An experiment was conducted to demonstrate that the MoSe2/Mo core-shell hierarchical nanostructures by a low-temperature plasma-assisted selenization process on the Mo 3D-hierarchical nanostructures with controlled shapes deposited by a glancing angle deposition system (GLAD) system. The mixed phases of MoSe2/Mo core?shell hierarchical nanostructures can be achieved at the low selenization temperature of 400°C, whereas the 2H-MoSe2/Mo core-shell 3D-hierarchical nanostructures dominate once the plasma-assisted selenization temperature exceeds 500°C. In particular, the mixed MoSe2/Mo core-shell nanoscrews exhibit the highest catalytic activities, with a Tafel slope as low as 34.7 mV dec-1, which is close to the theoretical value of 29 mV dec-1 and a low potential of -166 mV at J = 10 mA cm-2 dominated by a Volmer-Tafel reaction for the ideal hydrogen evolution reaction (HER) process. The high catalytic activities are attributed to the increased density of exposed edges and the metallic phase of the MoSe2 shell, providing a fast charge transfer.
- MoSe/Mo hierarchical nanostructures
- glancing angle deposition
- hydrogen evolution reaction