One-Dimensional Self-Assembled Heterostructured Perovskite Hybrid for Oxygen Reduction and Zn-Air Batteries

Active electrocatalysts are essential for the oxygen reduction reaction (ORR), which plays a crucial role in functionalizing sustainable fuel cells and Zn-air batteries (ZABs). Herein, a nominal perovskite (LaBa0.85Ca0.15Mn2O5+a) hybrid consisting of single cubic and hexagonal perovskite structures was synthesized by electrospinning. The obtained carbon-supported one-dimensional heterostructured perovskite hybrid (1D-HPH/C) exhibits high onset and half-wave potentials of 0.879 and 0.740 V vs RHE and a high limiting current density of 6.17 mA cm-2 at 1600 rpm, which are superior to those of powder HPH/C and close to Pt/C. 1D-HPH combines the advantages of high specific surface area (14.4 m2 g-1) and optimized intrinsic activity (eg = 1), thus exhibiting outstanding electrocatalytic activity for ORR. This work demonstrates the importance of adjusting microstructure and forming a two-phase heterostructure for promoting electrocatalytic reactions of perovskite electrocatalysts.

Automated summary

A one-dimensional hybrid perovskite material with excellent electrocatalytic activity for the oxygen reduction reaction (ORR) was synthesized by electrospinning. It exhibited high onset and half-wave potentials, close to those of platinum catalyst, demonstrating the importance of microstructure adjustment for promoting electrocatalytic reactions of perovskite electrocatalysts.