“…The electrocatalytic activity of the catalyst is significantly correlated with its morphology. − Metallene, a class of thin-layered two-dimensional (2D) materials with a thickness of several atomic layers, has garnered significant interest in electrocatalysis fields on account of its large-surface area and sufficient catalytic active sites. − The synthesis of PdMo bimetallene with highly curved and ultrathin structures has been reported, which exhibited excellent ORR performance in alkaline electrolytes . In addition to morphology control, another approach to enhance catalytic activity is interface engineering by polymer functionalization. − For example, Pt nanospines functionalized with polyallylamine (PAA) were synthesized, which effectively improved the ORR activity, selectivity, and durability because the loose PAA layer on the surface can effectively change the electronic structure of Pt atoms .…”