8. stretchable biofuel cells as wearable textile-based self-powered sensors
Name: Itthipon Jeerapan
Grad Year: 2019
Advanced soft materials for sensors and electronic devices are attractive and used as wearable devices for diverse fitness and biomedical applications. Irrespective of applications, almost all wearable devices require viable energy sources. Therefore, in this work, stretchable textile-based biofuel cells (BFCs) acting as effective self-powered sensors have been fabricated using screen-printing of customized stress-enduring inks. Nanocomposite materials were carefully engineered to enhance the electrical, electrochemical, and mechanical properties. Due to the synergistic effects of nanomaterial-based inks and the serpentine designs, these printed bioelectronic devices endured severe mechanical deformations, e.g., stretching, indentation, or torsional twisting, reflecting daily activities. Glucose and lactate BFCs with single-enzyme and membrane-free configurations generated the maximum power densities of 160 and 250 μW cm−2 with the open-circuit voltages of 0.44 and 0.46 V, respectively. The textile-BFCs were able to withstand repeated severe mechanical deformations with minimal impact on its structural integrity, as was indicated from their stable power output after 100 cycles of 100% stretching. By providing power signals proportional to the sweat fuel concentration, these stretchable devices act as highly selective and stable self-powered textile sensors. Their applicability to sock-based BFCs and self-powered biosensors and mechanically compliant operations was demonstrated on human subjects. These stretchable skin-worn ?scavenge-sense-display? devices are expected to contribute to develop skin-worn energy harvesting systems, advanced non-invasive self-powered sensors, and wearable electronics.
Industry Application Area(s)
Electronics/Photonics | Energy/Clean technology | Life Sciences/Medical Devices & Instruments