Single transition metal-based electrocatalysts typically exhibit lower HER activity compared to precious metals. However, combining multiple transition metals can elevate HER activity to levels on par with precious metals. Meanwhile, WS₂ is recognized as an effective HER electrocatalyst, with ongoing research exploring enhancements through doping and heterostructure formation. In the present study, a highly efficient HER electrocatalyst (Ag/NCZ-MF/WS₂) was developed by integrating WS₂ and Ag thin films with tri-metallic Ni-Co-Zn micro flakes (NCZ-MF). The designed electrocatalyst Ag/NCZ-MF/WS₂ exhibited excellent HER performance, achieving a current density of 10 mA/cm² at a low overpotential of 94 mV, with a Tafel slope of 56 mV/dec. Electrochemical impedance spectroscopy (EIS) revealed minimal solution and charge transfer resistances (Rs = 1.35 Ω, Rct = 9 ×10⁻³ Ω), highlighting its superior electrochemical performance. Furthermore, chronoamperometry confirmed the long-term stability of Ag/NCZ-MF/WS₂, showing negligible activity loss after 10 hours of continuous operation. The low intrinsic resistances, abundant active sites, high conductivity, enhanced and durable HER performance of Ag/NCZ-MF/WS₂ electrocatalyst, positioning it as a promising alternative to precious metal-based electrocatalysts.

中文翻译：

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WS₂ 和 Ag 薄膜包裹的三金属 Ni-Co-Zn 微片作为析氢反应的高效电催化剂

与贵金属相比，基于单一过渡金属的电催化剂通常表现出较低的 HER 活性。然而，结合多种过渡金属可以将 HER 活性提高到与贵金属相当的水平。同时，WS₂ 被认为是一种有效的 HER 电催化剂，正在进行的研究正在探索通过掺杂和异质结构形成来增强性能。在本研究中，通过将 WS₂ 和 Ag 薄膜与三金属 Ni-Co-Zn 微薄片 （NCZ-MF） 集成，开发了一种高效的 HER 电催化剂 （Ag/NCZ-MF/WS₂）。设计的电催化剂 Ag/NCZ-MF/WS₂ 表现出优异的 HER 性能，在 94 mV 的低过电位下实现了 10 mA/cm² 的电流密度，塔菲尔斜率为 56 mV/dec。电化学阻抗谱 （EIS） 显示溶液和电荷转移电阻最小 （Rs = 1.35 Ω， Rct = 9 ×10⁻³ Ω），突出了其卓越的电化学性能。此外，计时安培法证实了 Ag/NCZ-MF/WS₂ 的长期稳定性，在连续运行 10 小时后，活性损失可以忽略不计。Ag/NCZ-MF/WS₂ 电催化剂具有低本征电阻、丰富的活性位点、高导电性、增强和耐用的 HER 性能，使其成为贵金属基电催化剂的有前途的替代品。