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More Powerful Twistron Carbon Nanotube Yarn Mechanical Energy Harvesters

Title
More Powerful Twistron Carbon Nanotube Yarn Mechanical Energy Harvesters
Author
김선정
Keywords
biscrolling; carbon nanotube yarn; incandescent tension annealing; mechanical energy harvesting; ocean-wave harvesting; self-powered sensors; twistrons
Issue Date
2022-07
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED MATERIALS, v. 34, NO. 27, article no. 2201826, Page. 1-10
Abstract
Stretching a coiled carbon nanotube (CNT) yarn can provide large, reversible electrochemical capacitance changes, which convert mechanical energy to electricity. Here, it is shown that the performance of these "twistron" harvesters can be increased by optimizing the alignment of precursor CNT forests, plastically stretching the precursor twisted yarn, applying much higher tensile loads during precoiling twist than for coiling, using electrothermal pulse annealing under tension, and incorporating reduced graphene oxide nanoplates. The peak output power for a 1 and a 30 Hz sinusoidal deformation are 0.73 and 3.19 kW kg(-1), respectively, which are 24- and 13-fold that of previous twistron harvesters at these respective frequencies. This performance at 30 Hz is over 12-fold that of other prior-art mechanical energy harvesters for frequencies between 0.1 and 600 Hz. The maximum energy conversion efficiency is 7.2-fold that for previous twistrons. Twistron anode and cathode yarn arrays are stretched 180 degrees out-of-phase by locating them in the negative and positive compressibility directions of hinged wine-rack frames, thereby doubling the output voltage and reducing the input mechanical energy.
URI
https://onlinelibrary.wiley.com/doi/10.1002/adma.202201826https://repository.hanyang.ac.kr/handle/20.500.11754/178005
ISSN
0935-9648;1521-4095
DOI
10.1002/adma.202201826
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ELECTRICAL AND BIOMEDICAL ENGINEERING(전기·생체공학부) > Articles
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