnot efficiency at the temperature range of 25-50 °C at 1 mA/cm2 . In addition, a thermoelectric power density of 1.98 mW/(m2 K2 ) has been demonstrated, which is more than 7 times the highest power density of reported TREC systems. This activity regulation strategy could inspire research into high-efficiency and high-power TREC devices for practical low-grade heat harnessing. This article is protected by copyright. All rights reserved.
dc.publisherWiley
dc.sourceElements
dc.subjecteffective activity regulation
dc.subjectenergy storage
dc.subjectlow-grade heat harnessing
dc.subjectredox flow battery
dc.subjectthermally regenerative electrochemical cycle
dc.typeArticle
dc.date.updated2022-07-21T08:07:00Z
dc.contributor.departmentDEPT OF MATERIALS SCIENCE & ENGINEERING
dc.contributor.departmentMATERIALS SCIENCE AND ENGINEERING
dc.description.doi10.1002/adma.202202266
dc.description.sourcetitleAdv Mater
dc.description.pagee2202266-
dc.published.stateUnpublished
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