结晶
热电效应
材料科学
溶解
热导率
卡诺循环
能量收集
热能
光电子学
化学
热力学
核工程
物理
复合材料
工程类
物理化学
功率(物理)
作者
Benhai Yu,Jiangjiang Duan,Hengjiang Cong,Wenke Xie,Rong Liu,Xinyan Zhuang,Hui Wang,Bei Qi,Ming Xu,Zhong Lin Wang,Jun Zhou
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2020-10-16
卷期号:370 (6514): 342-346
被引量:293
标识
DOI:10.1126/science.abd6749
摘要
Low-grade heat (below 373 kelvin) is abundant and ubiquitous but is mostly wasted because present recovery technologies are not cost-effective. The liquid-state thermocell (LTC), an inexpensive and scalable thermoelectric device, may be commercially viable for harvesting low-grade heat energy if its Carnot-relative efficiency (ηr) reaches ~5%, which is a challenging metric to achieve experimentally. We used a thermosensitive crystallization and dissolution process to induce a persistent concentration gradient of redox ions, a highly enhanced Seebeck coefficient (~3.73 millivolts per kelvin), and suppressed thermal conductivity in LTCs. As a result, we achieved a high ηr of 11.1% for LTCs near room temperature. Our device demonstration offers promise for cost-effective low-grade heat harvesting.
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