Abundant electrochemical active sites, high electronic conductivity as well as stable structure and electrochemical activity are indispensable but usually incompatible to the ideal electrocatalysts for hydrogen evolution reaction (HER). Herein, an efficient and stable MoS₂-Ti₃C₂ MXene electrocatalyst is synthesized using a delicately designed one-step hydrothermal method, in which the few-layers thick, edge-oriented, high-percentage 1T′-phase (∼ 85.0 %) MoS₂ nanosheets are well grown on the cation-modified Ti₃C₂ MXene and stabilize Ti₃C₂ MXene against spontaneous oxidation caused by dissolved-oxygen. The structure and phase engineering of MoS₂ as well as the fully surface-shielding Ti₃C₂ MXene endow the as-synthesized MoS₂-Ti₃C₂ MXene electrocatalyst with a wealth of accessible active sites and high electrical conductivity for HER together with excellent structure stability. Consequently, the as-synthesized MoS₂-Ti₃C₂ MXene exhibits remarkable electrocatalytic HER performance in acidic medium with a low overpotential of 98 mV at 10 mA cm^-2, a depressed Tafel slope of 45 mV dec^-1 and a low electrochemical resistance.

丰富的电化学活性位，高电导率以及稳定的结构和电化学活性是必不可少的，但通常与用于析氢反应（HER）的理想电催化剂不相容。在此，采用精心设计的一步水热法合成了高效稳定的MoS ₂ -Ti ₃ C ₂ MXene电催化剂，其中几层厚，边缘取向，高百分比的1 T'相（〜85.0） ％）MoS ₂纳米片在阳离子改性的Ti ₃ C ₂ MXene上生长良好并稳定Ti ₃ C ₂MXene抵抗由溶解氧引起的自发氧化。MoS ₂的结构和相工程以及完全表面屏蔽的Ti ₃ C ₂ MXene使得合成后的MoS ₂ -Ti ₃ C ₂ MXene电催化剂具有大量可及的活性位点和HER的高电导率，以及优异的结构稳定性。因此，合成后的MoS ₂ -Ti ₃ C ₂ MXene在酸性介质中表现出卓越的电催化HER性能，在10 mA·cm ^-2时低过电势为98 mV ，凹陷的Tafel斜率为45 mV·dec ^-1 电化学电阻低。