期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 31, 页码 37306-37312出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c12443
关键词
self-powered; thermogalvanic generator; hydrogels; wearable electronics; health monitoring
资金
- Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi (STIP) [201802028]
- Shanxi Scholarship Council of China [HGKY2019022]
- Youth Top Talent Program of Shanxi Province (2018)
This research focuses on converting body heat into electricity by fabricating a flexible thermogalvanic generator with Fe3+/Fe2+ as a redox pair. By incorporating a polyvinylidene fluoride diaphragm in the gel electrolyte, the Seebeck coefficient was effectively improved, leading to the establishment of a self-powered body temperature monitoring system.
There is always a temperature difference of more than 10 degrees between the human body, as a sustainable heat source, and the ambient temperature. Converting body heat into electricity that in turn is used to drive personal medical electronics is of significance in smart wearable medicine. To avoid the frangibility and complex preparation of traditional thermoelectric materials, we fabricated a gel electrolyte-based thermogalvanic generator with Fe3+/Fe2+ as a redox pair, which presents not only moderate thermoelectric performance but also excellent flexibility. With a micropore-widespread polyvinylidene fluoride diaphragm implanted in the gel, a thermal barrier was created between the two halves, effectively improving the Seebeck coefficient by reducing its thermal conductivity. Considering the superior temperature response of the gel, a self-powered body temperature monitoring system was established by conformally affixing it to the forehead. Meanwhile, the gel patch with a high specific heat capacity can effectively cool down fever patients. This work may offer a new train of thought for exploiting self-powered wearable medical electronics by scavenging low-grade body heat.
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