Mechanical energy harvesters with tensile efficiency of 17.4% and torsional efficiency of 22.4% based on homochirally plied carbon nanotube yarns
2024-03-13 17:56:23 조회수140
Mengmeng Zhang1,7, Wenting Cai1,2,7, Zhong Wang 1, Shaoli Fang1, Runyu Zhang 3, Hongbing Lu 3, Ali E. Aliev 1, Anvar A. Zakhidov 1, Chi Huynh 4, Enlai Gao 5, Jiyoung Oh 1, Ji Hwan Moon 6, Jong Woo Park 6, Seon Jeong Kim 6 & Ray H. Baughman 1 1 Alan G. MacDiarmid NanoTech Institute, University of Texas at Dallas, Richardson, TX, USA. 2 School of Chemistry, Xi’an Jiaotong University, Xi’an, China. 3 Department of Mechanical Engineering, University of Texas at Dallas, Richardson, TX, USA. 4 Nano-Science & Technology Center, Lintec of America, Plano, TX, USA. 5 Department of Engineering Mechanics, School of Civil Engineering, Wuhan University, Wuhan, China. 6 Center for Self-Powered Actuation, Department of Biomedical Engineering, Hanyang University, Seoul, South Korea. 원문 링크 :


Improved methods are needed for harvesting mechanical energy. Coiled carbon nanotube yarns, termed twistrons, use stretch-induced changes in electrochemical capacitance to convert mechanical energy to electricity. Elongation of the yarn produces such large lateral Poisson’s ratios that the yarns are highly stretch densified, which contributes to harvesting. Here we report plied twistrons, instead of coiled, which increase the energy conversion efficiency of the yarns from 7.6% to 17.4% for stretch and to 22.4% for twist. This is attributed to additional harvesting mechanisms by yarn stretch and lateral deformations. For harvesting between 2 and 120 Hz, our plied twistron has higher gravimetric peak power and average power than has been reported for non-twistron, material-based mechanical energy harvesters. We sew the twistrons into textiles for sensing and harvesting human motion, deploy them in salt water for harvesting ocean wave energy and use them to charge supercapacitors. 

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