The development of efficient hydrogen evolution reaction (HER) catalysts is of great importance for electrolytic hydrogen production in alkaline media. In this communication, we report the development of an ultrafine PtNi nanoparticle-decorated Ni nanosheet array with ultralow Pt loading (7.7 wt%) as a superior electrocatalyst for the alkaline HER. Such a nanoarray drives a geometrical current density of 10 mA cm⁻² at an overpotential as low as 38 mV in 0.1 M KOH, outperforming commercial 20 wt% Pt/C and all reported HER electrocatalysts. Remarkably, it also shows outstanding long-term electrochemical durability with a faradaic efficiency close to 100%. This work provides us with an attractive ultralow-Pt-content catalyst material in water-splitting devices toward high-performance and durable electrochemical production of hydrogen fuels.

中文翻译：

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具有超低Pt负载的超细PtNi纳米颗粒修饰的Ni纳米阵列可实现优异的碱析氢电催化作用†

高效氢析出反应（HER）催化剂的开发对于在碱性介质中电解制氢非常重要。在本次交流中，我们报告了一种超细PtNi纳米粒子修饰的Ni纳米片阵列的开发，该阵列具有超低的Pt负载量（7.7重量％），是碱性HER的优良电催化剂。这种纳米阵列可驱动10 mA cm ^-2的几何电流密度在0.1 M KOH中的低电势下，其电势低至38 mV，优于市售的20 wt％Pt / C和所有报道的HER电催化剂。值得注意的是，它还显示出出色的长期电化学耐久性，法拉第效率接近100％。这项工作为我们提供了一种有吸引力的超低Pt含量的水分解装置催化剂材料，用于高性能和持久的氢燃料电化学生产。