Researchers at Nanyang Technological University in Singapore (NTU Singapore) have created a flexible battery that's as thin as a human cornea. This innovative energy storage device charges itself when submerged in a saline solution and has the potential to fuel smart contact lenses in the future.
Associate Professor Lee Seok Woo, from NTU’s School of Electrical and Electronic Engineering holding up the flexible battery that is as thin as a human cornea. Credit: NTU Singaporein Singapore have created a flexible battery that’s as thin as a human cornea. This innovative energy storage device charges itself when submerged in a saline solution and has the potential to fuel smart contact lenses in the future.
The NTU-developed battery is made of biocompatible materials and does not contain wires or toxic heavy metals, such as those in lithium-ion batteries or wireless charging systems. It has a glucose-based coating that reacts with the sodium and chloride ions in the saline solution surrounding it, while the water the battery contains serves as the ‘wire’ or ‘circuitry’ for electricity to be generated.
Associate Professor Lee Seok Woo, from NTU’s School of Electrical and Electronic Engineering , who led the study, said: “This research began with a simple question: Could contact lens batteries be recharged with our tears? There were similar examples of self-charging batteries, such as those for wearable technology that are powered by human perspiration.
Highlighting the significance of the work done by the research team, NTU School of Mechanical & Aerospace Engineering Associate Professor Murukeshan Vadakke Matham, who specializes in biomedical andoptics and was not involved in the study, said: “As this battery is based on glucose oxidase, which occurs naturally in humans and powered by chloride and sodium ions, such as those in our tears, they should be compatible and suitable for human usage.
The team demonstrated that the battery could produce a current of 45 microamperes and a maximum power of 201 microwatts, which would be sufficient to power a smart contact lens.
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