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. 2020 Aug 10;6:56. doi: 10.1038/s41378-020-0163-1

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© The Author(s) 2020

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. 8 — a Power generation performance of the W-TENG after immersion treatment in water; b output performance comparison of two types of TENG devices: the proposed W-TENG with hermetically covered FEP electrets and the W-TENG with FEP electrets exposed to the outside; c experimental humid environment realized by a humidifier in closed chamber conditions; d snapshot demonstration of pressing the W-TENG to light up LEDs in the humid chamber; e experimental setup of immersing the fabricated W-TENG prototype in a water tank