Magnetic Oxygen-Generating Robots via a Self-Healing Hydrogel-Based Modular Assembly Strategy

• • Achieved photocatalytic oxygen evolution rate of 389.1 μmol g−1 h−1 using Ru-Bi2CrO6 embedded in self-healing hydrogel, enabling targeted aquatic oxygenation with minimal water disturbance. • • Modular assembly of magnetic actuation and functional modules allows complex geometries and magnetization distributions, enabling diverse deformations under magnetic fields for versatile soft robotic motions. • • Hydrogel skeleton effectively suppresses photocatalytic particle aggregation and sedimentation, ensuring stable performance and enabling facile magnetic recovery for reuse. • • Self-healing κ-carrageenan/polyacrylamide hydrogel provides mechanical robustness and chemical stability, supporting repeated actuation and functional integration in underwater environments.