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. 2021 Mar 17;7:25. doi: 10.1038/s41378-021-00248-z

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© The Author(s) 2021

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. 3 — a Self-powered epidermal electronics with the tactile sensing function. Reprinted from ref. ⁸⁴ with permission. b Flexible wearable pressure sensor based on piezoelectric materials. Reprinted from ref. ⁸⁵ with permission. c The new kind of self-powered strain sensor based on redox electricity. Reprinted from ref. ⁸⁶ with permission. d Active humidity sensor based on a moisture-driven electrical generator. Reprinted from ref. ⁸⁷ with permission. e Self-powered thermoelectric glucose sensing system integrating the wearable thermoelectric generator (WTEG). Reprinted from ref. ⁸⁸ with permission. f Self-powered glucose sensing smart watch based on photovoltaic cells. Reprinted from ref. ⁸⁹ with permission. g Flexible perspiration-powered electronic skin (PPES). Reprinted from ref. ⁹⁰ with permission.