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. 2017 May 6;9(4):45. doi: 10.1007/s40820-017-0146-4

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© The Author(s) 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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.

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Fig. 7 — Invention and working principle of the first TENG that converts mechanical energy into electricity. a The construction and photography images in bending and releasing process and related electrical measurement tests. b Sketches that illustrate the operating principle. Figures adapted from [11, 74]