2D MoS₂ nanostructures have recently attracted considerable attention because of their outstanding electrocatalytic properties. The synthesis of unique Co–Ru–MoS₂ hybrid nanosheets with excellent catalytic activity toward overall water splitting in alkaline solution is reported. 1T′ phase MoS₂ nanosheets are doped homogeneously with Co atoms and decorated with Ru nanoparticles. The catalytic performance of hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is characterized by low overpotentials of 52 and 308 mV at 10 mA cm⁻² and Tafel slopes of 55 and 50 mV decade⁻¹ in 1.0 m KOH, respectively. Analysis of X‐ray photoelectron and absorption spectra of the catalysts show that the MoS₂ well retained its metallic 1T′ phase, which guarantees good electrical conductivity during the reaction. The Gibbs free energy calculation for the reaction pathway in alkaline electrolyte confirms that the Ru nanoparticles on the Co‐doped MoS₂ greatly enhance the HER activity. Water adsorption and dissociation take place favorably on the Ru, and the doped Co further catalyzes HER by making the reaction intermediates more favorable. The high OER performance is attributed to the catalytically active RuO₂ nanoparticles that are produced via oxidation of Ru nanoparticles.

中文翻译：

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钴掺杂的1T'相MoS2纳米片上的钌纳米颗粒用于总水分解

2D MoS ₂纳米结构由于其出色的电催化性能，最近引起了相当大的关注。据报道，独特的Co-Ru-MoS ₂杂化纳米片的合成对碱性溶液中的总水分解具有出色的催化活性。1T'相MoS ₂纳米片均匀掺杂有Co原子，并用Ru纳米粒子修饰。氢气析出反应（HER）和氧气析出反应（OER）的催化性能的特征是在10 mA cm ^-2时低52和308 mV的超电势以及在1.0 m中55和50 mV十倍^-1的Tafel斜率KOH，分别。催化剂的X射线光电子和吸收光谱分析表明，MoS ₂很好地保留了其金属1T'相，从而保证了反应期间的良好电导率。碱性电解液中反应路径的吉布斯自由能计算证实了共掺杂MoS ₂上的Ru纳米粒子大大增强了HER活性。在Ru上有利地发生水吸附和离解，并且通过使反应中间体更有利，掺杂的Co进一步催化HER。高OER性能归因于通过Ru纳米颗粒的氧化产生的催化活性RuO ₂纳米颗粒。