Flower-like MoS2 with stepped edge structure efficient for electrocatalysis of hydrogen and oxygen evolution

Abstract A flower-like MoS 2 with a stepped edge structure was successfully and controllably fabricated as a bifunctional electrocatalyst efficient for hydrogen and oxygen evolution reactions. The hierarchically porous polycrystalline MoS 2 was characterized by a combination analysis of XRD, Raman, XPS, N 2 -BET, SEM and TEM. In the hydrogen evolution reaction (HER), this as-obtained MoS 2 /Ni catalyst presents significantly enhanced performance versus most previously studied catalysts. In the oxygen evolution reaction (OER), the electrocatalyst MoS 2 /Ni gives rise to a rather low overpotential of ∼0.335 V at 20.0 mA cm −2 and much enhanced durability over 6 h.