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.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
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
关键词
氨气氧化
电催化活性
碳纳米管
铱
传感器
Ammonia oxidation
Electrocatalytic activity
Carbon nanotube
Ir
Sensor
