Investigation on the operating parameters and the patterns of flow channels for the electric power performed from the hydrogen fuel cell system

• Main Authors: Hsin-LiChen, 陳信利
• Other Authors: Wen-Tung Wu
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/26926929355123731308

碩士 === 國立成功大學 === 化學工程學系 === 102 === The fuel cell is considered to be one of the potential clean energy. In this study, the platinum catalyst was made and applied to the proton exchange membrane fuel cell, to investigate the effects of different operating conditions and manifold design its efficacy. The preparation of platinum catalyst is based on the carbon nanotube as a carrier, using the dry impregnation method to impregnate it in the solution of dihydrogen hexachloroplatinate (IV) hexahydrate, then reduced by sodium borohydride. The catalyst prepared was characterized with XRD, SEM, TEM and other instruments. The catalyst slurry was formulated on the 50% hydrophobic of carbon paper. After thermoforming it with the Nafion® 117, the so-called membrane electrode assembly was under a series of single cell test. By changing the operating parameters (cell operating temperature, flow rate, cathode oxygen feed concentration, locking torque, etc.) and manifold design (open ratio, flow patterns, etc.), the results of the fuel cell polarization curves (VI curve) and power curve (PI curve) can be the basis of battery performance. Experimental results show that supplying high oxygen concentration to the cathodes, increasing the flow rate of hydrogen to the anode and air to the cathode, can improve the performance of a single cell. Different channel areas affect the open ratio: it too high will reduce its effect of electronic collection, while it too low will not make full use of the catalyst, and the optimum value is 63% in the experimental. Finally, the serpentine channel is not easy to accumulate water in the cathode, having a small diffusion resistance, allowing a superior performance of it over that of the parallel channel. This study use air as oxidant to achieve the best performance 176.3 mW/cm2.