Two-dimensional layered molybdenum sulfide (MoS₂) is highly attractive as electrocatalyst for high purity hydrogen production because of its intrinsic properties and favorable cost-benefit ratio. Notably, electrocatalytic activity of MoS₂ strongly depends on exposed edges and density of defect sites. Here, we report the preparation of MoS₂ nanoflakes through an oxalic acid assisted-hydrothermal method. A comparatively excessive amount of oxalic acid was used as an alternative strategy for the preparation of MoS₂. XRD, TEM, RAMAN, and XPS results revealed that as-prepared MoS₂ is highly defective with presence of unsaturated S and abundant exposed edges. As a result, structurally defective MoS₂ nanoflakes exhibit high activity for HER with low overpotential of 214 mV at 10 mA/cm², a small Tafel slope of 52 mV/decade and excellent stability.

二维层状硫化钼（MoS ₂）由于具有内在特性和良好的成本效益比，因此作为生产高纯度氢气的电催化剂极具吸引力。值得注意的是，MoS _2的电催化活性在很大程度上取决于裸露的边缘和缺陷部位的密度。在这里，我们报告通过草酸辅助水热法制备MoS ₂纳米薄片。使用相对过量的草酸作为制备MoS ₂的替代策略。XRD，TEM，RAMAN和XPS结果表明，制备的MoS ₂具有高度的缺陷，存在不饱和S和大量暴露的边缘。结果，结构上有缺陷的MoS ₂纳米薄片对HER具有高活性，在10 mA / cm ²时具有214 mV的低过电势，52 mV /十倍的小Tafel斜率和出色的稳定性。