开发价格低廉且具有优异催化活性和稳定性的氧催化剂是能源领域亟待解决的难题之一。过渡金属氧化物有望替代贵重金属作为未来的氧催化剂，但是其性能依旧不能满足实际应用的需求。最新研究表明阴离子缺陷工程有望用于提高过渡金属氧化物的氧催化活性，但是至今如何可控的引入阴离子缺陷依旧是一个具有挑战性的难题，关于阴离子缺陷影响材料氧催化活性的机理仍然不清楚。本项目中我们将采用离子辐照调控类钙钛矿相氧化物薄膜模型材料的阴离子缺陷(氧缺陷以及N、F、P、C等阴离子掺杂)，综合运用扫描隧道显微镜/隧穿谱、原位拉曼光谱、原位X射线衍射等材料表征手段和电化学测试方法揭示离子辐照引入的阴离子缺陷对于材料氧催化活性的影响机理，并通过优化离子辐照条件实现高性能氧催化剂的制备。本项目的实施有望扩展离子束技术的在能源领域的应用，所得到的阴离子缺陷对氧催化活性的调控机理可以运用于指导新型氧催化剂的合成，有着重要的理论与应用价值。

The development of cost-effective catalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is crucial for enhancing the energy efficiency of many electrochemical energy conversion and storage devices. Owing to their low cost and high activity, transition metal oxides have attracted much attention as alternative electro-catalysts to replace the currently used noble metal-based catalysts. Anion defects (e.g., oxygen vacancies, interstitials, and anion dopants such as N, F, P C, etc.) can significantly change the electronic structure of oxides or the stability of adsorbed intermediates, thus greatly enhancing the electro catalytic activities of the oxide surface. Anionic defect engineering represents a potential new direction for rational design of high-performance electro-catalysts. In this work, we will study how the ion irradiation impacts the quantity and the type of anion defects in perovskite based oxide thin film model system. Using advanced surface characterization method such as scanning tunneling microscopy and Spectroscopy, in situ Raman and X-ray diffraction, and electrochemical test, we will uncover the correlation between local anion defects that created by ion irradiation and OER/ORR activity. Based on such mechanism understanding, we will apply ion beam irradiation to enhance the catalytic activity of porous electrodes over oxygen reaction. The approach we use and the knowledge we obtain in this project will be applicable to other electro-catalysts, and have potential application in other fields in energy devices.