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Carbon-coating functionalized La0.6Sr1.4MnO4+delta layered perovskite oxide: enhanced catalytic activity for the oxygen reduction reaction

机译:碳涂层功能化的La0.6Sr1.4MnO4 +δ层钙钛矿氧化物:增强的催化活性,用于氧还原反应

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摘要

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+delta 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+delta exhibits better catalytic activity for the ORR. For the carbon-coated La0.6Sr1.4MnO4+delta, 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.
机译:用于氧还原反应(ORR)的高效电催化剂是影响锂氧电池性能的关键因素。在这项研究中,制备了La0.6Sr1.4MnO4 +δ层状钙钛矿氧化物作为ORR的高活性电催化剂,并成功引入了厚度<5 nm的碳涂层来增强AsR的电子导电性。准备好的氧化物。进行了XRD,XPS,拉曼,SEM和TEM测量,以表征这些样品的晶体结构和形态。旋转环盘电极(RRDE)技术已被用于研究所制备的催化剂在0.1 M KOH介质中对ORR的催化活性。 RRDE结果表明,碳包覆的La0.6Sr1.4MnO4 +δ对ORR表现出更好的催化活性。对于碳包覆的La0.6Sr1.4MnO4 +δ,ORR主要通过直接四电子过程进行,并且在2500 rpm下获得的最大阴极电流密度为6.70 mA cm(-2),与该值接近在相同的测试条件下制备商用Pt / C电催化剂。

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