In-situ synthesis of MoS₂/Co₉S₈ heterostructure for efficient HER electrocatalyst

It is of great significance for the development of hydrogen energy to explore efficient, stable, and resource-rich non-precious metal eletrocatalysts instead of precious metal eletrocatalysts for hydrogen evolution reaction (HER). In this work, we in-situ synthesized the MoS₂/Co₉S₈ heterostructure by synthesizing MoS₂@Co₉S₈ nanosheets on the carbon cloth (MoS₂@Co₉S₈/CC). Benefiting from the abundant active sites provided in the nanosheet structure grown with few layers of MoS₂ and the synergistic effect caused by the in situ synthesized heterostructure between MoS₂ and Co₉S₈, MoS₂@Co₉S₈/CC exhibits excellent HER catalytic performance with an ultra-low overpotential of 73 mV at current density of 10 mA cm⁻² and a Tafel slope of 78 mV dec⁻¹.