炭载Ir金属催化剂的制备及其对氨氧化的电催化性能  

Preparation and Electrocatalystic Performance of Ir/C Catalyst for Ammonia Oxidation

作　　者：孔庆梅[1] 韩益苹[1] 邓玲娟[2] 陆天虹[1,3] 唐亚文[1] 

机构地区：[1]南京师范大学化学与环境科学学院,江苏南京210097 [2]咸阳市咸阳师范学院化学系,陕西咸阳712000 [3]中国科学院长春应用化学研究所,吉林长春130022

出　　处：《电化学》2008年第4期378-382,共5页Journal of Electrochemistry

基　　金：上海RAE工程技术中心传感器研发部资助

摘　　要：利用乙醇-水二元体系制备含质量分数为30%Ir的碳载Ir(Ir/C)催化剂.X射线衍射(XRD)谱和电化学测试分别表明,该催化剂Ir粒子的平均粒径约为2.2 nm.在NaC lO4电解液中,Ir/C催化剂对氨氧化的电催化活性与纯Ir催化剂的相似,但稳定性有明显增加.同时,NH3氧化的电流密度与NH3浓度呈现良好的线性关系,有望在定电位电解型NH3传感器中得到应用.The Ir/C catalyst with 30% （ by mass） Ir was prepared in the CH3CH2OH and H2O binary system. The X-ray diffraction （XRD） data showed that the average sizes of the Ir particles in the Ir/C catalyst was about 2.2 nm. The results of the electrochemical measurements indicated that the eleetrocatalytic activity of the Ir/C catalyst for the ammonia oxidation in the neutral NaClO4 solution was similar to the Ir catalyst, while electroeatalytic stability was much better than that of the Ir catalyst. Furthermore, the peak current density of the ammonia oxidation at the Ir/C catalyst electrode showed a good linear relationship with the ammonia concentration, illustrating that the Ir/C catalyst would have a good application prospect in the potential fixed electrolytic type ammonia sensor.

关 键 词：碳载Ir催化剂 氨气氧化 电催化稳定性 

分 类 号：O643.3[理学—物理化学]