热处理对FeN/C催化剂氧还原性能的影响  

Effect of pyrolysis on performance of FeN/C catalyst for oxygen reduction reaction

作　　者：郑秋燕 沈亚云[1] 杨智[1] 秦好丽[1] 田娟[1] ZHENG Qiuyan;SHEN Yayun;YANG Zhi;QIN Haoli;TIAN Juan(School of Chemistry and Materials Science, Guizhou Normal University, Guiyang 550001, China)

机构地区：[1]贵州师范大学化学与材料科学学院

出　　处：《功能材料》2019年第12期12142-12147,共6页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(21506041);贵州省科学技术基金资助项目(黔科合JZ字[2015]2007号);贵州省普通本科高等学校科技拔尖人才支持资助项目(黔教合KY字[2016]063)

摘　　要：高活性、低沉本的阴极氧还原催化剂是目前质子交换膜燃料电池的重要研究内容之一。考察了FeN/C作为氧还原催化剂的催化性能,研究氨气气氛下的二次热处理对催化剂氧还原催化活性与稳定性的影响。使用X射线衍射、比表面积和孔径分布测试、透射电子显微镜等方法对催化剂的结构进行表征,使用线性扫描伏安法对催化剂的氧还原活性进行测试。结果表明,经二次热处理后,催化剂表现出更好的氧还原催化活性及稳定性。催化剂在二次热处理后,具有更高的比表面积(931.2 m^2/g)、较高的表面氮含量(1.67%(原子分数))、以及催化剂中存在的Fe3C,是其催化性能提高的可能原因。Low-cost catalysts with high activity and acceptable stability toward oxygen reduction reaction (ORR) attract much interest and attention in recent years. In this work, FeN/C catalysts for ORR were synthesized via impregnation with different pyrolysis process. The effects of secondary pyrolysis in ammonia on catalysts structure and performance were investigated by various techniques, such as X-ray diffraction, N2-adsorption porosimetry, transmission electron microscope and electrochemical characterization. The catalyst underwent secondary pyrolysis showed obvious improved ORR activity and stability compared to the catalyst underwent one pyrolysis in argon. This was attributed to the catalyst underwent secondary pyrolysis had higher BET surface area (931.2 m^2/g) and surface nitrogen content (1.67 at.%), as well as the existence of Fe3C.

关 键 词：质子交换膜燃料电池 氧还原反应 FeN/C催化剂 热处理 活性 稳定性 

分 类 号：O643[理学—物理化学]