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Updated: Aug 6, 2026
09:09
Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation
Published on: February 5, 2020
Scale-bridging interface design enables high-performance sustainable thermoelectrics
Gang Wu1, Airan Li1, Xinzhi Wu1
1Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Tsukuba, Japan.
Nature Communications
|July 18, 2026
Summary
This study introduces a new interface design for thermoelectric devices, enhancing energy efficiency. The approach improves material performance and durability for effective low-grade heat harvesting.
Area of Science:
- Materials Science
- Energy Harvesting
- Solid-State Physics
Background:
- Sustainable thermoelectric technologies are crucial for harvesting low-grade heat and improving energy efficiency.
- High-performance and durable thermoelectric systems face challenges due to coupled transport and multiscale optimization.
Purpose of the Study:
- To establish a scale-bridging interface-centric design strategy for thermoelectric materials.
- To link macroscopic junction engineering with microscopic interface modulation for enhanced performance.
Main Methods:
- Utilized n-type Mg3(Sb, Bi)2 as a representative system.
- Translated Mg2Ni into a scale-bridging interfacial phase for improved junctions and interface modulation.
- Investigated the effects of Mg2Ni as both an internal modifier and an external barrier layer.
Main Results:
- Achieved an average figure of merit (zT) of 1.5 over 300 to 723 K with high thermal stability.
- Developed a two-pair thermoelectric module with a stable conversion efficiency of 8.3% using Mg2Ni and p-type MgAgSb.
- Demonstrated superior performance compared to representative Bi2Te3-based modules.
Conclusions:
- Established a practical framework for efficient and durable thermoelectric energy conversion through bridging interface design.
- Highlighted the potential of scale-bridging interfaces for optimizing thermoelectric device performance.
- Provided a route for advancing sustainable thermoelectric technologies.
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