Body Heat Powered Wirelessly Wearable System for Real‐time Physiological and Biochemical Monitoring

Abstract Through harvesting energy from the environment or human body, self‐power wearable electronics have an opportunity to break through the limitations of battery supply and achieving long‐term continuous operation. Here, a wireless wearable monitoring system driven entirely by body heat is implemented. Based on the principle of maximizing heat utilization, while optimizing internal resistance and heat dissipation, the stretchable TEG improves the power density of previous similar devices from only a few microwatts per square centimeter to tens and makes it possible to continuously drive wireless wearable electronic systems. Furthermore, ceaseless self‐power energy gives wearable electronics unparalleled continuous working ability, which can realize the tracking and monitoring of biochemical and physiological indicators at different time scale. A practical system demonstrates the ability to real‐time monitor heart rate, sweat ingredient and body motion at a high sampling rate. This study marks an important advance of self‐powered wearable electronics for wirelessly real‐time healthy monitoring.