A Stretchable Solid Ionic Electrode‐Based Triboelectric Nanogenerator for Biomechanical Energy Harvesting and Self‐Powered Sensors
Xiangkun Bo, Lingyun Wang, Hong Zhao, Jasim M. Almardi, Weilu Li, Walid A. Daoud
Abstract
Abstract Stretchable power devices and self‐powered sensors have become increasingly desired for wearable electronics and artificial intelligence. In this study, an all‐solid‐state triboelectric nanogenerator (TENG) is reported, whose one solid‐state structure prevents delamination during stretch and release cycles and increasing the patch adhesive force (3.5 N) and strain (586% elongation at break). Through the synergetic virtues of stretchability, ionic conductivity, and excellent adhesion to the tribo‐layer, reproducible open‐circuit voltage ( V OC ) of 84 V, charge ( Q SC ) of 27.5 nC, and short‐circuit current ( I SC ) of 3.1 µA after drying at 60°C or 20,000 contact‐separation cycles are obtained. Apart from contact‐separation, this device shows unprecedented electricity generation through stretch–release of solid materials leading to a linear relationship between V OC and strain. For the first time, this work provides a clear explanation of the working mechanism of contact‐free stretching–releasing and investigates the relationships of exerted force, strain, thickness of the device, and electric output. Benefitting from the one solid‐state structure, this contact‐free device remains stable even after repeated stretch–release cycling, maintaining 100% of its V OC after 2500 stretch–release cycles. These findings provide a strategy toward highly conductive and stretchable electrodes for harvesting mechanical energy and health monitoring.