Recently, asymmetrically functionalized two‐dimensional (2D) nanomaterials have attracted fevered interest as excellent candidates for building blocks of multifunctional and multidimensional systems due to the structural symmetry‐breaking. However, their preparation process typically involves high vacuum environment or specific equipment, and the obtained samples have poor stability and low yield. In this study, a facile approach has been developed to achieve the asymmetric deposition of platinum nanoparticles (NPs) onto single side of the molybdenum disulfide (MoS₂) nanosheets by pyrogenic decomposition and in‐situ functionalization. By tuning the platinum precursor to MoS₂ ratio, the size distribution and morphology of the Pt NPs can be well controlled. The asymmetrical decoration of Pt NPs on MoS₂ nanosheets (Pt−MoS₂) may result from the superior interactions between Pt NPs and MoS₂ basal surface, which are stronger than the van der Waals force between adjacent MoS₂ layers. Hydrogen evolution reaction (HER) results show that higher Pt loading yields better HER performance with low overpotential of 120 mV and superior Tafel slope of 28 mV ⋅ dec⁻¹. Significantly, the current synthetic method can be used in the asymmetrical functionalization of other 2D nanosheets as well, and could greatly advance the facile preparation and practical applications of these asymmetric nanostructures.

中文翻译：

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Mos2纳米片单表面修饰的Pt纳米粒子的快速，受控且容易控制的制备及其在HER中的应用

最近，由于结构对称性的破坏，不对称功能化的二维（2D）纳米材料作为多功能和多维系统构建基块的优秀候选者，引起了人们的强烈兴趣。然而，它们的制备过程通常涉及高真空环境或特定设备，并且所获得的样品稳定性差且产率低。在这项研究中，已开发出一种简便的方法，通过热解和原位官能化将铂纳米颗粒（NPs）不对称沉积到二硫化钼（MoS ₂）纳米片的单面上。通过将铂前驱物调整为MoS ₂可以很好地控制Pt NP的比率，大小分布和形态。MoS ₂纳米片上Pt NPs （Pt-MoS ₂）的不对称装饰可能是由于Pt NPs与MoS ₂基表面之间的优越相互作用所致，该相互作用强于相邻MoS ₂层之间的范德华力。氢气析出反应（HER）结果表明，较高的Pt负载可产生更好的HER性能，低过电势为120 mV，Tafel斜率更高，为28 mV⋅dec ^-1。重要的是，当前的合成方法也可以用于其他2D纳米片的不对称官能化，并且可以大大促进这些不对称纳米结构的简便制备和实际应用。