The efficient generation of clean hydrogen energy through the water splitting has attracted much more attention. However, lacking of low-cost and highly efficient electrocatalysts is still a major obstacle for hydrogen generation via hydrogen evolution reaction (HER). Herein, for the first time, we present a facile, low-cost and scalable synthesis of highly efficient and stable Mo₂C/CNT hybrid via spray drying followed by carbonization process (Mo₂C/CNT-SC). The optimized Mo₂C/CNT-SC hybrid delivers superior HER performance with a low Tafel slop of 53.6 mV dec⁻¹, and an extremely low onset overpotential of ∼20 mV (vs RHE) @ 1 mA cm⁻², which is much lower than those of most reported electrocatalysts and comparable to that of Pt-based electrocatalysts. The Mo₂C/CNT-SC hybrid also shows excellent stability even after 1000 cycles. The superior HER performance of Mo₂C/CNT-SC can be attributed to its unique conductive and porous structure constructed by ultrasmall Mo₂C nanoparticles homogenously embedded in CNT networks, which can not only provide sufficient HER active sites, but also guarantee full contact between the Mo₂C nanoparticles and CNT networks. The principles demonstrated in our work can be extended to scalable synthesis of other non-noble metal electrocatalysts with excellent HER performance.

通过水分解有效产生清洁氢能引起了更多的关注。然而，缺乏低成本和高效的电催化剂仍然是通过氢析出反应（HER）产生氢的主要障碍。在这里，我们首次提出了一种通过喷雾干燥，随后进行碳化工艺（Mo ₂ C / CNT-SC）的高效，稳定的Mo ₂ C / CNT杂化物的简便，低成本，可扩展合成方法。经过优化的Mo ₂ C / CNT-SC杂化物具有卓越的HER性能，Tafel斜率低至53.6 mV dec ^-1，在1 mA cm ^-2时的起伏极低，约为20 mV（vs RHE）。，这比大多数报道的电催化剂要低得多，并且可以与基于Pt的电催化剂相媲美。即使经过1000次循环，Mo ₂ C / CNT-SC杂化物也显示出优异的稳定性。Mo ₂ C / CNT-SC优异的HER性能归因于其独特的导电和多孔结构，该结构由均匀嵌入CNT网络的超小Mo ₂ C纳米颗粒构成，不仅可以提供足够的HER活性位点，而且还可以保证完全接触在Mo ₂ C纳米颗粒和CNT网络之间。我们工作中展示的原理可以扩展到具有出色HER性能的其他非贵金属电催化剂的可扩展合成。