One‐Step Synthesis of MoS 2 Nanosheet Arrays on 3D Carbon Fiber Felts as a Highly Efficient Catalyst for the Hydrogen Evolution Reaction

Many efforts have been made to pursue low-cost and efficient electrocatalysts for the hydrogen evolution reaction (HER), which is important for real water splitting applications. Herein, a 3D hydrogen evolution cathode is designed and synthesized by in situ grafting MoS2 nanosheets on a 3D carbon fiber felt (CFF) framework. As a low-cost HER catalyst, MoS2 nanosheets have effective hydrogen atom adsorption activity due to their uniform distribution in the 3D CFF framework. Meanwhile, the 3D CFF framework facilitates the electrolyte to penetrate into the inner space and accelerate the electron transfer, which leads to a drastic increase in the HER activity. Electrochemical measurements show that the MoS2/CFF composite exhibit an excellent electrocatalytic activity with 101 mV overpotential, affording a current density of 10 mA cm(-2) and a high exchange current density of 3.3 x 10(-2) mA cm(-2). Therefore, this 3D material, which has splendid catalytic performance and stability, exhibits great potential in the electrocatalytic hydrogen production for water splitting.