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<p>Strontium-doped lanthanum manganite perovskites are widely regarded as benchmark cathode materials for metal-air batteries owing to their excellent thermochemical stability. However, their low-temperature oxygen reduction reaction (ORR) activity is often limited by surface Sr segregation and an insufficient density of active sites. Herein, we report a glucose-assisted sol-gel strategy to effectively modulate the surface electronic structure of La<sub>0.7</sub>Sr<sub>0.3</sub>MnO<sub>3</sub> (LSMO). Electrochemical measurements demonstrate that the catalyst prepared with 20 wt% glucose (LSMO-20) exhibits optimal ORR performance, delivering a limiting diffusion current density of 5.36&#xa0;mA cm<sup>-2</sup>, which markedly exceeds that of pristine LSMO (4.68&#xa0;mA cm<sup>–2</sup>). Kinetic analyses reveal that LSMO-20 possesses the appropriate Tafel slope and an almost ideal electron transfer number (<i>n</i> = 3.98), indicating a highly efficient four-electron ORR pathway. X-ray photoelectron spectroscopy further confirms that glucose incorporation not only effectively suppresses the segregation of insulating surface Sr species, reducing the surface-to-lattice Sr ratio from 1.06 to 0.82, but also regulates the surface Mn valence by enriching Mn<sup>3+</sup> species and promotes the formation of oxygen vacancies, yielding an elevated O<sub>ads</sub>/O<sub>lat</sub> ratio of 1.62. These findings demonstrate that tuning surface chemical states through organic additives offers an effective and scalable approach for designing high-performance perovskite electrocatalysts.</p> Graphical Abstract <p></p>

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The Preparation of La0.7Sr0.3MnO3 Toward Enhanced Oxygen Reduction Reaction Activity via Glucose-Assisted Sol-Gel Strategy

  • 期刊论文

  • 发表日期：

    2026年4月2日

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  • Fei Dong,
  • Yuhao Cui,
  • Enhui Wu,
  • Sheng Xu,
  • Shengfang Shi

摘要

Strontium-doped lanthanum manganite perovskites are widely regarded as benchmark cathode materials for metal-air batteries owing to their excellent thermochemical stability. However, their low-temperature oxygen reduction reaction (ORR) activity is often limited by surface Sr segregation and an insufficient density of active sites. Herein, we report a glucose-assisted sol-gel strategy to effectively modulate the surface electronic structure of La0.7Sr0.3MnO3 (LSMO). Electrochemical measurements demonstrate that the catalyst prepared with 20 wt% glucose (LSMO-20) exhibits optimal ORR performance, delivering a limiting diffusion current density of 5.36 mA cm-2, which markedly exceeds that of pristine LSMO (4.68 mA cm–2). Kinetic analyses reveal that LSMO-20 possesses the appropriate Tafel slope and an almost ideal electron transfer number (n = 3.98), indicating a highly efficient four-electron ORR pathway. X-ray photoelectron spectroscopy further confirms that glucose incorporation not only effectively suppresses the segregation of insulating surface Sr species, reducing the surface-to-lattice Sr ratio from 1.06 to 0.82, but also regulates the surface Mn valence by enriching Mn3+ species and promotes the formation of oxygen vacancies, yielding an elevated Oads/Olat ratio of 1.62. These findings demonstrate that tuning surface chemical states through organic additives offers an effective and scalable approach for designing high-performance perovskite electrocatalysts.

Graphical Abstract