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Updated: Oct 11, 2025

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

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Published on: February 5, 2020

Tunable solid-state thermal rectification by asymmetric nonlinear radiation.

Junbyeong Lee¹, Agha Aamir Jan, Shraddha Prakash Ganorkar

¹School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea. dongwoolee@skku.edu sbaik@skku.edu.

Materials Horizons

|November 30, 2021

Summary

This summary is machine-generated.

Researchers demonstrate tunable solid-state thermal rectification using asymmetric radiation. This breakthrough in heat transport control shows potential for advanced thermal management and logic devices.

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Last Updated: Oct 11, 2025

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Area of Science:

Condensed Matter Physics
Materials Science
Nanotechnology

Background:

Thermal rectification is a crucial phenomenon for controlling heat flow direction.
Existing methods often lack tunability or solid-state implementation.

Purpose of the Study:

To achieve tunable solid-state thermal rectification using asymmetric nonlinear far-field radiation.
To explore methods for enhancing thermal rectification ratios (TR) and active control.

Main Methods:

Fabrication of a three-terminal device with a metal film (niobium, copper, silver) sputtered on a polyethylene terephthalate strip.
Experimental measurement of thermal transport.
Finite element analysis (FEA) for simulation and optimization.

Main Results:

Achieved a thermal rectification ratio (TR) of 13.0% for a niobium-deposited device.
Simulations predicted TR enhancement to 74.5% by tuning thermal conductivity, emissivity, and surface area asymmetry.
Demonstrated active control of rectification, reaching a maximum TR of 93.1% by gating environmental temperature.

Conclusions:

Tunable solid-state thermal rectification is achievable via asymmetric radiation.
The developed device offers potential for on-demand heat control and thermal logic gates.
The approach is versatile across various temperatures and device scales.