Abstract Molybdenum disulfide (MoS2) is reckoned as one of the most positive low-cost HER catalysts to replace platinum-based precious metals in acid media. Unfortunately, some issues preclude MoS2 from being truly applicable including limited active sites, poor conductivity and lack of intrinsic activity. Herein, we report a Cu, Pd co-doped MoS2 nanomaterial as an efficient and stable HER electrocatalysts, which partially resolve the above-mentioned problems and leads to high overall performance. Specifically, we improve the electric conductivity of the MoS2 by Cu dopant and realize the phase transition of MoS2 from pristine 2H phase to stable 1T phase by Pd dopant. More importantly, we increase active site density to facilitate fast electrocatalytic Faradaic process via synergistic effects of Cu and Pd doping, and tune electronic energy states of MoS2 to improve HER intrinsic activity. In acidic media, the performance of Cu-Pd-MoS2 catalyst in terms of a low overpotential (−93 mV) at 10 mA cm−2, a small Tafel slope of 77 mV dec−1, and an excellent stability is better than that of single-doped catalysts.

中文翻译：

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MoS2 通过双金属掺杂策略协同工程实现析氢反应

摘要 二硫化钼 (MoS2) 被认为是在酸性介质中替代铂基贵金属的最积极的低成本 HER 催化剂之一。不幸的是，一些问题阻碍了 MoS2 的真正应用，包括有限的活性位点、导电性差和缺乏内在活性。在此，我们报道了一种 Cu、Pd 共掺杂的 MoS2 纳米材料作为一种高效且稳定的 HER 电催化剂，部分解决了上述问题并带来了较高的整体性能。具体而言，我们通过 Cu 掺杂剂提高 MoS2 的电导率，并通过 Pd 掺杂剂实现 MoS2 从原始 2H 相到稳定 1T 相的相变。更重要的是，我们通过 Cu 和 Pd 掺杂的协同效应增加活性位点密度以促进快速电催化法拉第过程，并调整 MoS2 的电子能态以提高 HER 内在活性。在酸性介质中，Cu-Pd-MoS2 催化剂在 10 mA cm-2 下的低过电位 (-93 mV)、77 mV dec-1 的小塔菲尔斜率和优异的稳定性方面的性能优于单掺杂催化剂。