Wearable Solar Ionic Thermoelectric Detectors for Human Motion Monitoring and Language Recognition Conversion

Abstract

Flexible self-powered sensors with the significant ability to the information perception, decoding, and conveying processes have attracted tremendous attention in healthcare monitoring, motion detection, and intelligent interaction. Also, the solar thermoelectric technology holding the effective solar energy/heat harvesting capacity for sustainable electricity generation shows attractive prospects in self-powered wearable sensing but is terribly limited by its poor flexibility and complex construction. Herein, a solar thermoelectric system, prepared via facilely sandwiching the self-assemble MoS₂/Carbon hollow nanoflower-based fabrics with [Fe(CN)₆]^3-/4− thermoelectric gels, is successfully applied for the self-powered wearable sensing. Owing to the hollow-heterostructure for the strong light absorption, MoS₂/Carbon hollow nanoflower-based fabrics demonstrated a photothermal conversion efficiency of 39.6%. The strong heat concentration can supply a considered temperature gradient of 42.7 K for thermoelectric gels with a Seebeck coefficient of 1.08 mV K⁻¹ under a solar intensity of 1 sun, outputting a voltage density of 101.2 V m⁻² with a response of 431 ms. Their promising application in self-powered wearable fields, such as noncontact motion monitoring and language interaction is foreseen.