P Doped MoO3-x Nanosheets as Efficient and Stable Electrocatalysts for Hydrogen Evolution.

A P doped MoO3-x nanocomposite material with rich oxygen vacancies is successfully fabricated by a two-step intercalation method, which presents superior activity for the hydrogen evolution reaction with low overpotential and fast electron transfer. In 0.5 m H2 SO4 , it displays an overpotential of 166 mV for driving the current density of 10 mA cm-2 . Moreover, it also shows a good catalytic stability in the electrolytes with different pH, 0.5 m H2 SO4 (strong acid), 0.5 m Na2 SO4 (neutral solution), and 0.1 m NaOH (strong base). The superior catalytic activity and stability are due to to the synergistic effect between the P element doping and the oxygen vacancies.