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 electrocatalytic activity of the Ir/C catalyst for the ammonia oxidation in the neutral NaClO4 solution was similar to the Ir catalyst,while electrocatalytic 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.