Preparation and high-efficient hydrogen evolution reaction of hydrangea-like MoS_2 hollow microspheres modified by needle-like g-C_3N_4

摘要

To exploit non-precious metallic and earth-abundant elements for effective electrocatalytic hydrogenation catalysts, a unique structure electrocatalytic hydrogenation catalyst is fabricated using hydrangea-like molybdenum disulfide (MoS2) hollow microsphere with an average external diameter of 2.5 mu m and the needle-like graphitic carbon nitride (g-C3N4) with an average length of 1 mu m. The special morphology of the g-C3N4/MoS2 composite heterostructure with advantages of more exposed edge, better conductivity and defect-structures remarkably improves electrochemical active sites, which leads to an outstanding electrocatalytic performance for hydrogen evolution reaction (HER) with a small Tafel slop of 55.7 mV decade(-1) and low overpotential (98.8 mV at 10 mA cm(-2)) more than most MoS2-based catalysts reported. The unique g-C3N4/MoS2 composite heterostructure can be applied in the field of energy conversion and storage.