Yin Sijie, Liu Xiaohan, Kaji Tatsuya, Nishina Yuta, Miyake Takeo
Graduate School of Information, Production and Systems, Waseda University, 2-7 Hibikino, Wakamatsu, Kitakyushu, Fukuoka, 808-0135, Japan.
Graduate School of Natural Science and Technology, Okayama University, Tsushimanaka, Kita-ku, Okayama, 700-8530, Japan.
Biosens Bioelectron. 2021 May 1;179:113107. doi: 10.1016/j.bios.2021.113107. Epub 2021 Feb 20.
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.
利用汗液发电的可穿戴设备在皮肤电子学领域备受关注。这些设备需要在小体积和生物体低汗液分泌率的情况下具备高性能。在此，我们展示了一种基于人汗液中乳酸的高功率生物燃料电池手环。该生物燃料电池通过使用用于乳酸氧化的乳酸氧化酶/锇基媒介体/碳纳米管纤维以及用于氧还原的胆红素氧化酶/碳纳米管纤维来开发；这些纤维被编织成用于汗液储存的亲水性支撑织物。储存织物夹在用于从皮肤吸收汗液的疏水性织物和亲水性织物之间，亲水性织物用于水分蒸发以改善汗液收集。分层电池在20 mM人工汗液乳酸中于0.39 V时的性能为74 μW，其性能在12小时内保持在80%以上。此外，我们通过将阳极/阴极纤维捆绑起来以在手腕上缠绕手环型生物燃料电池，展示了阳极/阴极纤维之间的串联连接。增强型六电池手环在2.0 V时发电，足以运行数字手表。
