Efficient and durable bifunctional oxygen electrocatalysts are critical for advanced rechargeable zinc-air (Zn-air) batteries. However, the obstacle to the development of bifunctional electrocatalysts for the oxygen reduction reaction (ORR)/oxygen evolution reaction (OER) lies in the different requirements of the ORR and OER for catalytic materials. Herein, La 0.75Sr 0.25Mn 0.5X 0.5O 3 (X = Co, Ni, and Fe) perovskite nanoparticles were created by rationally screening targeted ORR/OER components and precisely controlling their electronic structures to achieve bifunctional oxygen electrocatalysis, in which La 0.75Sr 0.25Mn 0.5Fe 0.5O 3 (LSFMO) displayed superior ORR performance (E onset of 0.932 V and n of 3.59) and significantly enhanced electrocatalytic activity in the OER process (an E j=10 of 1.658 V and overpotential of 428 mV), corresponding to excellent bifunctional properties (ΔE = 0.94 V). Furthermore, density functional theory (DFT) calculations demonstrated that Mn and Fe dual sites generated by partial substitution had a significant synergistic effect on the electrocatalytic process. The rechargeable Zn-air batteries delivered an unprecedented small charge-discharge voltage polarization (0.76 V), high reversibility and stability over many charge-discharge cycles (60 h). These excellent results demonstrate that Mn-based perovskites with Fe doping are undoubtedly promising bifunctional electrocatalysts for rechargeable Zn-air batteries. [Figure not available: see fulltext.].
Bibliographical noteFunding Information:
This work was financially supported by the Earth Engineering Center and Center for Advanced Materials for Energy and Environment at Columbia University, the School of Chemical Engineering, Northwest University, the National Natural Science Foundation of China (11872302), and the Natural Science Project of Shaanxi Provincial Department of Education (20JK0927).
© 2022, Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature.
- B-site substitution
- density functional theory
- oxygen evolution reaction
- oxygen reduction reaction
- rechargeable Zn-air battery