Five-fold intertwined Agx Ni1-x (x=0.01-0.25) heterogeneous alloy nanocrystal (NC) catalysts, prepared through unique reagent combinations, are presented. With only ca. 5 at % Ag (AgNi-5), Pt-like activity has been achieved at pH 14. To reach a current density of 10 mA cm-2 the extremely stable AgNi-5 requires an overpotential of 24.0±1.2 mV as compared to 20.1±0.8 mV for 20 % Pt/C, both with equal catalyst loading of 1.32 mg cm-2 . The turnover frequency (TOF) is as high as 2.1 H2  s-1 at 50 mV (vs. RHE). Site-specific elemental analyses show the Ag:Ni compositional variation, where the apex and edges of the decahedra are Ag-rich, thereby exposing Ni onto the faces to achieve maximum charge transport for an exceptional pH universal HER activity. DFT calculations elucidate the relative H-atom adsorption capability of the Ni centers as a function of their proximity to Ag atom.

中文翻译：

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在十面体几何形状的异相合金中用最少的银微调镍，以提供类似铂的氢析出活性。

介绍了通过独特的试剂组合制备的五倍缠绕的Agx Ni1-x（x = 0.01-0.25）多相合金纳米晶体（NC）催化剂。仅约。Ag（AgNi-5）含量为5 at％时，在pH 14时获得了类似Pt的活性。要达到10 mA cm-2的电流密度，极其稳定的AgNi-5需要24.0±1.2 mV的过电势（相比于20.1）对于20％Pt / C为±0.8 mV，两者均以1.32 mg cm-2的相等催化剂负载。在50 mV（vs. RHE）下，周转频率（TOF）高达2.1 H2 s-1。特定位置的元素分析表明，Ag：Ni的组成变化很大，十足点的顶点和边缘富含Ag，从而将Ni暴露在脸上以实现最大的电荷传输，从而具有出色的pH通用HER活性。