The active site density, intrinsic activity, and durability of palladium-based materials used in oxygen reduction reactions (ORRs) are critical for their applications in industrial energy equipment. Based on this,Professor Ma Jun and Professor Peng Shengjie (co-corresponding author) of Nanjing University of Aeronautics and AstronauticsAn environmentally controllable radiometric reduction synthesis of a series of nanoparticles (m@mno2-x,m=ru, pt, pd, ir) anchored on defect-rich manganese oxides for glycerol-assisted hydrogen evolution is reported.
Due to the strong penetration of the rays, a strong interfacial coordination between the metal nanoparticles and the defect-rich manganese dioxide is achieved, which significantly accelerates the electron transfer between the active centers. Among them, the interfacial Ru-O-Mn bond in the ru@mno2-X catalyst activates both the Ru and Mn sites, resulting in excellent bifunctional catalytic performance for glycerol oxidation (GOR) and hydrogen evolution (HER). The ru@mno2-x electrode, which is used as the cathode and anode in a continuous flow electrolyzer, has a cell voltage of 10Current density of 5 A cm-2.
In-situ spectroscopy analysis showed that the strong interfacial coordination in ru@mno2-X balanced the competitive adsorption of glycerol and OH* on the catalyst surface. Theoretical calculations further show that the defect-rich MnO2 carrier promotes the dissociation of H2O, while the defect-regulated RU site promotes deprotonation and hydrogen desorption, synergistically enhancing glycerol-assisted hydrogen evolution. This study highlights promising approaches for the synthesis of advanced support materials to achieve efficient glycerol-assisted hydrogen evolution.
ambient γ-rays-mediated noble-metal deposition on defect-rich manganese oxide for glycerol-assisted h2 evolution at industrial-level current density. angew. chem. int. ed.,, doi: 10.1002/anie.202314569.