燃料相对湿度对薄膜含水量及质子交换膜燃料电池性能效应The Effect .PDF

中正嶺學報 第三十八卷 第一期 民國 98.11. JOURNAL OF C.C.I.T., VOL.38, NO.1, NOV., 2009 燃料相對濕度對薄膜含水量及質子交換膜燃料電池 性能效應 * 王金燦 鄭沛倫 國立宜蘭大學機械與機電工程學系 摘 要 反應氣體相對濕度對薄膜含水量影響顯著，為電池輸出效能重要指標之一，本研究擬透過 數值模擬法，針對不同陽極、陰極燃料相對濕度，對薄膜水含量分佈、質傳與電流密度、陰 極流道積水等因子進行分析。研究結果顯示，在低電壓及陽極濕度不足下，雖能有效降低陰 極流道積水問題，但將嚴重降低薄膜水含量，致使電池效能驟減。此外，當入口燃料濕度於 RHa=100%且RHc=25%時，為最佳進氣條件，對陰極流道積水問題及電池效能將有顯著改善與 提升，這些研究結果將有助於提升質子交換膜燃料電池性能。 關鍵詞： 相對濕度，薄膜含水量，質子交換膜燃料電池 The Effect of Humidity of Reactants on the Membrane Water Content and the Cell Performance for PEMFC * Chin-Tsan Wang , Pei-Lun Zheng Department of Mechanical and Electro-Mechanical Engineering, National I-Lan University ABSTRACT The effect of humidity of the reactants on the membrane water content is very significant and could be acted as one of important index for cell performance. In this study, a numerical simulation would be applied to investigate the distribution of membrane water content, the mass transport phenomenon, current density and water flooding in cathode flow channel under the different relative humidity of anode and cathode, respectively. Results show that the low humidity of anode and low current density would reduce the issue of water flooding in cathode flow channel effectively but seriously reduces the membrane water content and further inducing the failure of cell performance. In addition, when the relative humidity is RHa=100% and RHc=25% for the inlet of anode and cathode would be a