Porous carbon coupled with an interlaced MoP–MoS2 heterojunction hybrid for efficient hydrogen evolution reaction

The design and development of electrocatalysts composed of non-noble-metal catalysts with both large surface area and high electrical conductivities are crucial for the hydrogen evolution reaction（HER）.Here, a xylose-based porous carbon is coupled with a MoS-Mo P heterojunction（MoS-Mo P/FPC） hybrid and used as a promising catalyst for HER. The hybrid is prepared by immobilizing petal-like MoSnanosheets on porous carbon（MoS/FPC）, followed by controlling the phosphidation in Ar/Hto form MoS-Mo P/FPC. Red phosphorus provides the P species that can induce the construction of the heterojunction under the reducing atmosphere, along with the generation of a Mo P phase and the splitting of the MoSphase. The as-prepared MoS-Mo P/FPC catalyst offers a low overpotential of 144 mV at a current density of 10 m A cmand a small Tafel slope of 41 m V decfor the HER in acidic media, as well as remarkable stability. Apart from the active nature of the hybrid, its outstanding activity is attributed to the MoS-Mo P heterojunction, and the good charge/mass-transfer ability of porous carbon. This strategy provides a new method to develop and design low-cost and high-performance catalysts for the HER.