Optimal Research in Processing of Multi-walled Carbon Nanotubes Composite Pt-Ru Nanoparticles for Fuel Cell Electrode Materials

• Main Authors: Ya- Peng Cheng, 程亞鵬
• Other Authors: Kun- Yauh Shih
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/32997486777065291575

碩士 === 國立屏東教育大學 === 化學生物系 === 99 === The main purpose of this study was to consider optimal research in pocessing of Multi-walled Carbon Nanotubes composite Pt-Ru nanoparticles for Fuel Cell electrode materials. The corresponding experiment performed to achieve this purpose is divided into three parts: The first part involves purification and carboxylation of MWCNTs; thermal gravimetric analysis (TGA) measurements show that a large number of purified MWCNTs can remove impurities. After nitric acid is produced as a result of the carboxylation of MWCNTs, the cyclic voltammetry (CV) current density is not measured 2 times carboxylation. Fourier transform infrared spectroscopy (FT-IR) revealed that -COOH is produced on the surface of the MWCNTs and that the carboxylic procedures reduce the surface inertia of MWCNTs and endow them with better dissolution and dispersion properties. In the second part of the experiment, ethylene glycol is prepared by chemical reduction using Pt-Ru catalyst material, and X-ray powder diffraction (XRD) is used to determine the crystal structure of the catalyst Pt-Ru alloy. Different proportions of Pt-Ru alloy catalyst are coated on to the MWCNTs to determine significant differences in the dispersion by the catalysts. Transmission electron microscopy (TEM) was used to study the surface dispersion of the Pt-Ru catalysts on MWCNTs to determine the minimum amount of catalyst required. The results show that when the proportion of the Pt-Ru alloy catalyst was increased to 65% and deposited on the MWCNTs and 55% of the amount of platinum ruthenium alloy catalysts and almost the same. The maximum load capacity of the Pt-Ru alloy catalysts on the MWCNTs was found to be 45–55%. In the third part of the experiment, different proportions of Pt-Ru alloy catalyst precursor were deposited on to the MWCNTs by carboxylation and under a reflux heating time of 3 h and a reduction temperature of 130 °C to restore stability. This was done in order to prepare the Pt-Ru alloy catalyst layers deposited on the MWCNTs. The current density generated by 55% Pt-Ru/MWCNT for the catalytic reaction of methanol oxidation yielded the best current density of 65.4 mA/cm2. Further, different carrier compounds were explored for use with Pt-Ru alloy catalysts. The results showed that 55% Pt-Ru alloy catalysts deposited on MWCNTs catalytic methanol oxidation current density than 55% Pt-Ru/MWCNT/carbon black, 55% Pt-Ru/carbon black good.