Keywords
Microstructure
Magnetic properties
Oxygen evolution reaction
Submitted : 2024-05-21
Accepted : 2024-06-05
Published : 2024-06-20
Abstract
In this paper, a series of LaMnO3+δ (LMOs) were successfully prepared by adjusting the sintering temperature using the sol-gel method with ABO3-type LMO oxides as the object of study. The results showed that with the increase of sintering temperature, the Oads, oxygen vacancies, and Mn4+ content in the system gradually decreased, and the oxygen evolution reaction (OER) was subsequently weakened. Although the suitable Mn3+/Mn4+ valence ratio (2.15:1) of the LMO700 sample created a strong ferromagnetic double-exchange effect, the high concentration of oxygen vacancies in LMO700 disturbed this effect and weakened its macro magnetism. This paper serves to contribute to the design and development of new magnetic perovskite electrocatalysts.
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