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Title: Continuous thermally regenerative electrochemical systems for directly converting low-grade heat to electricity
Authors: Li, Xiaoya
Li, Jia
Yun, Jeonghun
Wu, Angyin
Gao, Caitian
Lee, Seok Woo
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2022
Source: Li, X., Li, J., Yun, J., Wu, A., Gao, C. & Lee, S. W. (2022). Continuous thermally regenerative electrochemical systems for directly converting low-grade heat to electricity. Nano Energy, 101, 107547-.
Project: MOE2019-T2-1-122 
Journal: Nano Energy 
Abstract: Thermally regenerative electrochemical cycle (TREC) system, which converts heat to electricity by charging at a lower voltage and discharging at a higher voltage, is a promising technology with high energy conversion efficiency for low-grade heat recovery. However, its charging process consumes additional energy and breaks the continuity of power generation. Herein, we present a continuously operated TREC system for direct heat-to-electricity conversion. In this system, two identical electrochemical cells operating at different temperatures are combined in a unit; thus, electricity can be generated continuously by periodically alternating between two temperatures. This concept is mainly demonstrated with a copper hexacyanoferrate cathode and a Cu/Cu2+ anode, with this system achieving an energy conversion efficiency of 1.76% (14.19% of Carnot efficiency) when operated between 10 and 50 °C without heat recuperation effects. Even at an ultralow temperature difference of 10 °C vs room temperature, its efficiency is 0.98%. The proposed system allows great freedom in electrode material selection as proven by another system with nickel hexacyanoferrate cathode and Ag/AgCl anode, thereby improving the flexibility and practicability of TREC systems in low-grade heat harvesting.
ISSN: 2211-2855
DOI: 10.1016/j.nanoen.2022.107547
Schools: School of Electrical and Electronic Engineering 
Research Centres: Rolls-Royce@NTU Corporate Lab 
Rights: © 2022 Elsevier Ltd. All rights reserved. This paper was published in Nano Energy and is made available with permission of Elsevier Ltd.
Fulltext Permission: embargo_20241107
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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