In situ formation of N-doped carbon-coated porous MoP nanowires: a highly efficient electrocatalyst for hydrogen evolution reaction in a wide pH range

摘要

Molybdenum phosphide (MoP) is a promising non-noble-metal electrocatalyst for hydrogen evolution reaction (HER), but coordination of high HER activity and fast HER kinetics is a challenge. Herein, we proposed a highly efficient HER electrocatalyst composed of N-doped carbon-coated porous MoP nanowires (MoP@NC) by phosphorization of organic-inorganic Mo3O10(C6H8N)(2)center dot 2H(2)O NWs. The MoP@NC with mesopores MoP framework and micropores N-doped carbon-coating facilitates the electrolyte/bubbles diffusion and ion/electron transport, owns abundant active sites and smaller adsorption free energy of H (Delta G(H*)) at the interface boosting the HER performance. Small overpotentials (eta(10)) of 96, 191 and 149 mV with Tafel slopes of 49.2, 95.0 and 61.7 mV dec(-1) in acidic, neutural and alkaline solutions were achieved as well as excellent stability, which is better than that of bare MoP NWs and other MoP-based electocatalysts. The results reveal a simple and effective approach to produce inexpensive electrocatalysts with excellent HER properties in a wide pH range.