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<p>A series of perovskite-type LaMnO<sub>3</sub> (LMO) electrocatalysts (LMO-4, LMO-6, and LMO-8) with different oxygen contents (δ) has been successfully prepared by regulating the sintering temperature and time under nitrogen vs. air atmosphere sintered sample (LMO-0). We investigated the effects of microstructural features such as oxygen vacancies, adsorbed oxygen (O<sub>ads</sub>), δ value, Mn<sup>3+</sup>/Mn<sup>4+</sup> ratio, and Mn-O bond lengths on their magnetic performance and oxygen evolution reaction (OER) activity and its intrinsic correlation mechanism. The nitrogen induces crystal structure transition from tripartite phase (LMO-0) to orthorhombic phase and increases the adsorbed oxygen (O<sub>ads</sub>) content with the variation of annealing conditions. LMO-0 with a high δ-value and high Mn<sup>4+</sup> ratio exhibits a predominantly Mn<sup>3+</sup>-O-Mn<sup>4+</sup> ferromagnetic double-exchange interaction. Among the samples, LMO-0 exhibits the optimal OER activity with the lowest apparent kinetic slope and charge transfer resistance, which is attributed to its highest Mn<sup>4+</sup> ratio, oxygen vacancy content, and most significant electrochemically active area.</p>

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Microstructure-dependent magnetic property and oxygen evolution activity in LaMnO3+δ electrocatalysts

  • 期刊论文

  • 发表日期：

    2026年6月24日

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  • Houming Shen,
  • Chendong Shao,
  • Qirui Wu,
  • Yikai Sun,
  • Sheikh Tamjidur Rahman,
  • Geming Wang,
  • Peng Fan

摘要

A series of perovskite-type LaMnO3 (LMO) electrocatalysts (LMO-4, LMO-6, and LMO-8) with different oxygen contents (δ) has been successfully prepared by regulating the sintering temperature and time under nitrogen vs. air atmosphere sintered sample (LMO-0). We investigated the effects of microstructural features such as oxygen vacancies, adsorbed oxygen (Oads), δ value, Mn3+/Mn4+ ratio, and Mn-O bond lengths on their magnetic performance and oxygen evolution reaction (OER) activity and its intrinsic correlation mechanism. The nitrogen induces crystal structure transition from tripartite phase (LMO-0) to orthorhombic phase and increases the adsorbed oxygen (Oads) content with the variation of annealing conditions. LMO-0 with a high δ-value and high Mn4+ ratio exhibits a predominantly Mn3+-O-Mn4+ ferromagnetic double-exchange interaction. Among the samples, LMO-0 exhibits the optimal OER activity with the lowest apparent kinetic slope and charge transfer resistance, which is attributed to its highest Mn4+ ratio, oxygen vacancy content, and most significant electrochemically active area.