Porous PDMS conformable coating for high power output carbon fibers/ZnO nanorod-based triboelectric energy harvesters

Research output: Contribution to journalArticlepeer-review

Abstract

A new method for depositing PDMS directly onto conductive carbon yarns is proposed to produce Triboelectric Nanogenerator Yarns (TENG yarns) that can serve as the basic building blocks for energy scavenging wearables. The in-situ PDMS curing method described in this study allows the fast formation of a uniform thick coating over conductive surfaces regardless of their roughness. Single-electrode configuration TENG yarns are developed and their electrical output is optimized by precisely adjusting the PDMS layer thickness and by changing the chemical and physical nature of the carbon fiber (CF) yarns’ surface. Functionalizing the CF yarns’ surface with ZnO rods combined with porous PDMS coating can enhance their electrical output. The best results are achieved using this type of TENG yarns with an average diameter of 1.74 mm, which can be obtained after only 3 min of PMDS deposition by “in-situ” curing method. A maximum of 72 V peak-to-peak and 10 µA (74.1 µW cm−2 of power density with a load resistance of 20 MΩ) is reached when applying an impact force of 600 N to a set of five TENG yarns connected in parallel. The output is stable even after 10,000 cycles and this set of TENG yarns is also able to light at least 28 LEDs when tapping by hand, proving a contribute towards the development of basic building blocks to power the future generation of wearables.

Original languageEnglish
Article number106582
JournalNano Energy
Volume90
Issue numberPart B
DOIs
Publication statusPublished - Dec 2021

Keywords

  • Carbon fiber-based nanogenerators
  • Joule heat-induced in situ curing
  • PDMS
  • TENG yarns
  • Yarn-based triboelectric nanogenerators
  • ZnO rods

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