Unveiling The Multifunction of Beaded Stream‐Like Co9Se8 Catalysts for Water Splitting, Reactive Oxygen Species Scavenging, and Hydrogen Anti‐Inflammation

Abstract The electrocatalytic preparation of hydrogen at different pH values not only achieves excellent device performance but also promotes the application of reactive oxygen species (ROS) clearance and hydrogen anti‐inflammation. However, it is difficult to develop materials that simultaneously achieve these excellent properties. Herein, the preparation of beaded necklace‐like Co 9 Se 8 microspheres using a general and facile synthetic strategy is reported. The Co 9 Se 8 ‐modified electrode has three applications: efficient water splitting for enhanced performance, ROS scavenging, and hydrogen anti‐inflammatory activity. Experiments, high‐angle‐annular‐dark‐field scanning transmission electron microscopy, and density functional theory calculations indicate that the reconstructed Co(OH) 2 plays a vital role in the oxygen evolution reaction and that the transition from *O to *OOH is the actual rate‐determining step. The Co 9 Se 8 material, with its unique beaded necklace‐like structure, exhibits exceptional hydrogen production capabilities in phosphate buffer solution (pH 7.4). In particular, hydrogen produce under neutral conditions can effectively reduce ROS levels and significantly inhibit inflammation‐related pathological processes, playing a unique antioxidant and anti‐inflammatory role at the cellular level. The obtained results indicate that the as‐synthesized Co 9 Se 8 is more suitable for water splitting, ROS scavenging, and hydrogen anti‐inflammatory applications, outperforming other transition metal electrodes and rendering practical industrial and clinical applications.