Hydrogen Evolution Reaction of γ-Mo0.5W0.5 C Achieved by High Pressure High Temperature Synthesis

Abstract

For the first time, the hydrogen evolution reaction (HER) electrocatalytic performances of incompressible γ-Mo 0.5 W 0.5 C, prepared by high-pressure, high-temperature (HPHT) synthesis, were investigated in the electrolyte. The polarization curve of the γ-Mo 0.5 W 0.5 C cathode exhibits the current density of 50 mA·cm −2 at an overpotential value of 320 mV. The corresponding Tafel slope of the incompressible γ-Mo 0.5 W 0.5 C is 74 mV·dec −1 . After a 1000-cycle test, and then exposure to the air for six months, the γ-Mo 0.5 W 0.5 C electrode performed a current density of 50 mA·cm −2 at an overpotential of 354 mV, which was close to the initial one.

The shape-dependent surface oxidation of 2D ultrathin Mo2C crystals

“…S1 †), while the peaks marked with triangles derive from the Cu substrate. 24,25 It has been reported that Mo 2 C has high stability in inert gas or reduction gas. In our case, XRD measurements have been conducted to probe the stability as a function of temperature ( Fig.…”