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中文摘要：
用石墨烯（G）代替Vulcan XC-72炭（XC）作Ir的载体制备石墨烯载Ir（Ir/G）催化剂.电化学的测量结果表明,Ir/G催化剂对氨氧化的电催化性能优于XC炭载Ir（Ir/XC）催化剂.X射线衍射（XRD）谱测量结果表明,Ir/G和Ir/XC催化剂的Ir粒子平均粒径相似.拉曼光谱的测量结果表明,G的石墨化程度和电导率高于XC.因此,Ir/G催化剂对氨氧化的电催化性能优于Ir/XC催化剂.氨在Ir/G催化剂电极上氧化的电流密度与氨浓度呈很好的线性关系曲线,相关系数R为0.99557.因此,Ir/G催化剂电极可作为电流型电化学氨传感器的工作电极.
英文摘要：
Instead Vulcan XC-72 carbon（XC）,grapheme（G） was used as the support to prepare the Ir/G catalyst.The electrochemical measurement indicted that the electrocatalytic performance of the Ir/G catalyst for the ammonia oxidation was better than that of the Ir/XC catalyst.XRD and TEM measurements indicated that the average sizes of Ir particles in Ir/G and Ir/XC catalysts were similar.The measurement of the Raman spectroscopy illustrates the graphitization extent of G is higher than that of XC.Thus,the conductivity of G is higher than that of XC.Therefore,the electrocatalytic performance of the Ir/G catalyst is better than that of the Ir/XC catalyst can be attributed to the high conductivity due to the high graphitization extent of G.The results show that there is the good linear relationship between the current density of the ammonia oxidation at the Ir/G catalyst electrode and the concentration of ammonia.The related coefficient（R） is 0.99557.Thus,Ir/G catalyst electrode can be used as the working electrode in the current type of electrochemical ammonia sensor.
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