This work presents a self-powered chemoelectric humidity sensor based on the metal-air redox reaction. A silk fibroin (SF) and LiBr gel matrix containing aligned graphene oxide (GO) flakes serves as the electrolyte. The sensor exhibits high sensitivity (0.09 µA/s/1%), fast response (1.05 s), and quick recovery (0.80 s). Proof-of-concept applications include a respiratory monitoring system and a non-contact human-machine interface, highlighting its potential in health management.
