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. 2021 Aug 3;12:4686. doi: 10.1038/s41467-021-25046-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. 1 — a Schematic diagram of DC-TENG. b The friction coefficient (μ) between Cu with various triboelectric layers and the polarization intensity of triboelectric layers at 10 kV cm⁻¹ (error bars represent standard deviation). c The surface charge density of different triboelectric layers. d The electric field distribution curves in the gap between CCE and triboelectric layers’ surface (simulated by COMSOL software) and e corresponding summary of average electric field (the inset is the simulated result of PVC film).