A Hight Performance Hydrogen Sensor Based on Ternary PtPdRu Electrocatalysts

• Main Authors: Jin-Cheng Wang, 王錦成
• Other Authors: Yu-Ching Weng
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/62526344839449523060

碩士 === 逢甲大學 === 化學工程學所 === 99 === A novel amperometric sensor for hydrogen determination by using the ternary Pt1Pd3Ru1/C/Nafion and Pt2.2Pd1.7Ru1.0/C/Nafion as sensing electrodes been developed in this study. The ternary PtPdRu alloy electrocatalysts were prepared by chemical reduction method on the black carbon (XC-72). Energy-dispersive X-ray (EDX), thermogravimetric analyzer (TGA), trasmission electron microscope (TEM), BET surface area analysis (BET) and potentiostat were used to characterize and evaluate the sensing performances of the alloy electrocatalysts. The average particle size of the best alloy electrocatalysts is 4.78 nm. The alloy loading and specific surface area of electrocatalysts were about 80 wt.% and 108.63 cm2/mg, respectively. To evaluate the sensing performances of the sensor, the Pt1Pd3Ru1/C/Nafion and Pt2.2Pd1.7Ru1.0/C/Nafion were used as working electrodes. The results showed that the optimum response current was obtained at hydrogen gas flow rate of 300 sccm. When the potential of 0.6 V (vs. Ag/AgCl (NaCl 3 M)) was applied on the working electrode, a linear relationship between response current and hydrogen concentration was observed in the detection range from 100 to 1000 ppm. The Pt1Pd3Ru1/C/Nafion electrode possessed a better sensitivity of 1.28 uA/ ppm cm2 than that of the Pt2.2Pd1.7Ru1.0/C/Nafion electrode. The response time and the recovery time of the Pt1Pd3Ru1/C/Nafion electrode were in the range of 91 - 40 s and 69 - 20 s. This electrode also exhibited good selectivity toward hydrogen than CO、SO2、NO and NO2.