The A-site and B-site regulation of LaCoO₃ nanofiber based on electrospinning for boosting photocatalytic CO₂ conversion

Photocatalytic CO₂ reduction with perovskite can effectively address both energy and environmental issues. Nevertheless, it remains challenging to prepare photocatalysts with suitable hollow tubular structures in rational. Herein, the La_1-xSr_xCo_1-δFe_δO₃ nanofiber with a hollow tubular structure was fabricated through an electrospinning method. The hollow nanofiber structure was constructed by doping Sr atoms in the A-site and Fe atoms in the B-site of LaCoO₃ perovskite. The characterization of TEM proved that the hollow tubular structural La_1-xSr_xCo_1-δFe_δO₃ nanofiber exhibited an external diameter of about 95 nm and an internal diameter of about 50 nm. The hollow tubular structural La_1-xSr_xCo_1-δFe_δO₃ nanofiber showed superior carrier separation ability which could exhibit significant advantages for photocatalytic CO₂ reduction. The CH₃OH generation rate over the optimized La_0.8Sr_0.2Co_0.7Fe_0.3O₃ nanofiber could reach 5.25 µmol⋅g⁻¹⋅h⁻¹. This work highlighted an electrospinning strategy to build a hollow tubular structural La_1-xSr_xCo_1-δFe_δO₃ nanofiber for enhancing photoreduction CO₂.