Degradable, Skin‐Conformal Nanocomposite‐Based Bioelectronic Patches for High‐Fidelity Electrophysiology and Gesture‐Controlled Robotics

Skin‐interfaced electronics demand sustainable form factors, yet high‐performance wearables continue to rely on non‐degradable substrates, synthetic adhesives, and filler‐heavy conductive networks incompatible with responsible single‐use deployment. We report a water‐processable, degradable electronic skin patch that reconciles high‐fidelity biopotential recording with high‐performance kinematic sensing. The skin‐matched gelatin substrate enables ultra‐conformal, adhesive‐free epidermal lamination via a single water droplet, eliminating the need for coupling gels or surface pretreatment. The starch‐dominated conductive ink, comprising up to 99.05 vol% starch, achieves robust electrical percolation (11.3 S/m) at exceptionally low Ti 3 C 2 T x MXene loadings (0.95–4.37 vol%), demonstrating that bioelectronic‐grade conductivity does not require high filler fractions. The resulting e‐skin exhibits excellent electromechanical reliability detecting strains as low as 0.25% over 10 000 cycles, supports machine‐learning‐assisted gesture recognition (∼96% accuracy) for wireless robotic control, and simultaneously acquires high‐fidelity electrocardiogram, electromyogram, and electrooculogram signals matching the performance of clinical Ag/AgCl gel electrodes. Upon disposal, the device degrades rapidly in both soil and aqueous media. This work establishes that globally abundant biopolymers can function as dominant active materials in multimodal, high‐fidelity bioelectronics, creating a scalable path toward zero e‐waste wearable platforms.