質子交換膜燃料電池的陰極端在不同操作條件下之模擬分析

Numerical Analysis on the Cathode in the PEMFC

陳彥同(Yan-Tung Chen)

指導教授 ： 林育才

元智大學/工程學院/機械工程學系/碩士(2006年)

摘要

本文半電池模型只考慮質子交換膜燃電池(PEMFC)的陰極端流道及陰極端擴散層，並針對蛇型流道及指叉型流道模擬分析。在改變陰極端操作溫度與入口速度下，觀察電池的性能並比較其影響。經由模擬發現因流道型式、操作溫度、入口流速的不同，在設定不同氧氣濃度消耗量情況下，所得電流密度會有所改變。但就整體趨勢而言，可以利用多項式迴歸及均方根值誤差法，找出針對質子交換膜燃電池之半經驗公式中的參數 及薄膜阻抗 值，求得半電池電流密度所相對應於全電池的電壓，以驗證半電池模型取代全電池的可行性。結果發現，除了在低流量、低電壓高電流時，半電池性能曲線與全電池性能曲線有偏離的現象外，其他情況半電池的模擬結果都能大致與全電池吻合。若無濃度質傳極限的現象，則可增加半電池取代全電池模擬性能曲線之可行性。

關鍵字

質子交換膜燃料電池 ； 半電池模型 ； 數值模擬 ； 陰極端

並列摘要

In this paper, a half-cell model, only considering the gas channel and the gas diffusion layer on the cathode, has been proposed and applied to two types of flow channel, the serpentine and the interdigitated channel. The corresponding cell performance has also been obtained under several operating conditions. It is found that the current density is affected by different parameters, such as the flow type, the operating temperature, the inlet velocity, and the oxygen consumption. In order to compare with the performance of the whole-cell model, the Polynomial Regression and the Root Mean Square Error have been used to determine the corresponding constants in the empirical formulation we used in the paper. It is shown that the half-cell model can be used to replace the whole cell model with appropriate empirical formulation and constants to save computational time. At lower mass flow rates and in higher current densities, there may be some discrepancy between these two models due to the concentration polarization effect. However, under other conditions, the half-cell model work quite well and can be used to replace the whole-cell model.

並列關鍵字

PEMFC ； Half-Cell Model ； Numerical simulation ； Cathode

參考文獻

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