Celorrio V, Calvillo L, Granozzi G, Russell A E, Fermin D J
1School of Chemistry, University of Bristol, Cantocks Close, Bristol, BS8 1TS UK.
2Dipartimento di Scienze Chimiche, Università di Padova, Via Marzolo 1, 35131 Padua, Italy.
Top Catal. 2018;61(3):154-161. doi: 10.1007/s11244-018-0886-5. Epub 2018 Jan 16.
A series of perovskite-type manganites AMnO (A = Sr, La, Ca and Y) particles were investigated as electrocatalysts for the oxygen reduction reaction. AMnO 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.
研究了一系列钙钛矿型锰氧化物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了AMnO₃材料，在不同温度下得到了纯相颗粒。根据煅烧温度，获得了平均直径在20至150纳米之间的颗粒。通过X射线光电子能谱和扩展X射线吸收精细结构探测体相与表面的组成和结构。在碱性环境中的复合碳氧化物电极上进行了电化学研究。根据有效锰氧化态、A:Mn颗粒表面比和Mn - O距离对电催化活性进行了讨论。
