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Manganese oxides/LaMnO3 perovskite materials and their application in the oxygen reduction reaction

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  • Flores-Lasluisa, J.X.
  • Huerta, F.
  • Cazorla-Amorós, D.
  • Morallón, E.

Abstract

Manganese-based materials can catalyze the oxygen reduction reaction (ORR), although their activity is known to depend on the crystalline phases and on the concentration of surface-active species. In the present study, we have optimized these two parameters to obtain improved catalysts for ORR. A sol-gel method was used to synthesize LaMnO3-manganese oxides composites with different lanthanum-to-manganese atomic ratios. The synthesized materials, which can be described as La1-xMnOz, were tested under ORR conditions and characterized by several physicochemical techniques such as SEM, XPS, EDX or XRD. It was found that the concentration of lanthanum governs the formation of different crystal phases and determines the crystallite size. Besides, high values of x tend to increase the surface concentration of manganese and therefore to produce more active sites for ORR. Among the materials analysed, La0.6MnOz mixed with carbon black (Vulcan) showed the best electrocatalytic performance. The high tolerance to methanol makes this electrocatalyst a promising alternative to substitute Pt-based materials in alkaline electrolytes.

Suggested Citation

  • Flores-Lasluisa, J.X. & Huerta, F. & Cazorla-Amorós, D. & Morallón, E., 2022. "Manganese oxides/LaMnO3 perovskite materials and their application in the oxygen reduction reaction," Energy, Elsevier, vol. 247(C).
    • Handle: RePEc:eee:energy:v:247:y:2022:i:c:s0360544222003590
    DOI: 10.1016/j.energy.2022.123456
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    Cited by:

    1. Ding, Haoran & Tong, Sirui & Qi, Zhifu & Liu, Fei & Sun, Shien & Han, Long, 2023. "Syngas production from chemical-looping steam methane reforming: The effect of channel geometry on BaCoO3/CeO2 monolithic oxygen carriers," Energy, Elsevier, vol. 263(PE).
    2. Shen, Qiuwan & Shao, Zicheng & Li, Shian & Yang, Guogang & Sunden, Bengt, 2023. "Effects of B-site Al doping on microstructure characteristics and hydrogen production performance of novel LaNixAl1-xO3-δ perovskite in methanol steam reforming," Energy, Elsevier, vol. 268(C).
    3. Flores-Lasluisa, J.X. & Huerta, F. & Cazorla-Amorós, D. & Morallón, E., 2023. "LaNi1-xCoxO3 perovskites for application in electrochemical reactions involving molecular oxygen," Energy, Elsevier, vol. 273(C).

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