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. 2023 Oct 26;14:6816. doi: 10.1038/s41467-023-42492-z

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© The Author(s) 2023

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 5 — a Thermal charging curves under various temperature differences. b Fitted Seebeck coefficient. c Thermal-induced current density (hollow symbol) and power density (solid symbol). d Thermal stability with a loading resistance of 10 kΩ. e Digital photo of a white LED lighted by three ZTCCs in series. f Illustration for health monitoring system. g Body heat-charged health monitoring system and h the recorded data.