热力学
材料科学
热电材料
工程物理
化学
热电效应
物理
作者
Xin Qian,Zhihao Ma,Qiangqiang Huang,Haoran Jiang,Ronggui Yang
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2024-01-31
卷期号:: 679-706
标识
DOI:10.1021/acsenergylett.3c02448
摘要
More than half of the waste heat rejected into the environment has temperatures lower than 100 °C, which accounts for nearly 85 PWh/year worldwide. Efficiently harvesting low-grade heat could be a promising step toward carbon neutrality. Recent developments of ionic thermoelectrics (i-TE) with giant thermopower have provoked intensive interest in using ions as energy and charge carriers for efficient thermal energy harvesting. However, current literature primarily focuses on improving thermopower only, while the ion transport and thermodynamics affecting the efficiencies have been largely neglected. This Review clarifies the fundamentals of electrochemistry and thermodynamics for developing highly efficient i-TE devices. Two major types of i-TE devices, thermo-ionic capacitors (TICs) and thermogalvanic cells (TGCs), are discussed in detail. The Review analyzes the methods of enhancing ionic thermopower in the literature by taking an entropic point of view. We also derived modified thermoelectric factor Z for both TICs and TGCs that fully incorporate the dynamics of ion transport and electrochemical reactions. Recent developments of hybrid devices showing improved efficiencies, power density, and multifunctionality are reviewed. Finally, we comment on the remaining challenges and provide an outlook on future directions.
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