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. 2021 Dec 1;8:37. doi: 10.1186/s40580-021-00289-0

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© The Author(s) 2021

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 6 — Classification of 3D printed energy harvesting devices based on working principle a 3D printed flexible triboelectric nanogenerator as a self-powered electro-Fenton degradation system [29] b 3D-printed piezoelectric device for self-powered sensor application [33] c 3D-printed stretchable piezoelectric nanogenerator with non-protruding kirigami structure [34] d 3D printed BiSbTe thermoelectric generator [35] e Thermoelectric device composed of a p-type and n-type organic superlattice film deposited onto the flexible PET substrate [36] f 3D printed miniature electromagnetic energy harvester driven by airflow [26] g 3D printed hybrid 3D activity inertial sensor based on EMG, TENG and PENG nanogenerators [37] (Images are re-used with the permission of the publisher)