Construction of ZnInS-InO Hierarchical Tubular Heterostructures for Efficient CO Photoreduction

We demonstrate the rational design and construction of sandwich-like ZnInS-InO hierarchical tubular heterostructures by growing ZnInS nanosheets on both inner and outer surfaces of InO microtubes as photocatalysts for efficient CO photoreduction. The unique design integrates InO and ZnInS into hierarchical one-dimensional (1D) open architectures with double-heterojunction shells and ultrathin two-dimensional (2D) nanosheet subunits. This design accelerates the separation and transfer of photogenerated charges, offers large surface area for CO adsorption, and exposes abundant active sites for surface catalysis. Benefiting from the structural and compositional merits, the optimized ZnInS-InO photocatalyst exhibits outstanding performance for reductive CO deoxygenation with considerable CO generation rate (3075 μmol h g) and high stability.