Giant thermopower of ionic gelatin near room temperature
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Author(s)
Han, Cheng-Gong
Qian, Xin
Li, Qikai
Deng, Biao
Zhu, Yongbin
Han, Zhijia
Zhang, Wenqing
Wang, Weichao
Feng, Shien-Ping
Chen, Gang
Date Issued
April 2020
Journal
Science
Publisher
American Association for the Advancement of Science (AAAS)
Citation
Han, Cheng-Gong et al. "Giant thermopower of ionic gelatin near room temperature." Science (April 2020): eaaz5045 © 2020 American Association for the Advancement of Science
Version
Author's final manuscript
Abstract
Harvesting heat from the environment into electricity has the potential to power Internet-of-Things (IoT) sensors, freeing them from cables or batteries especially for use as wearable devices. We demonstrate a giant positive thermopower of 17.0 mV K⁻¹ in a flexible, quasi-solid state, ionic thermoelectric material using synergistic thermodiffusion and thermogalvanic effects. The ionic thermoelectric material is a gelatin matrix modulated with ions providers (KCl, NaCl, and KNO₃) for thermodiffusion effect and redox couple (Fe(CN)₆⁴⁻/Fe(CN)₆³⁻ for thermogalvanic effect. A proof-of-concept wearable device consisting of 25 unipolar elements generated over 2 V and a peak power of 5 μW using body heat. This ionic gelatin shows promises for environmental heat-to-electric energy conversion utilizing ions as energy carriers.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1126/science.aaz5045
