Biofuel-powered soft electronic skin with multiplexed and wireless sensing for human-machine interfaces.

Area of Science:

• Materials Science
• Biomedical Engineering
• Wearable Technology

Background:

• Current electronic skin (e-skin) platforms rely on external power sources like batteries or near-field communication, limiting their application in next-generation robotics and medical devices.
• Self-powered e-skins capable of wireless biosensing and communication are scarce due to challenges in continuous energy harvesting and power efficiency.

Purpose of the Study:

• To develop a flexible, fully perspiration-powered integrated electronic skin (PPES) for in situ multiplexed metabolic sensing.
• To enable self-powered, wireless data transmission for advanced human-machine interfaces.

Main Methods:

• Integration of multimodal sensors with highly efficient lactate biofuel cells utilizing a novel combination of zero- to three-dimensional nanomaterials.
• Utilizing untreated human sweat as a continuous energy source for the biofuel cells.
• Wireless data transmission via Bluetooth to a user interface.

Main Results:

• Achieved a record-breaking power density of 3.5 mW/cm² for biofuel cells using human sweat.
• Demonstrated stable performance over 60 hours of continuous operation.
• Successfully monitored key metabolic analytes (urea, NH₄⁺, glucose, pH), skin temperature, and muscle contraction.
• Enabled wireless data transmission and served as a human-machine interface for prosthesis control.

Conclusions:

• The developed PPES offers a viable solution for self-powered, wireless biosensing in wearable electronics.
• This technology has significant potential for applications in advanced robotics, personalized medicine, and human-machine interfaces.