The article reports the development of an efficient and robust molybdenum disulfide/cobalt diselenide (MoS2/CoSe2) hybrid catalyst for electrochemical hydrogen evolution. The catalyst is synthesized by in situ growth of MoS2 on the surface of CoSe2 nanobelts in an acidic medium. This hybrid material exhibits fast hydrogen evolution kinetics with a low onset potential of −11 mV and a Tafel slope of 36 mV per decade, outperforming non-noble metal catalysts and approaching the performance of commercial platinum/carbon catalysts. The high activity is attributed to the synergistic effects between MoS2 and CoSe2, which enhance the catalytic sites and improve the HER kinetics. The MoS2/CoSe2 hybrid also demonstrates excellent long-term stability, making it a promising candidate for practical hydrogen evolution applications.The article reports the development of an efficient and robust molybdenum disulfide/cobalt diselenide (MoS2/CoSe2) hybrid catalyst for electrochemical hydrogen evolution. The catalyst is synthesized by in situ growth of MoS2 on the surface of CoSe2 nanobelts in an acidic medium. This hybrid material exhibits fast hydrogen evolution kinetics with a low onset potential of −11 mV and a Tafel slope of 36 mV per decade, outperforming non-noble metal catalysts and approaching the performance of commercial platinum/carbon catalysts. The high activity is attributed to the synergistic effects between MoS2 and CoSe2, which enhance the catalytic sites and improve the HER kinetics. The MoS2/CoSe2 hybrid also demonstrates excellent long-term stability, making it a promising candidate for practical hydrogen evolution applications.