Influence of Transition Metal on the Hydrogen Evolution Reaction over Nano-Molybdenum-Carbide Catalyst

摘要

The highly efficient electrochemical hydrogen evolution reaction (HER) provides a promising way to solve energy and environment problems. In this work, various transition metals (Fe, Co, Ni, Cu, Ag, and Pt) were selected to support on molybdenum carbides by a simple organic-inorganic precursor carburization process. X-ray diffraction (XRD) analysis results indicated that the β-Mo 2 C phase was formed in all metal-doped samples. X-ray photoelectron spectroscopy analysis indicated that the binding energy of Mo 2+ species (Mo 2 C) shifted to a lower value after metal was doped on the molybdenum carbide surface. Comparing with pure β-Mo 2 C, the electrocatalytic activity for HER was improved by transition metal doping on the surface. Remarkably, the catalytic activity improvement was more obvious when Pt was doped on molybdenum carbide (2% Pt-Mo 2 C). The 2% Pt-Mo 2 C required a η 10 of 79 mV, and outperformed that of pure β-Mo 2 C (η 10 = 410 mV) and other transition metal doped molybdenum carbides, with a small Tafel slope (55 mV/dec) and a low onset overpotential (32 mV) in 0.5 M H 2 SO 4 . Also, the 2% Pt-Mo 2 C catalyst demonstrated a high stability for the HER in 0.5 M H 2 SO 4 . This work highlights a feasible strategy to explore efficient electrocatalysts with low cost via engineering on the composition and nanostructure.