Chemo-Mechanical Energy Harvesters with Enhanced Intrinsic Electrochemical Capacitance in Carbon Nanotube Yarns

Seongjae Oh, Keon Jung Kim, Byeonghwa Goh, Chae Lin Park, Gyu Dong Lee, Seoyoon Shin, Seungju Lim, Eun Sung Kim, Ki Ro Yoon, Changsoon Choi, Hyun Kim, Dongseok Suh, Joonmyung Choi, Shi Hyeong Kim

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Predicting and preventing disasters in difficult-to-access environments, such as oceans, requires self-powered monitoring devices. Since the need to periodically charge and replace batteries is an economic and environmental concern, energy harvesting from external stimuli to supply electricity to batteries is increasingly being considered. Especially, in aqueous environments including electrolytes, coiled carbon nanotube (CNT) yarn harvesters have been reported as an emerging approach for converting mechanical energy into electrical energy driven by large and reversible capacitance changes under stretching and releasing. To realize enhanced harvesting performance, experimental and computational approaches to optimize structural homogeneity and electrochemical accessible area in CNT yarns to maximize intrinsic electrochemical capacitance (IEC) and stretch-induced changes are presented here. Enhanced IEC further enables to decrease matching impedance for more energy efficient circuits with harvesters. In an ocean-like environment with a frequency from 0.1 to 1 Hz, the proposed harvester demonstrates the highest volumetric power (1.6–10.45 mW cm−3) of all mechanical harvesters reported in the literature to the knowledge of the authors. Additionally, a high electrical peak power of 540 W kg−1 and energy conversion efficiency of 2.15% are obtained from torsional and tensile mechanical energy.

Original languageEnglish
Article number2203767
JournalAdvanced Science
Volume9
Issue number32
DOIs
StatePublished - 14 Nov 2022

Bibliographical note

Publisher Copyright:
© 2022 The Authors. Advanced Science published by Wiley-VCH GmbH.

Keywords

  • carbon nanotubes
  • chemo-mechanical harvesters
  • energy harvesting
  • intrinsic electrochemical capacitance
  • matching impedance

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