Ferroelectric Heterojunction and Bi-Ti-In Trimetallic Sites Mediated Co2 Coordination Model on the Indium-Doped Bi4ti3o12-Cuin5s8 for Controlling the Selectivity of Photoreduction of Co2

Defect engineering of metal compounds provides an effective strategy for customizing surface frustrated Lewis pairs (SFLP)and metal sites mediated CO2 coordination model.The indium-doped Bi4Ti3O12-CuIn5S8(CIS-IBTO)was synthesized by hydrothermal method. The Bi-Ti-In trimetallic sites mediated CO2 coordination model provide CO2 activation sites. In addition, the spontaneous polarization of the CIS-IBTO ferroelectric heterojunction promotes the separation and transmission of photogenerated carriers, and finally achieves accurately controlling the CO2 photoreduction selectivity from CO to CH3OH and high-efficiency photocatalytic activity. The CO selectivity of BTO is 88.60% (5.05μmol.g-1.h-1), and the CO selectivity of CIS-BTO is 94.55% (16.31μmol.g-1.h-1), but the CH3OH selectivity of CIS-IBTO-2 reaches 95.96% (32.08μmol.g-1.h-1).The Bi-Ti-In mediated CO2 coordination model in CIS-IBTO-2 can control the generation of CH3OH, so the selectivity customization from CO to CH3OH is proved to be achievable. This illustrates a new effective strategy of CO2 photoreduction engineering, and is a further step towards customizing CO2 solar refinery products