Study on the Preparation, the Magnetic Performance, and the Oxygen Evolution Reaction of LaMnO3+δ

¹ Wuhan NARI Limited Liability Company, State Grid Electric Power Research Institute, NARI Group (State Grid Electric Power Research Institute) Co., Ltd., Wuhan 430074, Hubei Province, China,

² Provincial Key Laboratory of Plasma Chemistry and Advanced Materials, Wuhan Institute of Technology, Wuhan 430073, Hubei Province, China,

JERA 2024 , 8(3), 97–103; https://doi.org/10.26689/jera.v8i3.7212

© 2024 by the Authors. Licensee Whioce Publishing, Singapore. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution 4.0 International License ( https://creativecommons.org/licenses/by/4.0/ )

Abstract

In this paper, a series of LaMnO_3+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 O_ads, 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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