Fiber-crafted biofuel cell bracelet for wearable electronics.

Sijie Yin, Xiaohan Liu, Tatsuya Kaji, Yuta Nishina, Takeo Miyake

Biosensors & bioelectronics 2021 May 01

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Wearable devices that generate power using sweat have garnered much attention in the field of skin electronics. These devices require high performance with a small volume and low production rate of sweat by living organisms. Here we demonstrate a high-power biofuel cell bracelet based on the lactate in human sweat. The biofuel cell was developed by using a lactate oxidase/osmium-based mediator/carbon nanotube fiber for lactate oxidation and a bilirubin oxidase/carbon nanotube fiber for oxygen reduction; the fibers were woven into a hydrophilic supportive textile for sweat storage. The storage textile was sandwiched between a hydrophobic textile for sweat absorption from the skin and a hydrophilic textile for water evaporation to improve sweat collection. The performance of the layered cell was 74 μW at 0.39 V in 20 mM artificial sweat lactate, and its performance was maintained at over 80% for 12 h. Furthermore, we demonstrated a series-connection between anode/cathode fibers by tying them up to wrap the bracelet-type biofuel cell on the wrist. The booster six-cell bracelet generated power at 2.0 V that is sufficient for operating digital wrist watches. Copyright © 2021 Elsevier B.V. All rights reserved.

Citation

Sijie Yin, Xiaohan Liu, Tatsuya Kaji, Yuta Nishina, Takeo Miyake. Fiber-crafted biofuel cell bracelet for wearable electronics. Biosensors & bioelectronics. 2021 May 01;179:113107