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Updated: Jul 4, 2025

Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation

Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation

Published on: February 5, 2020

High-performance cryo-temperature ionic thermoelectric liquid cell developed through a eutectic solvent strategy.

Shuaihua Wang¹, Yuchen Li¹, Mao Yu¹

¹Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, China.

Nature Communications

|February 8, 2024

Summary

This summary is machine-generated.

Researchers developed a novel ionic thermoelectric (i-TE) liquid cell using a deep eutectic solvent, enabling efficient low-grade heat recovery at cryo-temperatures down to -35°C.

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Area of Science:

Materials Science
Energy Conversion
Electrochemistry

Background:

Ionic thermoelectric (i-TE) liquid cells offer sustainable low-grade heat recovery.
Aqueous electrolytes limit i-TE cells to temperatures above their freezing point.
Developing cryo-temperature compatible i-TE systems is crucial for cold environments.

Purpose of the Study:

To engineer a high-performance i-TE liquid cell capable of operating at sub-zero temperatures.
To overcome the freezing point limitation of traditional aqueous electrolytes.
To demonstrate the potential of i-TE technology for heat recovery in frigid regions.

Main Methods:

Fabrication of a deep eutectic solvent using formamide and water to create an anti-freezing electrolyte.
Synergistic optimization of electrode materials and cell architecture.
Performance characterization of the i-TE liquid cell at cryogenic temperatures.

Main Results:

The developed i-TE liquid cell operates effectively down to -35°C.
Achieved a power density of 17.5 W/m² and a 2-hour energy density of 27 kJ/m² at a temperature gradient of 105°C (cold end: -35°C, hot end: 70°C).
A prototype 25-cell module generated an open-circuit voltage of 6.9 V, a short-circuit current of 68 mA, and a maximum power of 131 mW.

Conclusions:

The deep eutectic solvent strategy enables robust i-TE liquid cells for cryo-temperature applications.
The high power output and anti-freezing capability make this system suitable for heat recovery in extreme cold.
This advancement expands the operational range and applicability of i-TE technology.