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中文摘要：
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.
英文摘要：
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.
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