The activity and accessibility of MoS2 edge sites are critical to deliver high hydrogen evolution reaction (HER) efficiency. Here, a porous carbon network confining ultrasmall N-doped MoS2 nanocrystals (N-MoS2/CN) is fabricated by a self-templating strategy, which realizes synergistically structural and electronic modulations of MoS2 edges. Experiments and density functional theory calculations demonstrate that the N dopants could activate MoS2 edges for HER, while the porous carbon network could deliver high accessibility of the active sites from N-MoS2 nanocrystals. Consequently, N-MoS2/CN possesses superior HER activity with an overpotential of 114 mV at 10 mA cm-2 and excellent stability over 10 h, delivering one of best MoS2-based HER electrocatalysts. Moreover, this study opens a new venue for optimizing materials with enhanced accessible catalytic sites for energy-related applications.

中文翻译：

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用于析氢的 MoS2 边缘的结构和电子优化

MoS2 边缘位点的活性和可及性对于提供高析氢反应 (HER) 效率至关重要。在这里，通过自模板策略制造了限制超小 N 掺杂 MoS2 纳米晶体 (N-MoS2/CN) 的多孔碳网络，实现了 MoS2 边缘的协同结构和电子调制。实验和密度泛函理论计算表明，N 掺杂剂可以激活 HER 的 MoS2 边缘，而多孔碳网络可以使 N-MoS2 纳米晶体的活性位点具有高可及性。因此，N-MoS2/CN 具有优异的 HER 活性，在 10 mA cm-2 下的过电位为 114 mV，并且在 10 小时内具有出色的稳定性，是最好的基于 MoS2 的 HER 电催化剂之一。而且，