Fabrication of nanofibrous A- or B-sites substituted LaCoO_3 perovskites with macroscopic structures and their catalytic applications

摘要

Fabrication of nanofibrous La_(1-x)Ce_xCoO_3 (x = 0.05, 0.1, 0.2) and LaMn_xCo_(1-x)O_3 (x = 0.2, 0.5, 0.8) perovskite-type oxides with macroscopic structures can be successfully achieved by using carbon nanofibers (CNFs) as templates. Field emission scanning electron microscopy (FE-SEM), coupled with X-ray diffraction (XRD) analysis confirmed the template effect and formation of the perovskite-type oxides on the macroscopic substrate. It turned out that this facile method can ensure the desired single-phase perovskite-type oxides formation by controlling the corresponding metal ratio during the preparation procedure. In addition, the immobilized nanofibrous La_(1-x)Ce_xCoO_3 (x = 0.05) and LaMn_xCo_(1-x)O_3 (x = 0.5) perovskite-type oxides can greatly decrease the combustion temperature of nanosized carbon black particles, which has the high potential application prospects in the treatment of diesel soot particles.