Raw data for Fully stretchable moisture-electric generators with peak milliamp-scale output via conformationally adaptive ionic hydrogels for wearables

However, their practical applications are hindered by insufficient moisture-responsive output and unstable performance under strain. Here, we report a fully stretchable MEG with peak milliamp-scale output for self-powered epidermal sensing, enabled by an in situ formed, conformationally adaptive hygroscopic ionic hydrogel adhesively integrated between two stretchable asymmetric-porosity styrene–ethylene–butylene–styrene (SEBS) composite electrodes.

The hydrogel encodes charge-selective pathways that drive quasi-two-dimensional, oppositely directed counter-ion migration, enabling rapid ion separation and high ionic conductivity (8.1 S m-1). Its reversible helix–coil transitions preserve ion transport under strain by dissipating strain energy across multiple scales. Coupled with SEBS composite electrodes that facilitate continuous moisture delivery and reliable electrical contact during stretching, the device achieves a peak current density of 1.1 mA cm-2 upon moisture activation, while remaining fully stretchable up to 400% strain and stable at 200% strain over 1000 cycles with minimal output degradation.