Structural modulation of noble metal nanostructures at the atomic scale can greatly alter their catalytic properties. For instance, decorating the surface of single-crystal metal substrates with other single- or few-layer metal atoms may induce the lattice strain, which plays a decisive role in determining the surface reactivity. In view of the unique properties of ultrathin nanosheets (NSS) and atomic layer of metals, it is highly desirable to develop a facile, versatile, and robust method to prepare ultrathin bimetallic core-shell NSs. However, the complete coverage of one atomically layered shell may block the catalytically active sites of the core. In contrast, the exposure of different metal atoms in bimetallic core-shell nanostructures is an effective strategy to enhance their catalytic activities. In this presentation, we report a simple wet-chemical approach to synthesize the ultrathin Pd NSs decorated with submonolayered Ru, referred to as Pd@Ru NSs, by a seed-mediated growth method. The underpotential deposition process is responsible for the formation of Pd@Ru NSs. The as-synthesized novel bimetallic Pd@Ru NSs exhibit excellent catalytic properties toward the reduction of 4-nitrophenol and the semihydrogenation of 1-octyne as compared to the pure Pd NSs and Ru NSs.

Submonolayered Ru deposited on ultrathin Pd nanosheets used for enhanced catalytic applications

256th National Meeting (2018)

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