A series of perovskite-type manganites AMnO3 (A = Sr, La, Ca and Y) particles were investigated as electrocatalysts for the oxygen reduction reaction. AMnO3 materials were synthesized by means of an ionic-liquid method, yielding phase pure particles at different temperatures. Depending on the calcination temperature, particles with mean diameter between 20 and 150 nm were obtained. Bulk versus surface composition and structure are probed by X-ray photoelectron spectroscopy and extended X-ray absorption fine structure. Electrochemical studies were performed on composite carbon-oxide electrodes in alkaline environment. The electrocatalytic activity is discussed in terms of the effective Mn oxidation state, A:Mn particle surface ratio and the Mn-O distances.

中文翻译：

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AMnO3（A = Sr、La、Ca、Y）钙钛矿氧化物作为氧还原电催化剂。

研究了一系列钙钛矿型锰酸盐 AMnO3（A = Sr、La、Ca 和 Y）颗粒作为氧还原反应的电催化剂。采用离子液体法合成AMnO3材料，在不同温度下得到相纯颗粒。根据煅烧温度，获得平均直径在 20 至 150 nm 之间的颗粒。通过 X 射线光电子能谱和扩展 X 射线吸收精细结构来探测本体与表面的组成和结构。在碱性环境中对复合碳氧化物电极进行电化学研究。电催化活性根据有效 Mn 氧化态、A:Mn 颗粒表面比和 Mn-O 距离进行讨论。