Hydrogen Evolution Reaction Property in Alkaline Solution of Molybdenum Disulfide Modified by Surface Anchor of Nickel–Phosphorus Coating

摘要

Molybdenum disulfide (MoS 2 ) is unfavorable for practical application in the hydrogen evolution reaction (HER) process due to its inert basal surface, inferior conductivity, and limited amount of active edge sites. For the purpose of enhancing the HER performance of this catalyst, the HER activity of its basal surface should be increased. Herein, three types of nickel-phosphorus (Ni–P) coatings—namely, low phosphorus (LP), medium phosphorus (MP) and high phosphorus (HP) —were anchored onto the surfaces of MoS 2 nanoparticles via an electroless plating process; thus, three Ni–P/MoS 2 composites (Ni–LP/MoS 2 , Ni–MP/MoS 2 , and Ni–HP/MoS 2 ) were fabricated. Crystal structures, morphologies, chemical components, and HER performances of each in an alkaline solution were characterized. Both Ni–LP/MoS 2 and Ni–MP/MoS 2 showed a crystal nature, while the amorphous feature for Ni–HP/MoS 2 was validated. The three Ni–P/MoS 2 composites exhibited a higher HER activity than the pure MoS 2 . The HER performance of the Ni–MP/MoS 2 composite was more outstanding than those of other two composites, which could be attributed to the presence of metastable nickel phosphides, and the excellent conductivity of Ni–MP coating anchored on the basal surface of MoS 2 .