“…It is widely recognized that the electrocatalytic performance of noble metals can be enhanced by rationally designing and delicately modulating their shape and composition, which effectively optimize their atomic arrangements and electronic structures to generate a larger number of active centers. , In this aspect, the shape-controlled synthesis of different Pd nanostructures, such as Pd nanocubes, Pd nanowires, Pd nanosheets, Pd nanodendrites, and so on, have been achieved and demonstrated improvements in the catalytic ability. Among them, two-dimensional (2D) Pd metallene has become a hot spot of research due to its dramatically enhanced catalytic ability in comparison with traditional zero-dimensional (0D) Pd particles, which mainly arises from its high surface-to-volume ratio and numerous unsaturated Pd atoms. , Moreover, the utilization of Pd nanocrystals in conjunction with other non-noble transition metal elements (Fe, Co, Mo, etc.)…”