Journal
BIOSENSORS & BIOELECTRONICS
Volume 179, Issue -, Pages -Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2021.113107
Keywords
Biofuel cell; Wearable devices; Enzyme electrode; Sweat; Ionic gel
Categories
Funding
- JST, PRESTO [JPMJPR20B8]
- AMED [JP20he0422009j0001]
- TEPCO Memorial Foundation
- Nanotechnology Platform Program of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
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This study demonstrates a high-power biofuel cell bracelet based on lactate in human sweat, with stable performance suitable for devices like digital watches. By optimizing sweat collection and utilization techniques, the efficiency and stability of biofuel cells have been improved.
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 or-ganisms. 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 ?W 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.
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