Abstract: The electrocatalytic oxidation of propylene to 1,2-propylene glycol (PG) holds promise as a sustainable green chemistry approach. However, conventional palladium (Pd)-based catalysts are susceptible to CO poisoning and exhibit limited activity, impeding their widespread application. To address the aforementioned challenges, an alloying strategy was employed in this study to design and synthesize a bimetallic oxide PdPbOx catalyst. A series of PdPbOx catalysts with varied Pd/Pb ratios were prepared through a chemical co-reduction method followed by high-temperature annealing. These catalysts were then evaluated for the electrocatalytic propylene oxidation reaction. Electrochemical measurements results revealed that the Pd0.256Pb0.045Ox catalyst demonstrated superior electrocatalytic activity, achieving a PG production rate of 90.78 mmol/(m2·?h) at 2.6 V vs. RHE. The significant performance enhancement compared to the PdO catalyst is attributed to the multi-element synergistic effect exhibited by the bimetallic system. This effect effectively modulates the active site distribution and optimizes the electronic structure of the catalyst, providing new insights and directions for the design of highly efficient electrocatalytic propylene oxidation catalysts.

Key words: Bimetallic oxide, Alloying, Synergism, Electrocatalysis, Propylene oxidation