La_0.8Sr_0.2MnO₃ (LSM) catalyst is prepared via a sol-gel method and modified via a typical silver mirror reaction. Silver ammonia solution is reduced in a polyvinylpyrrolidone (PVP)-containing solution to obtain silver nanoparticles and sodium dodecyl sulfate (SDS) is added as a surfactant. The microstructure and morphology of the LSM-Ag composite powder are characterized. According to the results, the Ag particles precipitate on the LSM surface in elemental form and the grain size is about one hundred nanometers. The analysis of electrocatalytic performance of LSM-Ag cathodes with different amounts of silver loading reveals that the number of electrons transferred during the oxygen reduction reaction (ORR) of the cathode with an Ag content of 14% by weight reached 3.9, which is very close to that of commercial Pt/C catalysts. Similarly, the maximum power density of the air battery made of LSM-14%Ag is 73 mW/cm², which exceeds that of 63 mW/cm², found for the LSM battery. Finally, increasing the amount of silver loading allows one to improve the electrochemical performance of LSM catalysts. The best effect is achieved when the Ag loading exceeds 14%.

中文翻译：

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Ag-La0.8Sr0.2MnO3（LSM-Ag）复合粉末的合成及其在镁空气电池中的应用

La _0.8 Sr _0.2 MnO ₃（LSM）催化剂是通过溶胶-凝胶法制备的，并通过典型的银镜反应进行改性。在含聚乙烯吡咯烷酮（PVP）的溶液中还原氨银溶液以获得银纳米颗粒，并添加十二烷基硫酸钠（SDS）作为表面活性剂。对LSM-Ag复合粉末的微观结构和形貌进行了表征。根据结果​​，Ag颗粒以元素形式沉淀在LSM表面上，并且晶粒尺寸为约一百纳米。对具有不同银负载量的LSM-Ag阴极的电催化性能的分析表明，在含氧量为14％（重量）的阴极的氧还原反应（ORR）期间转移的电子数量达到3.9，这非常接近与市售Pt / C催化剂相比 相似地，²，超过了LSM电池的63 mW / cm ²。最后，增加银负载量可以改善LSM催化剂的电化学性能。当载银量超过14％时，可获得最佳效果。