Investigation of charge-exchange processes in mixed conducting oxides for quantitative low-energy ion scattering (LEIS) analysis

在项目的前几个月，主要重点是开发用于电化学能量转换装置材料定量分析的LEIS分析方法。从这个意义上说，该项目涵盖了2016年的两个工作包：1.确定感兴趣阳离子的灵敏度因子：应用特征速度法对粉末标准物质进行了测试，以估算钙钛矿材料中感兴趣的阳离子的存活概率和灵敏度因子（例如锶、镧、钴和镍）。这种方法也提供了有关的电荷交换过程中的主要离子-原子表面相互作用的信息。研究的主要物种为~ 4 He ~+和~（20）Ne ~+。2.电极材料LEIS分析的验证。作为能量的函数，评估了用于分析两种最先进的电极材料（即La0.6Sr0.4Co0.2Fe0.8O3-和La 2NiO 4+）的主要射弹的中和行为，以确定基质效应的存在。

During the first months of the project the main focus was made on the development of the LEIS analysis methodology for the quantitative analysis of materials used for electrochemical energy conversion devices.In this sense, the project covered the two work-packages described for the year 2016:1.Determination of the sensitivity factors for the cations of interest: The characteristic velocity method was applied on powdered standard materials for the estimation of the survival probability and sensitivity factors of the cations of interest in selected perovskite materials (e.g. Strontium, Lanthanum, Cobalt and Nickel). This methodology also provides information about the charge-exchange processes during the primary ion-atom surface interaction. The primary species studied were 4He+ and 20Ne+.2.Validation of the LEIS analyses on electrode materials. The neutralization behaviour of the primary projectile for the analysis of two state-of-the-art electrode materials (i.e. La0.6Sr0.4Co0.2Fe0.8O3- and La2NiO4+ was evaluated as a function of the energy to identify the presence of matrix effects.