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. 2020 Aug 26;11:4277. doi: 10.1038/s41467-020-18086-4

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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. 2 — a Output charge of double-bottom-electrode S-TENG with different inner electrode gaps when grounded switch is OFF/ON. b Output charge and current of CSA-S-TENG with fixed electrode gap while varying sliding range (speed fixed at 4 cm s⁻¹). c Transferred charge of CSA-S-TENG with different inner electrode gaps when grounded switch is OFF/ON. d Output charge and current of CSA-S-TENG with fixed bottom electrode gap while varying sliding speed (range fixed at 76.5 mm). e, f Output charge of single electrode CSA-S-TENG with fixed stationary material PA while varying sliding materials (FEP, PTFE and Kapton) and fixed sliding material PA while varying stationary materials (FEP, PTFE and Kapton), respectively. Optimized output charge density of g double electrode and h single electrode CSA-S-TENG with grounded switch OFF/ON.