A Seamlessly Integrated Device of Wireless Energy Storage and Humidity Sensing for Human‐Machine Interaction of Respiration

Since respiration responds to many health conditions, it is essential to monitor respiratory signals by constant humidity changes. Herein, a strategy for continuous, wireless, non-invasive respiration monitoring is proposed by using a wireless energy storage and humidity sensing integrated device (WES-HSID), which includes a wireless charging coil (WCC), micro-supercapacitors (MSCs) and a humidity sensor. All electrodes of functional units are prepared by all-in-one material, which exhibits high conductivity (3 Ω cm^-2 for WCC and humidity sensor electrodes) and excellent capacitive performance (212.4 mF cm^-2 for MSCs). Besides, all functional units are connected by shared electrodes without additional wires by all-in-one structure. It is demonstrated that the resistance for the humidity sensor varied from 484.60 kΩ at 11% relative humidity (RH) to 2.62 kΩ at 100% RH. After wireless charging for 6 min, the WES-HSID can reach a voltage of 3 V, with an operating time over 60 min. Furthermore, the WES-HSID can be employed in a human-machine interaction system for respiration monitoring. This work provides a new strategy for human-machine interaction based on all-in-one non-contact wireless energy storage sensing system.