Oxygen vacancy modified Bi2MoO6/WO3 electrode with enhanced photoelectrocatalytic degradation activity toward RhB

A novel oxygen vacancy (OVs) modified Bi 2 MoO 6 /WO 3 hybrid electrode based on the ITO glass was successfully fabricated by a facile two-step hydrothermal and solvothermal method with one calcination process between two reactions. The result exhibited an enhanced optical harvesting and photogenerated electron migration capability. In the degradation process of rhodamine B (RhB), the hybrid electrode showed a better photoelectrocatalytic removal ratio of 80.1% within 4 h under visible light irradiation and 2.0 V bias, which is mainly ascribed to the synergistic promotion of surface OVs, heterostructure and external bias. The optical features and band structures of the composite catalyst were analyzed to give out the possible electrode system mechanism of the PEC degradation process. This work not only constructs a newly designed OVs Bi 2 MoO 6 /WO 3 photoelectrode but also provides some investigations in fabricating and controlling process of photoelectrodes.