Journal
JOURNAL OF POWER SOURCES
Volume 546, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2022.231945
Keywords
Biobattery; Skin patch; Transdermal current; Air-breathing cathode; Three-phase boundary
Funding
- Tohoku University Frontier Research program (FrRiD)
- Ministry of Education, Culture, Sports, Science and Technology, Japan [20K21877]
- [22H04956]
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A water-proof anti-drying enzymatic O-2 cathode for a deformable bioelectric skin patch was developed, which combined a thin PDMS membrane with a BOD-modified CF electrode to create a microspace serving as an oxygen reservoir. Even in a soaked condition, the patch could still function properly due to the excellent oxygen-permeability of the PDMS membrane. The patch performance could be recovered within seconds when the oxygen in the reservoir was depleted by soaking.
A water-proof anti-drying enzymatic O-2 cathode for a deformable bioelectric skin patch was developed by laminating a thin membrane (50 mu m thick) of polydimethylsiloxane (PDMS) to a bilirubin oxidase (BOD)-modified carbon fabric (CF) electrode. The PDMS membrane and the CF electrode were adhered so that a microspace serving as the oxygen reservoir was formed at their interface, enabling the operation of the patch even in a soaked condition for more than a few minutes. Even if the oxygen in the reservoir was depleted by soaking for too long, the patch performance could be recovered within a few tens of seconds by taking it out of the water, owing to the excellent oxygen-permeability of the thin PDMS membrane. The anti-drying effect of PDMS prolonged the lifetime of the bioelectric patch wrapped around a finger for more than 3 h while maintaining transdermal current of similar to 20 mu A cm(-2).
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