Effect of interfering gases on the reactivity of PtxPdyRuz catalysts toward hydrogen oxidation measured by scanning electrochemical microscopy

• Main Authors: Kuo-an Hsiung, 熊國安
• Other Authors: Yu-ching Weng
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/35507538105863947181

碩士 === 逢甲大學 === 化學工程學所 === 99 === In this study, using scanning electrochemical microscopy (SECM) to screen the best of anti-poison of the multi-component electrocatalyst of the platinum-palladium- ruthenium alloy catalyst array. The multi-alloy catalyst array was made on a very small substrate by combinatorial method. The morphology, the structures and compositions of the alloy were determined by scanning electron microscopy (SEM), electron dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD), respectively. Combined with scanning electrochemical microscopy would be applied to systematically and rapidly identify the best anti-poison of the multi-component electrocatalysts in each interference gas. We can use tip generation-substrate collect (TG-SC) mode to screen electrocatalysts. In the CO interference, Pt3Pd1Ru1, Pt2Pd2Ru1, Pt3Ru2 had better catalytic activity. In the NO interference, Pt3Pd1Ru1, Pt3Ru2 had better catalytic activity. In the NO2 interference, Pt2Pd2Ru1 has the best catalytic activity. In the SO2 interference, Pt1Pd3Ru1 has the best catalytic activity. The catalytic activity of the better multi-component alloys reduced in the interference gases by tip-substrate voltammogram method. These multi-component alloys are Heyrovsky-Volmer mechanism by using approach curve experiment, and k0 values are between 0.17 and 0.29.