Growth of MoS2 nanosheets on M@N-doped carbon particles (M = Co, Fe or CoFe Alloy) as an efficient electrocatalyst toward hydrogen evolution reaction

The design and synthesis of a highly active noble metal-free electrocatalyst for hydrogen evolution reaction (HER) from water splitting are crucial for renewable energy technologies. Herein, we report the growth of molybdenum disulfide (MoS2) on N-doped carbon encapsulated metal particles ([email protected]@MoS2, where M = Co, Fe or CoFe alloy) as a highly active electrocatalyst for HER. The hierarchical MoS2 nanosheets are grown on [email protected] using the hydrothermal method. Our results show that [email protected]@MoS2 hybrid spheres exhibit excellent HER performance with an overpotential of 64 mV at a current density of 10 mA cm−2 and a small Tafel slope of 45 mV dec-1. In addition, [email protected]@MoS2 hybrid spheres have good long-term stability and durability in acidic conditions. Besides, density functional theory (DFT) simulations of the proposed catalysts are performed and suggest that the superior catalytic activity of [email protected]@MoS2 is due to the optimal electron transfer from [email protected] nanoparticles to MoS2 nanosheets. This electron transfer facilitates H+ interaction and adsorption, leading to a decreased Gibbs free energy (ΔGH* ≈ 0.08 eV) and local work function on the surface, which consequently enhances the HER performance.