能源短缺和环境污染问题是当今世界面临的两大难题，近年来风能、水能、太阳能等清洁能源的发展一定程度缓解了能源和环境问题，但这些能源不能稳定持续地输出电能所以不能直接将其产生的电能输入电网，电化学能量转换装置应运而生。固体氧化物燃料电池、锌-空气燃料电池等能量转换装置中OER（氧析出）反应是一个重要的半反应。但OER过高的过电位一直制约着燃料电池的商业化应用和发展，所以研究相应的电催化剂尤为重要。现阶段比较成熟的OER电催化剂是RuO2和IrO2，但是稀有金属价格昂贵不利于商业化，所以广大研究这一直在寻找廉价、高效的非贵金属电催化剂。其中，钙钛矿型电催化剂近几年被广泛研究。
SrNb0.1Co0.7Fe0.2O3-δ被证实是一个高效的OER催化剂，但对其进一步的研究不多，引入A位离子缺陷是一种提高钙钛矿型电催化剂催化性能的一种简单有效的方法，所以本文重点研究了SrxNb0.1Co0.7Fe0.2O3－δ（x=0.90，0.95,0.98和1.0）钙钛矿氧化物作为固体氧化物燃料电池阴极催化材料的情况，讨论了其A位阳离子缺陷对于氧气析出反应电催化性能和稳定性的影响。本文通过固相法制备SrxNb0.1Co0.7Fe0.2O3－δ（x=0.90，0.95,0.98和1.0）粉体催化剂，并通过XRD、CV、LSV和电化学阻抗分析以及进一步的Tafel和MA、ECSA和稳定性分析来研究其电化学性能。研究表明所有粉体均已烧结成纯相；Sr0.98NCF达到电流密度为10mAcm-2所需过电位最小，Tafel斜率也最小为75.36mVdec-1，意味着更快的OER速率和更好的电荷转移能力；进一步比较催化剂的MA、ECSA和AC图可以看出Sr0.98NCF和Sr0.95NCF的电催化性能较好，而Sr0.90NCF和SNCF则较差。500次循环后的结果显示S0.90NCF稳定性最好，S0.95NCF稳定性最差。
关键词 钙钛矿型金属氧化物 A位阳离子 电催化性能 稳定性 固相法
毕业设计说明书外文摘要
Title Preparation and Performance of Perovskite Oxide Electrocatalyst
Abstract：Energy shortage and environmental pollution problems are the two major problems the world facing today. In recent years, the development of clean energy such as wind energy, water energy and solar energy has alleviated the energy and environmental problems to a certain extent. However, these energy sources can not output energy continuously and sustainably so they can not directly generate the power generated by the power grid, electrochemical energy conversion device came into being. OER (oxygen precipitation) reaction in these energy conversion device，such as solid oxide fuel cells, zinc-air fuel cells and other energy conversion devices，is an important half-reaction. But high over-potential in OER has been restricting the commercialization and development of fuel cells, so the study of the corresponding
electrocatalyst is particularly important. At this stage RuO2 and IrO2 is more mature OER electrocatalyst, But the price of rare metals is not conducive to commercialization，so the majority of research has been looking for cheap, efficient non-precious metal electrocatalyst.
Among them, the perovskite-type electrocatalyst has been extensively studied in recent years.
SrNb0.1Co0.7Fe0.2O3-δ has been proved to be an efficient OER catalyst, but there is no much further research. The introduction of A-site ion defect is a simple and effective method to improve the catalytic performance of perovskite-type electrocatalyst. Therefore this paper focuses on the case of SrxNb0.1Co0.7Fe0.2O3-δ(X = 0.90,0.95,0.98 and 1.0) perovskite oxide as the cathode catalytic material for solid oxide fuel cell, and discusses the effect of the defects at the A-site cation on the electrocatalyst performance and stability. In this paper, SrxNb0.1Co0.7 Fe0.2O3-δ(x=0.90,0.98,1.0 and 1.05) powder catalysts were prepared by solid phase method and analyzed by XRD, CV, LSV and electrochemical impedance analysis, as well as further Tafel and MA , ECSA and stability analysis to study its electrochemical performance. The results show that all powders have been sintered into pure phase.Sr0.98NCF achieves a current density of 10 mA cm-2 and a minimum Tafel slope of 75.36 mV dec-1,which means a faster OER rate and better charge transfer capability. The results show that the electrocatalytic performance of Sr0.98NCF and Sr0.95NCF is better than that of Sr0.90NCF and SNCF by further comparing the 钙钛矿型氧化物电催化剂的制备与性能研究:http://www.youerw.com/huaxue/lunwen_205044.html