質子交換膜燃料電池電流密度及水分佈之觀測研究

Analysis of Current Density and Water Distribution on PEM Fuel Cell

吳佩珊(Pei-shan Wu)

指導教授 ： 郭景宗

國立臺灣大學/工學院/機械工程學研究所/碩士(2005年)

https://doi.org/10.6342/NTU.2005.01052

摘要

在質子交換膜燃料電池中，質子交換膜為了保持質子的傳導率，需要提供它水分，水管理方式與質子傳導率為息息相關，且有利於改善電池效能。

本實驗展示一種新的方法，可以提供一個視窗展現在電池運作時的液態水分佈。這個特別設計的電池是用以研究在不同加溼的狀況與流道的設計下，測量各時間與位置的電流密度。電流分佈量測是使用電流多通傳輸法，將電流分流器連接至相對應的區域以測量電流。進一步地，在陰極端的液態水形成之影像可以解釋在流道內淹水的現象。

此實驗使用兩種流道型式，在不同的氣體流量以及加熱溫度下操作。結果顯示，陽極端有一個氫氣入口的情況下，電池效能會隨著氣體流量增加而減少；與單進口相反，陽極端有兩個氫氣入口的情形下，電池效能會隨著氣體流量增加而增加。

關鍵字

質子交換膜燃料電池 ； 電流密度 ； 液態水分佈

並列摘要

In PEMFC, polymer membrane requires supplying with water in order to retain its proton conductivity, which depends strongly on the water management, which is essential for the enhancement of cell performance.

This experiment displays a novel method that provides a window which shows the distribution of liquid water in a fuel cell under operation. This specially designed cell is intended for use in studies on time and location measured current densities with different humidification and flow field design. Current distribution was measured by shunts with current multiplex method connected to the corresponding segments. Furthermore, image of water formed inside the cathode is presented to explain the phenomenon of water flooding in the gas channels.

There are two kinds of flow field in this experiment operated with different gas flow rates、heating temperatures. The results present with one hydrogen inlet in the anode, the performance is diminished with increasing gas flow rate; contrary to one hydrogen inlet, with two hydrogen inlets in the anode, the performance is increasing with increasing gas flow rate.

並列關鍵字

polymer exchange membran fuel cell(pemfc) ； current density ； liquid water distribution

參考文獻

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