5. Conclusions and recommendations
5.3. Recommendations
Moreover, a cell with higher catalyst loading leads to more rapid electrochemical reactions, but this may also result in too much liquid water generation. This ultimately impedes oxygen transport, so excessive catalyst loading does not improve cell performance. Among the values considered in this chapter, the optimum loading is mPt =0.4m .
Finally, the GDL thickness is found to play an important role in liquid water transport. A thinner layer offers less resistance to liquid water diffusion and drainage. Water content and cell performance therefore tend to remain constant. When the gas diffusion layer is thick, liquid water cannot drain effectively and the catalyst pellets will have less surface oxygen. According to these results, the optimum thickness is δGDL =245μm.
5.3. Recommendations
In this work, the transient behavior for a PEM fuel cell via two-phase transient and half cell model which based on a thin film-agglomerate approach has been applied to investigate the transport of gaseous species, liquid water, proton, and electrochemical kinetics in great detail.
Generally, the results obtained from this model are in agreement with experimental data. However, there are still a number of improvements for this model that can be done in the future.
1. Extend the model from one-dimensional to two-dimensional or higher-dimensional.
2. Extend the computation domain form cathode to a single cell.
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Author
姓名 張時明
地址 新竹市關東路 260 巷 79 號 學歷
國立交通大學機械工程學系博士班 89/9~
國立交通大學機械工程學系碩士班 88/9~89/6 國立交通大學械械工程學系學士班 85/9~88/6
明新工專機械科 76/9~81/6
經歷
工研院醫材中心副工程師 95/11~
陸軍中尉連輔導長 83/1~85/4
陸軍少尉連輔導長 82/6~83/1
陸軍少尉政戰官 82/1~82/6
Publication list
Journal Paper
1. Chang, S.-M. and Chu, H.-S., Transient behavior of a PEMFC. Journal of Power Sources, 2006. 161(2): p. 1161-1168.
2. Chang, S.-M. and Chu, H.-S., A Transient Model of PEM Fuel Cells Based on a Spherical Thin Film-Agglomerate Approach. Journal of Power Sources, 2007, In press.
Conference Paper
1. Chu, H.-S. and Chang, S.-M., A two-phase, transient model for the cathode of a PEMFC using thin film-agglomerate approach, in The 4th International Conference on FUEL CELL SCIENCE, ENGINEERING and TECHNOLOGY. 2006: Irvine, CA.