Tungsten disulfide (WS₂), a promising electrocatalyst made from readily available materials, demonstrates significant effectiveness in the hydrogen-evolution reaction (HER). The study conducts a thorough investigation using various analytical methods such as scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectrometry (EDS), X-ray diffraction (XRD), X-ray absorption spectroscopy (XAS), electron paramagnetic resonance (EPR), and in situ Raman spectroscopy. These techniques have uncovered changes in the WS₂ particle structure during HER. Through employing EPR, XAS, and in situ Raman spectroscopy, the research reveals structural and chemical transformations. This includes the formation of novel W species and signs of W–O bond formation. Moreover, significant changes in the morphology of the particles were observed. These findings offer enhanced insights into the mechanisms of WS₂ under HER conditions, highlighting its catalytic performance and durability.

中文翻译：

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了解析氢反应过程中二硫化钨动力学的进展：阐明该机制的第一步

二硫化钨 (WS ₂ ) 是一种很有前途的电催化剂，由容易获得的材料制成，在析氢反应 (HER) 中表现出显着的有效性。该研究使用各种分析方法进行了彻底的研究，例如扫描电子显微镜（SEM）、透射电子显微镜（TEM）、能量色散光谱（EDS）、X射线衍射（XRD）、X射线吸收光谱（XAS）、电子顺磁共振（EPR）和原位拉曼光谱。这些技术揭示了HER 期间WS ₂颗粒结构的变化。通过采用 EPR、XAS 和原位拉曼光谱，该研究揭示了结构和化学转变。这包括新的 W 物种的形成和 W-O 键形成的迹象。此外，观察到颗粒形态的显着变化。这些发现加深了对 HER 条件下 WS ₂机制的了解，突出了其催化性能和耐久性。