Porous In₂O₃ Hollow Tube Infused with g-C₃N₄ for CO₂ Photocatalytic Reduction

Converting CO 2 into energy-rich fuels by using solar energy is a sustainable solution that promotes a carbon-neutral economy and mitigates our reliance on fossil fuels. However, affordable and efficient CO 2 conversion remains an ongoing challenge. Here, we introduce polymeric g-C 3 N 4 into the pores of a hollow In 2 O 3 microtube. This architecture results in a compact and staggered arrangement between g-C 3 N 4 and In 2 O 3 components with an increased contact interface for improved charge separation. The hollow interior further contributes to strengthening light absorption. The resulting g-C 3 N 4 -In 2 O 3 hollow tubes exhibit superior activity (274 μmol·g –1 ·h –1 ) toward CO 2 to CO conversion in comparison with those of pure In 2 O 3 and g-C 3 N 4 (5.5 and 93.6 μmol·g –1 ·h –1, respectively), underlining the role of integrating g-C 3 N 4 and In 2 O 3 in this advanced system. This work offers a strategy for the advanced design and preparation of hollow heterostructures for optimizing CO 2 adsorption and conversion by integrating inorganic and organic semiconductors.