Dynamical modulation and electrochemical water splitting effect of oxygen doped onto MoS2 core.shell spheres

Monodispersed MoS2 core- shell spheres were produced by annealing precursor MoS2 core- shell superspheres at 900. in Ar. Simultaneously, O- doping amount (atomic fraction) can be tuned from 23.1% of precursor to 17.6%, 10.8%, 5.5%, and 6.2% of as-prepared materials by regulating the heating rate of 20, 10, 5, and 2.center dot min-1, respectively. The lower rate results in a lower amount of O doped onto MoS2 core-shell spheres. Based on the special quasi- molecular superlattices of precursors, an in- situ anion exchange reaction mechanism was proposed to understand the dynamical modulation of O- doping. The study on the electrochemical properties of the materials demonstrates that their electrochemical performance in splitting water can be improved by tuning the O-doping amount.