Self‐Powered Integrated Sensing System with In‐Plane Micro‐Supercapacitors for Wearable Electronics

Abstract Self‐powered integrated sensor with high‐sensitivity physiological signals detection is indispensable for next‐generation wearable electronic devices. Herein, a Ti 3 C 2 T x /CNTs‐based self‐powered resistive sensor with solar cells and in‐plane micro‐supercapacitors (MSCs) is successfully realized on a flexible styrene–ethylene/butylene–styrene (SEBS) electrospinning film. The prepared Ti 3 C 2 T x /CNTs@SEBS/CNTs nanofiber membranes exhibit high electrical conductivity and mechanical flexibility. The laser‐assisted fabricated Ti 3 C 2 T x /CNTs based‐MSCs demonstrate a high areal energy density of 52.89 and 9.56 µWh cm −2 with a corresponding areal power density of 0.2 and 4 mW cm −2 . Additionally, the MSCs exhibit remarkable capacity retention of 90.62% after 10 000 cycles. Furthermore, the Ti 3 C 2 T x /CNTs based‐sensor exhibits real‐time detection capability for human facial micro‐expressions and pulse single under physiological conditions. The repeated bending/release tests indicate the long‐time cycle stability of the Ti 3 C 2 T x /CNTs based‐sensor. Owing to the excellent sensing performance, the sensing array was also fabricated. It is believed that this work develops a route for designing a self‐powered sensor system with flexible production, high performance, and human‐friendly characteristics for wearable electronics.