臺灣博碩士論文加值系統

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。

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.

目錄
摘要
英文摘要
目錄
表目錄
圖目錄
第一章 緒論 …………………………………………………………1
1-1 前言 ……………………………………………………………1
1-1.1 緣起 …………………………………………………………1
1-1.2 燃料電池的發展 ……………………………………………2
1-2 研究動機 ……………………………………………………3
1-3 研究目的 ……………………………………………………5
第二章 理論分析與文獻回顧 ………………………………………6
2-1 質子交換膜燃料電池之運作原理 …………………………6
2-1.1 燃料電池內部的電化學反應 ………………………………6
2-1.2 燃料電池的機械構造 ………………………………………7
2-2 燃料電池內部之水傳輸與影響……………………………… 8
2-3 理論計算………………………………………………………9
2-3.1 進氣量、加濕溫度與電池操作溫度之關係 ………………9
2-3.2 進氣量之選擇 …………………………………………… 11
2-4 文獻回顧 …………………………………………………… 11
2-4.1 水管理方法與模擬 ……………………………………… 11
2-4.2 燃料電池電流密度之量測方法回顧 …………………… 20
第三章 實驗設備……………………………………………………25
3-1 實驗設備系統 ……………………………………………… 25
3-2 分割電極之單電池 ………………………………………… 28
3-2.1 單電池組合零件 ………………………………………… 28
3-2.2 分割電極之燃料電池組之組裝方式 …………………… 33
3-3 實驗步驟 …………………………………………………… 34
第四章 實驗方法與結果…………………………………………… 36
4-1 測量電流密度與水觀測之單電池設計方法沿革 ………… 36
4-1.1 電流密度量測與水觀測方法之簡介 …………………… 36
4-1.2 第一代水觀測電池 ……………………………………… 37
4-1.2第二代電流密度量測與水觀測電池……………………… 38
4-1.3 新式電流密度量測與水觀測電池 ……………………… 39
4-2 流道設計 …………………………………………………… 40
4-3 單進口實驗之結果 ………………………………………… 42
4-3.1加熱與加濕溫度各為70℃ ……………………………… 42
4-3.2加熱與加濕溫度各為50℃ ……………………………… 45
4-4 雙進口實驗之結果 ………………………………………… 47
4-4.1 加熱與加濕溫度各為70℃ ……………………………… 47
4-4.2 加熱與加濕溫度各為50℃ ……………………………… 50
4-5相同流量之比較與討論 …………………………………… 52
4-5.1 進氣流量0.5SLM ………………………………………… 52
4-5.2 進氣流量0.75SLM …………………………………………53
4-5.3 進氣流量1.0SLM ………………………………………… 54
4-5.4 進氣流量1.5SLM ………………………………………… 56
4-6 水分佈觀測 ………………………………………………… 58
4-6.1燥化現象 ……………………………………………………58
4-6.2 流道積水 …………………………………………………60
4-6.3 出口處………………………………………………………62
第五章 結論與建議 …………………………………………………63
5-1 結論 ………………………………………………………… 63
5-1.1 測量電流密度分佈之單電池設計…………………………63
5-1.2 水觀測之方法 …………………………………………… 63
5-1.3 單進口與雙進口流道形式之比較 ……………………… 64
5-2 反省與建議 ………………………………………………… 65
附錄 ……………………………………………………………………67
參考文獻 ………………………………………………………………83

參考文獻

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