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. 2020 Jun 8;11:2868. doi: 10.1038/s41467-020-16642-6

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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. 3 — a Comparison of the I_SC between the 3DB-TENG and a multilayered 2D triaxial braided TENG fabric. Their respective photographs and structural diagrams are displayed at the bottom. b Structural diagrams (top) and photograph images (bottom) of the 3DB-TENGs with square-shaped (left) and toroidal-shaped (right) cross sections. c Comparison of the power densities of the rectangle-shaped, square-shaped, and toroidal-shaped 3DB-TENGs. d Effect of the number of braided yarns (3 × 3, 5 × 5, 7 × 7 and 9 × 9) on the power output of the 3DB-TENGs. e, f Comparisons of the (e) current and (f) power of the square-shaped 3DB-TENGs with different number of braided yarns. g Effect of the surface braiding angles (30°, 45°, and 60°) on the electrical output of the 3DB-TENGs. h, i Comparisons of the (h) current and (i) power of the square-shaped 3DB-TENGs with different surface braiding angles. The error bar indicates the range within a standard deviation. Source data are provided as a Source data file.