钯铋金属烯的制备及氧还原性能研究

Ultrathin two-dimensional palladium (Pd) metallene with graphene-like morphology,owing to its abundant coordinatively unsaturated atoms and high electron transport capability, has been widely applied in the electrocatalytic oxygen reduction reaction (ORR). To further enhance its ORR performance, alloying is a simple and effective strategy. In this paper, ultrathin two-dimensional Pd metallene was synthesized by reducing palladium acetylacetonate with tungsten hexacarbonyl, and non-precious metal bismuth (Bi) atoms were introduced through lattice doping to prepare PdBi metallene. The ultrathin two-dimensional morphology exposes abundant active sites, and combined with the ligand effect and strain effect brought by alloying, it exhibits enhanced ORR performance. Due to the abundant active sites exposed by its ultrathin two-dimensional structure, as well as the ligand and strain effects induced by alloying, the mass activity and specific activity of this PdBi metallene are 12.2 and 2.5 times that of commercial Pd/C, respectively, demonstrating significantly enhanced ORR performance. After 10,000 cycles of long-term potential cycling, its mass activity only decreased by 16.39%, exhibiting high cycling stability This work provides a reference for the design and preparation of high-performance Pd-based ORR electrocatalysts.