Green starch-based self-decomposable hydrogels integrating flexible supercapacitors and intelligent human activity state monitoring

Abstract

Hydrogels are widely used in flexible energy storage and human state detection. As environmental protection requirements continue to increase, the degradability of hydrogels needs to be further improved. In this study, by introducing green starch into acrylamide (AM) and tannic acid (TA), the synergistic improvement of degradability, flexible energy storage and intelligent human motion state detection is achieved. These hydrogels were then assembled into supercapacitors, which achieved a capacitance of 340.4 F g−1 at a current density of 0.8 mA cm−2, with a capacitance retention rate of 83.5 % after 3000 cycles. As flexible sensing devices, the hydrogels exhibited a response time of 0.16 s and provided consistent real-time resistance change rates in response to various strains, yielding a gauge factor of 3.77. Thus, this starch based hydrogls (SAT) demonstrated promising applications as both Morse code encoders and intelligent manipulator based on deep learning, which cast lights on multifunctional flexible devices.