To meet the increasing demands for sustainable and clean hydrogen energy sources, development of pH-tolerant electrocatalysts with high-performance and low-cost toward hydrogen evolution reaction (HER) is an important but challenging task. MoS₂ is postulated as a promising candidate for HER in acidic solution, however, showing poor activity in alkaline media. Herein, to widen its application in various media, we first report the synthesis of NiMoS₃ nanorods using a hydrothermal method that starts from NiMoO₄ nanorods. The incorporation of Ni atoms in Mo–S could arouse the synergism of ternary Ni–Mo–S and create abundant defect sites, thus substantially improving the inherent catalytic activity and catalytic sites. More importantly, Ni endows Mo–S with excellent catalytic activity in alkaline solution. As a result, NiMoS₃ exhibits large cathodic current, low overpotetnial, and stable durability for HER in H₂SO₄ and especially in KOH. The overpotetnial at current density of 10 mA cm^–2 is as low as 126 mV in KOH, making it a promising candidate for HER electrocatalyst.

中文翻译：

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NiMoS ₃纳米棒作为可耐受pH值的高效氢析出电催化剂

为了满足对可持续和清洁氢能源不断增长的需求，开发具有高性能和低成本的氢分解反应（HER）的耐pH值的电催化剂是一项重要但具有挑战性的任务。MoS ₂被认为是酸性溶液中HER的有希望的候选者，但是，在碱性介质中显示出较差的活性。在此，为了扩大其在各种介质中的应用，我们首先报道了从NiMoO ₄开始的水热法合成NiMoS ₃纳米棒的过程。纳米棒。Mo-S中掺入Ni原子可引起三元Ni-Mo-S的协同作用并产生大量的缺陷位点，从而大大提高了固有的催化活性和催化位点。更重要的是，Ni使Mo–S在碱性溶液中具有出色的催化活性。结果，NiMoS ₃对H ₂ SO ₄尤其是在KOH中的HER表现出大的阴极电流，低的过电位和稳定的耐久性。在KOH中，电流密度为10 mA cm ^–2时，过电位低至126 mV，这使其成为HER电催化剂的有希望的候选者。