SnO<sub>2</sub>@PdAg\nCore–Shell Nanoarchitecture\nPromotes Active and Stable Alcohol Electrooxidations

Developing efficient Pd-based electrocatalysts is of\nvital importance\nfor the application of direct alcohol fuel cells. Designing the core–shell\narchitecture of Pd-based nanomaterials rationally has emerged as an\neffective strategy to promote the sluggish kinetics of anodic reactions.\nHerein, the PdAg alloy is reduced on a non-noble metal oxide surface\nfor the formation of a core–shell nanostructure. The optimized\nSnO<sub>2</sub>@PdAg<sub>h</sub> nanospheres deliver the optimal catalytic\nperformance compared with other counterparts and commercial Pd/C.\nThe structural investigation reveals that the introduction of Ag and\nformation of a PdAg/SnO<sub>2</sub> heterointerface effectively regulate\nthe electronic structure of Pd, making SnO<sub>2</sub>@PdAg<sub>h</sub> a highly active catalyst for methanol and ethylene glycol oxidation\nreactions. Impressively, the strong interaction between the PdAg shell\nand SnO<sub>2</sub> core stabilizes the metal-oxide heterointerface,\ncontributing to the improved stability of SnO<sub>2</sub>@PdAg<sub>h</sub> in electrocatalytic reactions. This study proposes the use\nof non-noble metal oxides as the core to suppress the dissolution\nof the catalysts and highlights the rational design of core@shell\nnanoarchitectures.