(560cd) Reutilization of Ba0.75Sr0.25CoNdO6-? for Oxygen Reduction Reaction in Alkaline

Perovskite-type oxides (PO) have a wide range of applications in catalytic reactions and photoelectric conversion. Accordingly, a large amount of PO waste is inevitably generated. The effective reutilization of PO waste is of great significance to energy and environment, etc. In this work, we report a novel high activity Ba_0.75Sr_0.25CoNdO_6-θ (BSCN) catalyst for oxygen reduction (ORR) based on nitrogen-doped carbon (CN). BSCN/CN is prepared by high temperature annealing of low-cost industrial material melamine (as the carbon nitrogen precursor) and BSCN. This facile approach can simultaneously achieve carbonization and heteroatom doping in the synthesis process. The high-resolution N1s spectrum shows that the pyridine-like nitrogen atoms content which promotes the oxygen reduction reaction (ORR) of 0.2g-BSCN/CN (0.2g is the mass of BSCN) reaches 30.49%. Electrochemical characterizations obviously demonstrate that 0.2g-BSCN/CN exhibits excellent catalytic performance and stability in 0.1 mol^.L^-1 KOH. Notably, its onset potential (E_onset) reaches 0.9V, half-wave potential (ΔE_1/2) achieves 0.75V, and limiting current density (J_L) accomplishes -5.76 mA^.cm^-2, which significantly exceed the BSCN catalyst. The enhancement of catalytic performance can be attributed to the fact that the incorporation of the pyridine-type nitrogen atoms into the carbon material increases the molecular oxygen absorption capacity of the catalyst. Besides, the electron flows between the BSCN and the nitrogen-doped carbon likely promote the catalytic activity.