1 research outputs found
Stretchable Fiber Biofuel Cell by Rewrapping Multiwalled Carbon Nanotube Sheets
The
fiber-type biofuel cell is attractive as an implantable energy
source because the fiber can modify various structures and the wound
can be stitched like a suture. In addition, in daily life, the biofuel
cell is forced by human motion, and stretchability is a critical requirement
for real applications. Therefore, we introduce a new type of highly
stretchable, stable, soft fiber biofuel cell with microdiameter dimensions
as an energy harvester. The completed biofuel cell operated well in
fluids similar to human fluids, such as 20 mM phosphate-buffered 0.14
M NaCl solution (39.5 mW/cm<sup>2</sup>) and human serum (36.6 μW/cm<sup>2</sup>). The fiber-type biofuel cell can be reversibly stretched
up to 100% in tensile direction while producing sustainable electrical
power. In addition, the unique rewrapping structure, which traps the
enzyme between multiwalled carbon nanotube sheets, enormously enhanced
the stability of the biofuel cell when the biofuel cell was repeatedly
stretched (the power density retention increased from 63 to 99%) and
operated in human serum (the power density retention increased from
29 to 86%). The fiber can be easily woven into various structures,
such as McKibben braid yarn, and scaled up by series and parallel
connections