Hybrid electrodes containing MoS₂ with metals active for the hydrogen evolution reaction (HER) are highly desirable as they can provide a cost‐effective and active route for producing hydrogen. It is well known that the technique used to facilitate such hybrid formation plays a critical role in the activity and stability of the electrode. Here we utilized a novel method for hybridization based on electron‐beam deposition of Ag, Pd, and Mo to make precursor films which, upon sulfurization, formed hybrid electrodes based on vertically aligned molybdenum disulfide (VA‐MoS₂). We further modified the surface of these electrodes by exploiting galvanic replacement of palladium. Surprisingly, both hybridization techniques showed a synergistic effect between Pd and Ag, and enhanced activity was enabled by the presence of both metals. XPS, XRD, Raman spectroscopy, and FIB‐EM were used to explore the root cause of the synergy. It appears that enhanced performance is based partially on the mutual solubility of Pd−Ag and the facile diffusion of Ag through the MoS₂ film. Ag/VA‐MoS₂ modified by galvanic replacement provided 10 mA/cm² at 210 mV of overpotential and was stable for up to 4000 cycles, surpassing the stability of previously reported Pd/MoS₂ hybrids, making these techniques of interest for future generations of hybrid HER electrodes based on MoS₂.

中文翻译：

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银和钯的协同添加促进垂直配向的MoS2上的催化氢释放反应

含有MoS ₂和对氢释放反应具有活性的金属的混合电极是非常理想的，因为它们可以为生产氢提供经济有效的途径。众所周知，用于促进这种杂化形成的技术在电极的活性和稳定性中起关键作用。在这里，我们利用一种基于Ag，Pd和Mo的电子束沉积的新型杂交方法来制备前驱膜，该前驱膜经硫化形成基于垂直排列的二硫化钼（VA-MoS ₂）。我们通过电镀取代钯进一步修饰了这些电极的表面。出人意料的是，两种杂交技术都显示出Pd和Ag之间的协同效应，并且两种金属的存在都增强了活性。XPS，XRD，拉曼光谱和FIB-EM用于探索协同作用的根本原因。似乎增强的性能部分基于Pd-Ag的互溶性以及Ag通过MoS ₂膜的容易扩散。通过电置换改性的Ag / VA-MoS ₂在210 mV的超电势下提供10 mA / cm ^2的稳定性，最多可稳定4000个循环，超过了先前报道的Pd / MoS ₂的稳定性混合材料，使这些技术成为基于MoS _2的下一代混合HER电极的关注点。