The paper by Wang, Guan, and Lou (2018) presents the construction of sandwich-like ZnIn₂S₄-In₂O₃ hierarchical tubular heterostructures for efficient CO₂ photoreduction. The authors designed and fabricated these heterostructures by growing ZnIn₂S₄ nanosheets on both inner and outer surfaces of In₂O₃ microtubes. This unique design integrates In₂O₃ and ZnIn₂S₄ into hierarchical one-dimensional (1D) open architectures with double-heterojunction shells and ultrathin two-dimensional (2D) nanosheet subunits. The structure accelerates the separation and transfer of photogenerated charges, provides a large surface area for CO₂ adsorption, and exposes abundant active sites for surface catalysis. The optimized ZnIn₂S₄-In₂O₃ photocatalyst exhibits excellent performance in reductive CO₂ deoxygenation, with a CO evolution rate of 3075 μmol h⁻¹ g⁻¹ and high stability. The study highlights the importance of intimate interfacial contact and strong interactions in the heterostructures for enhancing the efficiency of CO₂ photoreduction.The paper by Wang, Guan, and Lou (2018) presents the construction of sandwich-like ZnIn₂S₄-In₂O₃ hierarchical tubular heterostructures for efficient CO₂ photoreduction. The authors designed and fabricated these heterostructures by growing ZnIn₂S₄ nanosheets on both inner and outer surfaces of In₂O₃ microtubes. This unique design integrates In₂O₃ and ZnIn₂S₄ into hierarchical one-dimensional (1D) open architectures with double-heterojunction shells and ultrathin two-dimensional (2D) nanosheet subunits. The structure accelerates the separation and transfer of photogenerated charges, provides a large surface area for CO₂ adsorption, and exposes abundant active sites for surface catalysis. The optimized ZnIn₂S₄-In₂O₃ photocatalyst exhibits excellent performance in reductive CO₂ deoxygenation, with a CO evolution rate of 3075 μmol h⁻¹ g⁻¹ and high stability. The study highlights the importance of intimate interfacial contact and strong interactions in the heterostructures for enhancing the efficiency of CO₂ photoreduction.