質子交換膜燃料電池具有其工作溫度較低、高效率、無汙染、低噪音、啟動快、並可於室溫達到高功率電流密度輸出等優點，被視為下一代動力系統或攜帶式電源的最佳選擇。本論文係考慮液態水對電池性能影響，且將數值結果與實驗數據比較。本論文也探討電池操作溫度、陰陽極加濕溫度、陽極化學計量、陰極化學計量及氣體擴散層幾何形狀對溫度分佈、氧氣濃度及液態水分佈及燃料電池性能的效應。
結果顯示，在考慮液態水效應下，數值模擬所得結果與實驗數據較為接近，因能夠接近真實操作情況；電池性能以操作溫度為333 K比其他溫度（313 K與353 K）較好；以陽極化學計量為1.5 X比其他計量（1.2 X與1.8 X）較好；以陰極化學劑量為2.5 X比其他計量（1.5 X與2.0 X）較好。改變氣體擴散層幾何形狀方面，具凸起氣體擴散層之燃料電池確實有助於提升電池性能並改善流場特性。

The major advantages of proton exchange membrane fuel cell (PEMFC) are low-temperature operation, high efficiency, no emission, low noise, and quick starting to high energy and current density under room temperature. Therefore, they are valued as the best choice in the next generation dynamic system or the portable power source in recent years. This thesis is to consider the influence of liquid water on performance of PEMFC and compare numerical results with experimental ones. This thesis also explores the effect of fuel cell temperature, anode and cathode humidification temperatures, anode and cathode stoichiometric flow ratios, and the geometry of gas diffusion layer on the temperature distribution, oxygen concentration and liquid water distribution, and the performance of PEMFC.
The results showed that considering the liquid water effect, numerical simulation results are more agreeable with the experimental data because of being closer to realistic operating conditions. The cell performance is better for 333 K of fuel cell temperature than for others temperatures (313 K and 353 K), for 1.5 X of anode stoichiometric flow ratio than for other (1.2 X and 1.8 X), and for 2.5 X of cathode stoichiometric flow ratio than for others (1.5 X and 1.8 X). Changing the geometry of gas diffusion layer, the PEMFC with Prominent GDL Layer does to improve the performance and the flow characteristics.

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