Unveiling S‐Scheme Charge Transfer Pathways in In2S3/Nb2O5 Hybrid Nanofiber Photocatalysts for Low‐Concentration CO2 Hydrogenation

Unveiling the charge separation and transfer pathways and exploring low‐cost and durable heterojunction photocatalysts are still two key challenges in achieving high‐efficient solar fuel generation from low‐concentration carbon dioxide. Herein, the layered In2S3‐modified Nb2O5 hybrid nanofiber photocatalysts with core–shell structures for efficient low‐concentration CO2 hydrogenation are constructed. The as‐prepared binary S‐scheme photocatalysts show excellent CO generation of 60.36 μmol g−1 h−1, which is 5.6 and 3.8 times higher than that of Nb2O5 and In2S3, which not only exhibits the CO generation in low‐concentration CO2 but also is superior to most photocatalysts without sacrificial agents or cocatalysts. In situ illuminated X‐ray photoelectron spectroscopy analysis indicates the S‐scheme charge transfer pathways formed due to the unmatched Fermi level, creating an internal electric field at the core/shell interface, driving the separation of the photoexcited charge carriers. This work will provide a promising strategy for constructing nanofiber‐based heterojunction photocatalysts for efficient low‐concentration CO2 hydrogenation reactions.