Developing efficient water-splitting electro-catalysts with high mass activity is in urgent need for large-scale sustainable production of hydrogen but, still remains as a big challenge. Herein, we report a one-pot method to fabricate a series of core@shell Ni@RuM (M=Ni or Co) nanocrystals (NCs) with Ni as the core and tunable RuM (M=Ni or Co) as the alloy shell for efficient water-splitting catalysis. Among these core@shell NCs, the obtained Ni@RuNi NCs exhibit the highest intrinsic activity for hydrogen evolution reaction (HER) and possess an outstanding mass activity of 1590 mA mg_Ru⁻¹ at 0.07 V vs. reversible hydrogen electrode (RHE), which is 1.7 times higher than that of commercial Pt/C (950 mA mg_Pt⁻¹). As for oxygen evolution reaction (OER), the prepared Ni@Ru_0.4Co_0.6 NCs with optimized shell composition achieve more enhanced mass activity of 270 mA mg_Ru⁻¹ at 1.56 V vs. RHE, approaching three times higher than that of commercial RuO₂ (89 mA mg_Ru⁻¹). The superb mass activity of these Ni@RuM (M=Ni or Co) NCs can be attributed to their core@shell structure and modulated electronic structure through alloying with Ni or Co metal in the shell.

迫切需要开发大规模活动的高效水分解电催化剂，以实现大规模可持续的氢气生产，但仍然是一个巨大的挑战。本文中，我们报告了一种通过一锅法制造一系列以Ni为核，可调谐RuM（M = Ni或Co）为核壳的Ni @ RuM（M = Ni或Co）纳米核壳纳米晶体（NC）的方法。用于有效的水分解催化。在这些核壳型NC中，相对于可逆氢电极（RHE），所获得的Ni @ RuNi NCs对氢析出反应（HER）表现出最高的固有活性，并且在0.07 V时具有1590 mA mg _Ru ^-1的出色质量活性，比市售Pt / C（950 mA mg _Pt ^-1）高1.7倍）。至于氧释放反应（OER），制备的Ni @ Ru _0.4 Co _0.6 NCs具有优化的壳组成，相对于RHE，在1.56 V时具有更高的270 mA mg _Ru ^-1的质量活性，比市售RuO高三倍。₂（89 mA毫克_Ru ^-1）。这些Ni @ RuM（M = Ni或Co）NCs的出色的质量活动可以归因于它们的核壳结构和通过与壳中的Ni或Co金属合金化而调制的电子结构。