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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. 4 — a Time-domain output voltages with different numbers of power generation units of the W-TENG under 50 MΩ; b, c output powers with different numbers of power generation units versus load resistance optimization in the range of 3–105 MΩ; d open-circuit voltage versus number of power generation units; e optimum load resistance versus number of power generation units; f output voltage and current variations with load resistance ranging from 100 kΩ to 110 MΩ for eight power generation units