Journal
ACS NANO
Volume 15, Issue 11, Pages 18172-18181Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.1c06985
Keywords
fabric triboelectric nanogenerator; waterproof; hydrophobic; self-repairing; droplet energy harvesting
Categories
Funding
- National Natural Science Foundation of China [22109012]
- Natural Science Foundation of the Beijing Municipality [2212052]
- Fundamental Research Funds for the Central Universities [E1E46805]
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This study reports an all-fabric TENG with good breathability and hydrophobic self-repairing properties, showing significant improvement in water droplet energy conversion efficiency, which can be used in multifunctional wearable devices for raindrop energy harvesting.
Triboelectric nanogenerators (TENGs) are useful for harvesting clean and widely distributed water droplet energy with high efficiency. However, the commonly used polymer films in TENGs for water droplet energy harvesting have the disadvantages of poor breathability, poor skin affinity, and irreparable hydrophobicity, which greatly hinder their wearable uses. Here, we report an all-fabric TENG (F-TENG), which not only has good air permeability and hydrophobic self-repairing properties but also shows effective energy conversion efficiency. The hydrophobic surface composed of SiO2 nanoparticles and poly(vinylidenefluoride-co-hexafluoropropylene)/perfluorodecyltrichlorosilane (PVDF-HFP/FDTS) exhibits a static contact angle of 157 degrees and displays excellent acid and alkali resistance. Because of its low glass transition temperature, PVDF-HFP can facilitate the movement of FDTS molecules to the surface layer under heating conditions, realizing hydrophobic self-repairing performance. Furthermore, with the optimized compositions and structure, the water droplet F-TENG shows 7-fold enhancement of output voltage compared with the conventional single-electrode mode TENG, and a total energy conversion efficiency of 2.9% is achieved. Therefore, the proposed F-TENG can be used in multifunctional wearable devices for raindrop energy harvesting.
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