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Phase Changes

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Related Experiment Video

Updated: Oct 23, 2025

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

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Published on: February 5, 2020

Thermal rectification in multilayer phase change material structures for energy storage applications.

Timm Swoboda¹, Katja Klinar², Shahzaib Abbasi¹

¹Department of Thermal and Fluid Engineering, University of Twente, Enschede, Overijssel 7500, The Netherlands.

|August 17, 2021

Summary

Researchers developed advanced solid-state thermal diodes using phase change materials for efficient energy management. These novel thermal diodes offer high rectification ratios and tunable thermal control for applications like heat storage.

Keywords:

energy engineering energy materials materials science

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Area of Science:

Materials Science
Thermodynamics
Energy Engineering

Background:

Solid-state thermal diodes enable asymmetric heat flow, crucial for energy management.
Existing phase-change material thermal diodes face limitations in size, rectification ratio, and thermal tunability.

Purpose of the Study:

To propose and investigate a novel multilayer thermal diode design.
To achieve enhanced thermal rectification and temperature-modulated control.

Main Methods:

Fabrication of a multilayer thermal diode combining phase change and invariant materials.
Experimental characterization of thermal transport properties and rectification ratios across a temperature range (300 K–500 K).

Main Results:

Achieved state-of-the-art thermal rectification ratios up to 136%.
Demonstrated distinct, temperature-switchable rectification states for advanced thermal control.
Analyzed the diode's effectiveness in enhancing heat retention in thermal storage systems.

Conclusions:

The proposed multilayer thermal diode offers superior performance and tunable control compared to existing devices.
This technology holds significant potential for improving thermal management in energy storage and other applications.