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Title: Tear-based aqueous batteries for smart contact lenses enabled by Prussian blue analogue nanocomposites
Authors: Yun, Jeonghun
Zeng, Yongpeng
Kim, Moobum
Gao, Caitian
Kim, Yeongae
Lu, Lu
Kim, Tony Tae-Hyoung
Zhao, Wenting
Bae, Tae-Hyun
Lee, Seok Woo
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2021
Source: Yun, J., Zeng, Y., Kim, M., Gao, C., Kim, Y., Lu, L., Kim, T. T., Zhao, W., Bae, T. & Lee, S. W. (2021). Tear-based aqueous batteries for smart contact lenses enabled by Prussian blue analogue nanocomposites. Nano Letters, 21(4), 1659-1665.
Project: MOE2018-T2-1-045
Journal: Nano Letters
Abstract: Batteries for contact lenses fabricated by conventional methods could cause severe damage to the eyes if broken. Herein, we present flexible aqueous batteries that operate in tears and provide a safe power supply to smart contact lenses. Nanocomposite flexible electrodes of carbon nanotubes and Prussian blue analogue nanoparticles for cathode and anode were embedded in UV-polymerized hydrogel as not only a soft contact lens but also an ion-permeable separator. The battery exhibited a discharging capacity of 155 μAh in an aqueous electrolyte of 0.15 M Na-ions and 0.02 M K-ions, equivalent to the ionic concentration of tears. The power supply was enough to operate a low-power static random-access memory. In addition, we verified the mechanical stability, biocompatibility and compatibility with a contact lens cleaning solution. It could ultimately enable a safe power supply for smart contact lenses without risk of injury due to the leakage or breakage of the battery.
ISSN: 1530-6984
DOI: 10.1021/acs.nanolett.0c04362
Schools: School of Electrical and Electronic Engineering 
School of Chemical and Biomedical Engineering 
Rights: © 2021 American Chemical Society. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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