Insights into the Thermopower of Thermally Regenerative Electrochemical Cycle for Low Grade Heat Harvesting

Chun Cheng; Sijia Wang; Peng Tan; Yawen Dai; Jie Yu; Rui Cheng; Shien-Ping Feng; Meng Ni

doi:10.1021/acsenergylett.0c02322

Insights into the Thermopower of Thermally Regenerative Electrochemical Cycle for Low Grade Heat Harvesting

Chun Cheng, Sijia Wang, Peng Tan, Yawen Dai, Jie Yu, Rui Cheng, Shien-Ping Feng^*, Meng Ni^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

62 Citations (Scopus)

Abstract

The thermally regenerative electrochemical cycle (TREC) is a promising technology for converting low-grade heat (<100 °C) to electrical power. In this work, the TREC with the NiHCF cathode and Zn anode achieves a markedly high thermopower (α) of -1.575 mV K^-1 and a heat-to-electricity efficiency of 2.41% at the temperature difference of 30 °C (equivalent to 25.15% of Carnot efficiency), surpassing all the existing TREC systems. For the first time, the mixed membranes with mixed pH electrolytes are introduced in the TREC systems to boost α to a record-high value of -2.270 mV K^-1. The proposed thermodynamic framework advances the understanding on the origin of α and electrochemical potential, which will guide people to engineer TRECs.

Original language	English
Pages (from-to)	329-336
Journal	ACS Energy Letters
Volume	6
Issue number	2
Online published	31 Dec 2020
DOIs	https://doi.org/10.1021/acsenergylett.0c02322
Publication status	Published - 12 Feb 2021
Externally published	Yes

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@article{32fa249bfa71417dbd989eb97f05e994,

title = "Insights into the Thermopower of Thermally Regenerative Electrochemical Cycle for Low Grade Heat Harvesting",

abstract = "The thermally regenerative electrochemical cycle (TREC) is a promising technology for converting low-grade heat (<100 °C) to electrical power. In this work, the TREC with the NiHCF cathode and Zn anode achieves a markedly high thermopower (α) of -1.575 mV K-1 and a heat-to-electricity efficiency of 2.41% at the temperature difference of 30 °C (equivalent to 25.15% of Carnot efficiency), surpassing all the existing TREC systems. For the first time, the mixed membranes with mixed pH electrolytes are introduced in the TREC systems to boost α to a record-high value of -2.270 mV K-1. The proposed thermodynamic framework advances the understanding on the origin of α and electrochemical potential, which will guide people to engineer TRECs.",

author = "Chun Cheng and Sijia Wang and Peng Tan and Yawen Dai and Jie Yu and Rui Cheng and Shien-Ping Feng and Meng Ni",

year = "2021",

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doi = "10.1021/acsenergylett.0c02322",

language = "English",

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TY - JOUR

T1 - Insights into the Thermopower of Thermally Regenerative Electrochemical Cycle for Low Grade Heat Harvesting

AU - Cheng, Chun

AU - Wang, Sijia

AU - Tan, Peng

AU - Dai, Yawen

AU - Yu, Jie

AU - Cheng, Rui

AU - Feng, Shien-Ping

AU - Ni, Meng

PY - 2021/2/12

Y1 - 2021/2/12

N2 - The thermally regenerative electrochemical cycle (TREC) is a promising technology for converting low-grade heat (<100 °C) to electrical power. In this work, the TREC with the NiHCF cathode and Zn anode achieves a markedly high thermopower (α) of -1.575 mV K-1 and a heat-to-electricity efficiency of 2.41% at the temperature difference of 30 °C (equivalent to 25.15% of Carnot efficiency), surpassing all the existing TREC systems. For the first time, the mixed membranes with mixed pH electrolytes are introduced in the TREC systems to boost α to a record-high value of -2.270 mV K-1. The proposed thermodynamic framework advances the understanding on the origin of α and electrochemical potential, which will guide people to engineer TRECs.

AB - The thermally regenerative electrochemical cycle (TREC) is a promising technology for converting low-grade heat (<100 °C) to electrical power. In this work, the TREC with the NiHCF cathode and Zn anode achieves a markedly high thermopower (α) of -1.575 mV K-1 and a heat-to-electricity efficiency of 2.41% at the temperature difference of 30 °C (equivalent to 25.15% of Carnot efficiency), surpassing all the existing TREC systems. For the first time, the mixed membranes with mixed pH electrolytes are introduced in the TREC systems to boost α to a record-high value of -2.270 mV K-1. The proposed thermodynamic framework advances the understanding on the origin of α and electrochemical potential, which will guide people to engineer TRECs.

UR - http://www.scopus.com/inward/record.url?scp=85100000424&partnerID=8YFLogxK

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85100000424&origin=recordpage

U2 - 10.1021/acsenergylett.0c02322

DO - 10.1021/acsenergylett.0c02322

M3 - RGC 21 - Publication in refereed journal

SN - 2380-8195

VL - 6

SP - 329

EP - 336

JO - ACS Energy Letters

JF - ACS Energy Letters

IS - 2

ER -

Insights into the Thermopower of Thermally Regenerative Electrochemical Cycle for Low Grade Heat Harvesting

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