Embedding CsPbBr 3 Quantum Dots into an In 2 O 3 Nanotube for Selective Photocatalytic CO 2 Reduction to Hydrocarbon Fuels.

Halide perovskite quantum dots (QDs) are one of the most prospective candidates for photocatalytic CO 2 reduction, but their photocatalytic performances are far from satisfactory due to structural instability and severe charge recombination. In this study, we demonstrated a CsPbBr 3 QDs/In 2 O 3 hierarchical nanotube (CPB/IO) for efficient CO 2 conversion, in which CsPbBr 3 QDs were well-dispersed on the In-MOF-derived In 2 O 3 nanotube by a facile self-assembly process. The optimized CPB/IO catalyst displayed an enhanced photocatalytic CO 2 performance with a (CO + CH 4 ) generation rate of 16.37 μmol·g -1 ·h -1 upon simulated solar illumination without a photosensitizer and sacrificial agent, which is 3.59 times stronger than that of pristine CsPbBr 3 QDs (4.56 μmol·g -1 ·h -1 ). Besides, the modified CsPbBr 3 QD catalyst exhibited an obvious increase of CH 4 selectivity and excellent stability after four cycles. The unique zero-dimensional (0D)/one-dimensional (1D) heterostructure and matching band potentials between CsPbBr 3 and In 2 O 3 supply an intimate interfacial contact, numerous active sites, and effective charge transfer for CO 2 photoreduction. This work can inspire the formation of novel halide-perovskite-involving photocatalysts for solar fuel formation.