Electrochemical water splitting has attracted great attention as a promising technique for efficiently producing hydrogen with high purity. Developing noble metal-free electrocatalysts with good activity for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is critical for achieving economical water-splitting devices. In this work, we report a facile strategy to construct a Ni(OH)₂/MoS₂ heterostructure via defect-mediated metal ion adsorption. Abundant defects were introduced into MoS₂ nanosheets using ion irradiation. By simply immersing the defective MoS₂ nanosheets into a nickel acetate solution, Ni ions were adsorbed on the defect sites of MoS₂ nanosheets and then transformed into a Ni hydroxide active phase. The obtained Ni(OH)₂/irradiated MoS₂ heterostructure exhibited both good HER and OER activities owing to the facilitated adsorption of reactants and reaction intermediates, as well as the strong electronic interactions near the heterointerfaces. The methodology used in this work can be generally applied to the synthesis of heterostructured electrocatalysts for other energy and environmental applications.

中文翻译：

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缺陷介导的金属离子的吸附，以构造氢氧化镍/ MoS ₂异质结构作为高性能的水分解电催化剂

作为有效地生产高纯度氢的有前途的技术，电化学水分解法已引起了极大的关注。开发对氢气析出反应（HER）和氧气析出反应（OER）具有良好活性的无贵金属电催化剂对于实现经济的水分解装置至关重要。在这项工作中，我们报告了一种通过缺陷介导的金属离子吸附构建Ni（OH）₂ / MoS ₂异质结构的简便策略。使用离子辐照将大量缺陷引入MoS ₂纳米片中。通过将有缺陷的MoS ₂纳米片简单地浸入乙酸镍溶液中，Ni离子被吸附在MoS ₂的缺陷部位上纳米片，然后转化为氢氧化镍活性相。所获得的Ni（OH）₂ /辐照的MoS ₂异质结构由于促进了反应物和反应中间体的吸附以及在异质界面附近的强电子相互作用而表现出良好的HER和OER活性。在这项工作中使用的方法通常可以应用于其他能源和环境应用的异质结构电催化剂的合成。