Stable Mo/1T-MoS₂ Monolith Catalyst with a Metallic Interface for Large Current Water Splitting

To achieve global carbon neutrality, the realization of highly active and stable catalysts is critical for water splitting to produce green hydrogen (H₂). MoS₂ is considered to be the most promising non-precious metal catalyst for H₂ evolution because of its excellent properties. Herein, we report a metal-phase MoS₂ (1T-MoS₂) synthesized using a simple hydrothermal method. Using a similar procedure, we synthesize a monolithic catalyst (MC) in which 1T-MoS₂ is vertically bonded to a metal molybdenum plate via strong covalent bonds. These properties endow the MC with an extremely low-resistance interface and mechanical robustness, equipping it with outstanding durability and fast charge transfer. Results show that the MC can achieve stable water splitting at 350 mA cm^-2 current density with a low 400 mV overpotential. The MC exhibits negligible performance decay after 60 h of operation at a large current density of 350 mA cm^-2. This study provides a novel possible MC with robust and metallic interfaces to achieve technically high current water splitting to produce green H₂.