Controlling the nanostructures and elemental compositions of the nanocatalysts has been recognized as two prominent means to kinetically promote the (electro)catalytic performance. In this presentation, I summarized recent achievements in our group on surfactant-directed nanosynthesis strategies for nanostructured Pd-based alloyed nanocrystals in various electrocatalytic applications. By the utilization of amphiphilic dioctadecyldimethylammonium chloride (DODAC) which is composed of with two hydrophobic tails and one hydrophilic quaternary head as the surfactant template, various alloyed Pd-based nanostructures were controllably obtained in different synthetic conditions. For example, in the higher reaction temperature (&gt; 95 <sup>o</sup>C), obtained PdM were structurally ultrathin and single-crystalline, and compositionally tailorable (M = Pt, Ag, Cu, et. al.). By contrast, the lower temperature resulted in the formation of mesoporous nanospheres (MNSs), especially in the presence of ethanol (as the co-solvent). Our method has successfully grown size-tunable multimetallic MNSs, core-shell MNSs, and even (asymmetric) hollow MNSs. Due to synergic advantages on nanostructures and elemental compositions, the resultant materials exhibited remarkably enhanced electrocatalytic performance in both ethanol oxidation reaction and hydrogen evolution reaction. We believe our synthetic strategy will open a new avenue to rationally design multimetallic nonstructural nanocatalysts with controlled functions for a broad range of applications.

Effect of surfactant on nanosynthesis of noble metal nanocrystals: Case of dioctadecyldimethylammonium chloride (DODAC)

2019 Fall National Meeting

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