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Title: A tear-based battery charged by biofuel for smart contact lenses
Authors: Yun, Jeonghun
Li, Zongkang
Miao, Xinwen
Li, Xiaoya
Lee, Jae Yoon
Zhao, Wenting
Lee, Seok Woo
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2023
Source: Yun, J., Li, Z., Miao, X., Li, X., Lee, J. Y., Zhao, W. & Lee, S. W. (2023). A tear-based battery charged by biofuel for smart contact lenses. Nano Energy, 110, 108344-.
Project: NRF2019-NRF-ANR052 KineHarvest 
Journal: Nano Energy 
Abstract: Smart contact lenses developed for medical and personal applications will require miniaturized power supplies, with integrated batteries providing promising options. However, charging batteries in small wearable devices is challenging because it is difficult to transfer electrical power through a miniaturized wired connection or wireless transmission unit. Herein, we develop safe, tear-based batteries integrated into contact lenses that are charged by biofuel during their storage. Enzymatic reactions of glucose oxidase and self-reduction of conducting polymer are utilized to charge the cathode and anode, respectively. The electrodes are embedded into a contact lens and discharged in an artificial tear solution followed by charging in a glucose solution via a bio-reaction (called bio-charging). The bio-charging battery shows a discharging capacity of 45 μA cm−2 and a maximum power of 201 μW cm−2, with its performance verified over 15 cycles. The bio-chargeable battery can also be charged conventionally by an external power supply.
ISSN: 2211-2855
DOI: 10.1016/j.nanoen.2023.108344
Schools: School of Electrical and Electronic Engineering 
School of Chemistry, Chemical Engineering and Biotechnology 
Research Centres: Rolls-Royce@NTU Corporate Lab 
Rights: © 2023 Elsevier Ltd.. All rights reserved. This paper was published in Nano Energy and is made available with permission of Elsevier Ltd.
Fulltext Permission: embargo_20250608
Fulltext Availability: With Fulltext
Appears in Collections:CCEB Journal Articles
EEE Journal Articles

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