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.