Ir/CNTs催化剂的制备及对氨的电催化氧化  

Preparation of Ir/CNTs Catalyst and Its Electrocatalytic Performance for Ammonia Oxidation

作　　者：孔庆梅[1] 蒋玉芝[1] 陈冲[1] 周益明[1] 陆天虹[1] 陈煜[1] 唐亚文[1,2] 

机构地区：[1]南京师范大学化学与材料科学学院,江苏省新型动力电池重点实验室,南京210046 [2]南京理工大学材料化学实验室,南京210094

出　　处：《高等学校化学学报》2010年第11期2260-2263,共4页Chemical Journal of Chinese Universities

基　　金：国家“八六三”计划项目(批准号:2006AA05Z137,2007AA05Z143,2007AA05Z159);国家自然科学基金(批准号:20873065)资助

摘　　要：分别以碳纳米管(CNTs)和XC-72活性碳为载体制备了Ir/CNTs和Ir/C催化剂.X射线衍射(XRD)结果显示,CNTs拥有更高的石墨化程度.电化学研究结果表明,与Ir/C催化剂相比,Ir/CNTs对氨氧化具有更高的电流密度、更低的起始氧化电位和更好的稳定性.同时,Ir/CNTs催化剂对氨检测的线性范围更宽,灵敏度更高,检出限更低.Ir/CNTs and Ir/C catalysts were prepared with multi-wall carbon nanotubes（ CNTs） and Vulcan XC-72 activated carbon （ XC-72 ） as supporting carbon material,respectively. X-ray diffraction （ XRD） measurements show the graphitization degree of CNTs is higher than that of XC-72,which indicates that CNTs possesses higher electron conductivity than that of XC-72. In comparison to Ir/C catalyst,the Ir/CNTs catalyst has higher oxidation current,lower onset oxidation potential and better stability for ammonia electro-oxidation. During the electrochemical detection of ammonia,the Ir/CNTs catalyst modified electrode possesses a lower detection-limit,a wider linear range of detection and a higher sensitivity compared to Ir/C catalyst. Thus, CNTs may be an ideal catalyst supporting material for the practical application of amperometric NH3 sensor.

关 键 词：氨气氧化 电催化活性 碳纳米管 铱 传感器 

分 类 号：O646[理学—物理化学]