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Abstract

Efficient electrocatalysts for the oxygen reduction reaction (ORR) is a critical factor to influence the performance of lithium–oxygen batteries. In this study, La0.6Sr1.4MnO4+δ layered perovskite oxide as a highly active electrocatalyst for the ORR has been prepared, and a carbon-coating layer with thickness <5 nm has been successfully introduced to enhance the electronic conductivity of the as-prepared oxide. XRD, XPS, Raman, SEM and TEM measurements were carried out to characterize the crystalline structure and morphology of these samples. Rotating ring-disk electrode (RRDE) technique has been used to study catalytic activities of the as-prepared catalysts for the ORR in 0.1 M KOH media. RRDE results reveal that carbon-coated La0.6Sr1.4MnO4+δ exhibits better catalytic activity for the ORR. For the carbon-coated La0.6Sr1.4MnO4+δ, the ORR proceeds predominately via a direct four electron process, and a maximum cathodic current density of 6.70 mA cm−2 at 2500 rpm has been obtained, which is close to that of commercial Pt/C electrocatalyst under the same testing conditions.

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©RSC Advances 2015, Royal Society of Chemistry.

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This article was first published by the Royal Society of Chemistry and can be found at http://dx.doi.org/10.1039/C4RA11588K

Wang, Y., Yang, Z., Lu, F., Jin, C., Wu, J., Shen, M., Yang, R., & Chen, F. (2015). Carbon-Coating Functionalized La0.6Sr1.4MnO4+δ Layered Perovskite Oxide: Enhanced catalytic Activity for the Oxygen Reduction Reaction. RSC Advances, 5 (2), 974 – 980. http://dx.doi.org/10.1039/C4RA11588K

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