Synthesizing cost-effective, highly active and stable electrocatalysts for hydrogen evolution reaction (HER) is incredibly critical for scalable hydrogen production through electrochemical water splitting, yet it remains a significant challenge. Noble metal-based materials are generally considered the most excellent electrocatalysts for HER, but their scarcity and high cost impede their comprehensive application. Herein, an auspicious strategy to couple highly active precious metals with transition metals as excellent HER catalysts is presented, which not only can effectively reduce the dosage of the precious metals, but also greatly improve the performance of catalysts. The desired electrocatalysts, based on nitrogen-doped carbon-RhNi alloy nanoparticles anchored on reduced graphene oxide nanosheets (NC-RhNi/rGO), are obtained from pyrolysis of bimetallic RhNi-MOFs/GO precursor. The as-prepared NC-RhNi/rGO catalyst achieves noticeable HER performance, with overpotentials of 37 and 34 mV at the current density of 10 mA cm⁻² in 1.0 M KOH and 0.5 M H₂SO₄, respectively, which are better than that of commercial Pt/C. Experimental results reveal that the superior activities are a benefit of the synergistic effect of bimetallic alloy and the collective effects of unique architecture, where the synergistic effect can facilitate electron transfer and the unique architecture provides rich active sites. This work provides a promising approach for the synthesis of highly efficient nanocomposite electrocatalysts for HER.

中文翻译：

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金属-有机骨架衍生的氮掺杂碳-RhNi合金锚固在石墨烯上，可实现高效的氢气释放反应

合成具有成本效益，高活性和稳定的氢析出反应（HER）的电催化剂对于通过电化学水分解法可扩展的氢生产至关重要，但是仍然是一项重大挑战。贵金属基材料通常被认为是HER最出色的电催化剂，但是其稀缺性和高成本阻碍了它们的广泛应用。本文提出了一种将高活性贵金属与过渡金属偶合作为优良HER催化剂的吉祥策略，它不仅可以有效地减少贵金属的用量，而且可以大大提高催化剂的性能。基于锚定在还原氧化石墨烯纳米片（NC-RhNi / rGO）上的氮掺杂碳-RhNi合金纳米颗粒，所需的电催化剂，得自双金属RhNi-MOF / GO前体的热解。所制备的NC-RhNi / rGO催化剂具有显着的HER性能，在10 mA cm的电流密度下具有37和34 mV的过电势在1.0 M KOH和0.5 MH ₂ SO ₄中分别为^-2，比市售Pt / C更好。实验结果表明，优异的活性是双金属合金的协同作用和独特结构的集体效应的有益之处，其中协同效应可以促进电子转移，独特的结构提供了丰富的活性位点。这项工作为合成用于HER的高效纳米复合电催化剂提供了一种有希望的方法。