期刊
NANO ENERGY
卷 92, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2021.106738
关键词
ionic thermoelectric systems; thermopower; ion transport; double-network hydrogel; low-grade heat harvesting; 2D-diffusion-ordered spectroscopy
类别
资金
- General Research Fund of the Research Grants Council of Hong Kong Special Administrative Region, China [17206519, 17206518]
- MIT Mechanical Engineering and SUSTech
The research frontier of harvesting low-grade heat as a source of electrical power for self-powered wearable devices has shown promise, but current attainable thermopowers and constraints of rigid or complicated thermoelectric systems have hindered progress. By assembling porous electrodes and hybrid hydrogel, an ultrahigh thermopower of 19.32 mV K-1 was achieved on a stretchable thermoelectric module. This design provides an effective strategy to increase thermopower by regulating ion transport, resulting in high output power density, tailorable architecture, and excellent stretchability showcased in a thermoelectric wristband for body heat recovery.
Harvesting low-grade heat as source of electrical power has emerged as a research frontier for self-powered wearable devices, as a promising route to overcome challenges associated with limited access to grid power. However, such promise is compromised by current attainable thermopowers and constraints of rigid or complicated thermoelectric systems. We report an ultrahigh thermopower of 19.32 mV K-1 on a stretchable thermoelectric module by the assembly of porous electrodes and hybrid hydrogel, containing 1-ethyl-3-methylimidazolium and tetrafluoroborate ions and polyethylene glycol. The anions act as charge carrier; for the first time, distinct ion mobilities are directly measured by 2D-diffusion-ordered nuclear magnetic resonance spectroscopy. By regulating ion transport via the synergy of selective ion-localization and thermo-osmotic mechanism, such design provides an effective strategy to increase thermopower, and our device is endowed with high output power density, tailorable architecture, and excellent stretchability, which is showcased in a thermoelectric wristband for body heat recovery.
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