Biphase TiO2\Zn-tetracarboxy-phthalocyanine twin S-scheme heterojunction nanowires with efficient charge transfer and CO2 photocatalytic conversion

Abstract

Constructing heterojunction photocatalysts with proper charge transfer channels has been confirmed to be a promising strategy for CO₂ photoreduction into chemical fuels. However, promoting photoinduced charge separation in traditional heterojunction catalysts still remains a big obstacle for practical applications. In this work, the TiO₂(B)-Anatase\ZnTcPc twin S-scheme heterojunctions are designed and constructed by loading Zn (II) tetracarboxy phthalocyanine (ZnTcPc) on the prepared TiO₂(B)-Anatase biphase TiO₂ nanowires by self-assemble strategy. The TiO₂(B)-Anatase\ZnTcPc twin S-scheme heterojunctions effectively promote charge transport across the multi-heterointerfaces and enhance visible light absorption and CO₂ adsorption. Thus the optimized hybrid photocatalyst exhibits a remarkable photocatalytic CO₂ reduction performance, and the CO yield reaches 237.8μmol g⁻¹h⁻¹. The CO₂ photoreduction mechanism and charge transfer properties in the twin S-scheme heterojunction are also investigated and characterized. This research offers a viable approach to enhancing the heterojunction system for excellent photocatalytic performance.