Whole garment knitting-enabled direct current triboelectric nanogenerators

Abstract

Wearable electronics require compact, reliable, and sustainable power sources. Fabric-based triboelectric nanogenerators (TENGs) offer a promising solution by combining energy harvesting with the inherent softness and breathability of textiles. However, conventional functionalization methods, such as surface coatings or multilayer structures, inevitably diminish these essential properties. To address this issue, we developed a knitted fabric-based direct current triboelectric nanogenerator (KF DC-TENG) using whole-garment knitting technology and the air breakdown effect. This design allows direct application without complex post-processing and eliminates the need for external rectification. A single unit of KF DC-TENG (8 × 2.5 cm²), after structural optimization, is capable of lighting 744 series-connected Light Emitting Diodes (LEDs) when manually rubbed against polytetrafluoroethylene (PTFE) fabric. Integration with a low-cost power management circuit (PMC, ~1.5 CNY) further enhances the output power by 290 times. As a result, 17 s of friction can power an electronic watch for up to 8 min. Moreover, continuous sliding can sustain a 1.5 W LED without noticeable flickering. This work presents the first demonstration of integrating whole-garment knitting technology with DC-TENGs, offering a scalable and cost-effective strategy for self-powered wearable electronics.

Keywords

Direct current / triboelectric nanogenerator / knitting technology / power management circuit / air breakdown

References

[1] Aouedi O.,Vu T.,Sacco A..et al. A survey on intelligent internet of things: applications, security, privacy, and future directions IEEE Commun. Surv. Tutorials 2025 27 1238 92

[2] Qi W.,Xu X.,Qian K.,Schuller B. W.,Fortino G.,Aliverti A.. A review of AIoT-based human activity recognition: from application to technique IEEE J. Biomed. Health Inform. 2025 29 2425 38

[3] He L.,Gao Y.,Yao S..et al. A Multifunctional power textile based on interfacial electrostatic breakdown Adv. Funct. Mater. 2025 35 e09809

[4] Dong K.,Wang Y. C.,Deng J..et al. A Highly stretchable and washable all-yarn-based self-charging knitting power textile composed of fiber triboelectric nanogenerators and supercapacitors ACS Nano 2017 11 9490 9

[5] Wang S.,Gao J.,Lu F..et al. Human motion recognition by a shoes-floor triboelectric nanogenerator and its application in fall detection Nano Energy 2023 108 108230

[6] Dong K.,Wu Z.,Deng J..et al. A stretchable yarn embedded triboelectric nanogenerator as electronic skin for biomechanical energy harvesting and multifunctional pressure sensing Adv. Mater. 2018 30 e1804944

[7] Pan Y.,Xu K.,Wang R.,Wang H.,Chen G.,Wang K.. Lithium-ion battery condition monitoring: a frontier in acoustic sensing technology Energies 2025 18 1068

[8] Attia P. M.,Moch E.,Herring P. K.. Challenges and opportunities for high-quality battery production at scale Nat. Commun. 2025 16 611 PMC11725600

[9] Fan F.,Tian Z.,Lin Wang Z.. Flexible triboelectric generator Nano Energy 2012 1 328 34

[10] Kwak S. S.,Kim H.,Seung W.,Kim J.,Hinchet R.,Kim S. W.. Fully stretchable textile triboelectric nanogenerator with knitted fabric structures ACS Nano 2017 11 10733 41

[11] Wang Z. L.. Triboelectric nanogenerators as new energy technology and self-powered sensors - principles, problems and perspectives Faraday Discuss. 2014 176 447 58

[12] Wang S.,Lin L.,Wang Z. L.. Triboelectric nanogenerators as self-powered active sensors Nano Energy 2015 11 436 62

[13] Wu H.,Wang J.,Fu S..et al. A constant current triboelectric nanogenerator achieved by hysteretic and ordered charge migration in dielectric polymers Energy Environ. Sci. 2023 16 5144 53

[14] Gao S.,Wei H.,Wang J..et al. Self-powered system by a suspension structure-based triboelectric-electromagnetic-piezoelectric hybrid generator for unifying wind energy and vibration harvesting with vibration attenuation function Nano Energy 2024 122 109323

[15] Zhang C.,Zhou L.,Cheng P..et al. Surface charge density of triboelectric nanogenerators: theoretical boundary and optimization methodology Appl. Mater. Today 2020 18 100496

[16] Sun D.,Song W.,Li C..et al. High-voltage direct current triboelectric nanogenerator based on charge pump and air ionization for electrospinning Nano Energy 2022 101 107599

[17] Cui S.,Liu D.,Yang P..et al. Triboelectric-material-pairs selection for direct-current triboelectric nanogenerators Nano Energy 2023 112 108509

[18] Zhao Z.,Zhou L.,Li S..et al. Selection rules of triboelectric materials for direct-current triboelectric nanogenerator Nat. Commun. 2021 12 4686 PMC8333059

[19] Li S.,Zhao Z.,Liu D..et al. A self-powered dual-type signal vector sensor for smart robotics and automatic vehicles Adv. Mater. 2022 34 e2110363

[20] Wang Z.,Zhang Z.,Chen Y..et al. Achieving an ultrahigh direct-current voltage of 130 V by semiconductor heterojunction power generation based on the tribovoltaic effect Energy Environ. Sci. 2022 15 2366 73

[21] Lin S.,Lu Y.,Feng S.,Hao Z.,Yan Y.. A high current density direct-current generator based on a moving van der waals schottky diode Adv. Mater. 2019 31 e1804398

[22] Lin S.,Lin Wang Z.. The tribovoltaic effect Materials Today 2023 62 111 28

[23] Xu C.,Yu J.,Huo Z.,Wang Y.,Sun Q.,Wang Z. L.. Pursuing the tribovoltaic effect for direct-current triboelectric nanogenerators Energy Environ. Sci. 2023 16 983 1006

[24] Qiao G.,Wang J.,Yu X.,Jia R.,Cheng T.,Wang Z. L.. A bidirectional direct current triboelectric nanogenerator with the mechanical rectifier Nano Energy 2021 79 105408

[25] Fu S.,He W.,Wu H..et al. High output performance and ultra-durable dc output for triboelectric nanogenerator inspired by primary cell NanoMicro. Lett. 2022 14 155 PMC9346042

[26] Wang J.,Wu Z.,Pan L..et al. Direct-current rotary-tubular triboelectric nanogenerators based on liquid-dielectrics contact for sustainable energy harvesting and chemical composition analysis ACS Nano 2019 13 2587 98

[27] Zhang C.,Zhou T.,Tang W.,Han C.,Zhang L.,Wang Z. L.. Rotating‐disk‐based direct‐current triboelectric nanogenerator Adv. Energy Mater. 2014 4 1301798

[28] Furfari F.. A history of the Van de Graaff generator IEEE Ind. Appl. Mag. 2005 11 10 4

[29] Yang Y.,Zhang H.,Wang Z. L.. Direct‐current triboelectric generator Adv. Funct. Mater. 2014 24 3745 50

[30] Liu D.,Yin X.,Guo H..et al. A constant current triboelectric nanogenerator arising from electrostatic breakdown Sci. Adv. 2019 5 eaav6437 PMC6450689

[31] Chen C.,Guo H.,Chen L..et al. Direct current fabric triboelectric nanogenerator for biomotion energy harvesting ACS Nano 2020 14 4585 94

[32] Wang F.,Tian J.,Ding Y..et al. A universal managing circuit with stabilized voltage for maintaining safe operation of self-powered electronics system iScience 2021 24 102502 PMC8170003

[33] Wu H.,Shan C.,Fu S..et al. Efficient energy conversion mechanism and energy storage strategy for triboelectric nanogenerators Nat. Commun. 2024 15 6558 PMC11297214

[34] Wang Q.,Hu D.,Huang X..et al. Achieving high performance of triboelectric nanogenerators via voltage boosting strategy Adv. Funct. Mater. 2024 34 2409088

[35] Li M.,Zhang Y.,Wang H..et al. Performance enhancement of self-charging system by combining triboelectric nanogenerators and dielectric capacitors Nano Energy 2024 119 109073

[36] Cheng G.,Lin Z. H.,Lin L.,Du Z. L.,Wang Z. L.. Pulsed nanogenerator with huge instantaneous output power density ACS Nano 2013 7 7383 91

[37] Harmon W.,Bamgboje D.,Guo H.,Hu T.,Wang Z. L.. Self-driven power management system for triboelectric nanogenerators Nano Energy 2020 71 104642

[38] Liu W.,Wang Z.,Wang G..et al. Switched-capacitor-convertors based on fractal design for output power management of triboelectric nanogenerator Nat. Commun. 2020 11 1883 PMC7171113

[39] Yang J.,Yang F.,Zhao L..et al. Managing and optimizing the output performances of a triboelectric nanogenerator by a self-powered electrostatic vibrator switch Nano Energy 2018 46 220 8

[40] Wang Z.,Liu W.,Hu J..et al. Two voltages in contact-separation triboelectric nanogenerator: From asymmetry to symmetry for maximum output Nano Energy 2020 69 104452

[41] Cheng R.,Dong K.,Chen P..et al. High output direct-current power fabrics based on the air breakdown effect Energy Environ. Sci. 2021 14 2460 71

[42] Cheng R.,Ning C.,Chen P..et al. Enhanced output of on‐body direct‐current power textiles by efficient energy management for sustainable working of mobile electronics Adv. Energy Mater. 2022 12 2201532

[43] Yi Z.,Liu D.,Zhou L..et al. Enhancing output performance of direct-current triboelectric nanogenerator under controlled atmosphere Nano Energy 2021 84 105864

[44] Jiang Y.,An J.,Liang F..et al. Knitted self-powered sensing textiles for machine learning-assisted sitting posture monitoring and correction Nano Res. 2022 15 8389 97

[45] Dong S.,Xu F.,Sheng Y.,Guo Z.,Pu X.,Liu Y.. Seamlessly knitted stretchable comfortable textile triboelectric nanogenerators for E-textile power sources Nano Energy 2020 78 105327

[46] Wang Z.,Ruan Z.,Ng W. S..et al. Integrating a triboelectric nanogenerator and a zinc‐ion battery on a designed flexible 3D spacer fabric Small Methods 2018 2 1800150

[47] He M.,Du W.,Feng Y..et al. Flexible and stretchable triboelectric nanogenerator fabric for biomechanical energy harvesting and self-powered dual-mode human motion monitoring Nano Energy 2021 86 106058

[48] Lv T.,Cheng R.,Wei C..et al. All‐fabric direct‐current triboelectric nanogenerators based on the tribovoltaic effect as power textiles Adv. Energy Mater. 2023 13 2301178