Preparation of Pt Nanocatalyst onto Multi-walled Carbon Nanotubes for Fuel Cell Electrode Materials

• Main Authors: Hong-ji Lin, 林宏奇
• Other Authors: none
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/13126169509536191725

碩士 === 國立屏東教育大學 === 應用化學暨生命科學系 === 97 === The experiment of this research are using the method of heating backflow with the ratio of 3:1, 3:2 of the nitric acid and sulfuric acid for producing and preparing the superficial carboxylic nanometer tube for improving the nature of functional procedures on the surface changing, producing (-COOH) -SO3H on the surface of the nanometer tube, by applying the carboxylic procedures to reduce the surface inertia of nanometer tube and endow with the nanometer tube the better dissolution dispersion nature, so as to increase the utility of the nanometer tube, further more, by using the carboxylic nanometer tube as the carrier of the platinum catalyst for producing and preparing the electrode material of nanometer tube with the platinum catalyst carrier. The electrode catalyst of fuel cell prepared and produced by the aging method of chemical reduction, the analysis of this experiment was conducted by the load capacity of four different of nature changed and unchanged carbon nanometer tubes, the impact to the size of current density from weight ratio of platinum (Pt) catalyst. The results: Nitrate (HNO3)> Sulfuric Acid: Nitric Acid (3:2)> Sulfuric Acid> Sulfuric Acid: Nitric Acid (3:1)> the nature unchanged carbon nanometer tubes. From the effect of coating quantity of Platinum (Pt) catalyst, it was found the battery performance has not been raised in accordance with the increase of catalyst coating amount in equal proportion. The analysis of loading capacity of platinum (Pt) Catalyst, this experiment is conducted with nanometer carbon tubes as the carrier under the reduction condition of 1600C, restoring time is within 3 hours, the accomplished experiment of the reduction of alcoholization to the platinum (Pt) catalyst on carbon carrier will change the weight of platinum (Pt) catalyst in different proportion, and then conduct the analysis on the capacity for the current density size of the carrier load. The conclusion is that the best weight ratio of load carrier on Nitrate carboxylic in nature changed carbon tubes carriers are 10Wt% and there is no absolute connection on the amount of catalyst content with current density scale, the key point is on whether catalyst are dispersed over around, therefore, the efficiency of catalyst decided completely by grain size and the degree of dispersion. The results of this research illustrated that when you use the carboxylic nanometer tubes as catalyst carrier which may enhance the platinum catalyst loading capacity to reduce the waste of precursor staffs, in comparison with the non-carboxylic nanometer tubes under the conditions of the same amount of precursor adding staffs of platinum, carboxylic nanometer tubes can obtain the higher current density load, which increased in around 4.5 times (nitrate nature changed current density). The aging method applied to restore platinum (Pt) catalyst at the experiment of carbon carrier, the comparison with the platinum (Pt) catalyst in reduction of the nanometer tubes and carbon black (XC-72). The ratio of Current density size of 10 Wt％ nitrate carboxylic nature changed into the carrier current density > carbon black (XC-72) . The conclusion is that the load ratio of the same-weight unified platinum (Pt) catalyst of carboxylic nature changing nanometer tube are 3 times of the carbon black (XC-72).