觀察透明PEMFC陰極之積水變化(不同氣體濃度與溼度)

To study and observe the water behavior in transparent PEMFC(The variational humidification and concentration of cathode gas)

林幸樵(Hsing-Chiao Lin)

指導教授 ： 翁芳柏

元智大學/工程學院/機械工程學系/碩士(2005年)

摘要

在燃料電池的發展歷程中，流道的積水現象一直是影響性能的主要因素，液態水的生成量以及生成位置，直接影響的電池的效能，陰極如果有過量的積水導致陰極薄膜積水而阻礙氣體的擴散，或氣體流量過大或是電池過熱也會產生乾膜使的電池性能下降。在本實驗的主要目的就是希望由透明的燃料電池來觀察及研究陰極積水現象對電池性能影響，當陰極氣體在氧氣加溼與不加溼、或空氣加濕在濃度上有差異性時，對陰極所產生的積水或乾膜所影響電池性能的程度做判斷才能提供燃料電池在水熱管理的研究上有一個判斷的方法。
本實驗必須固定以Ion Power提供的膜電極組、蛇行流道導電板、端板的材料影響因素，再以固定的組裝、測試、活化程序來保持電池的穩定性，而實驗中以供給固定電流、固定陽極氣體的電流當量，觀察陰極氣體在不同濃度及溼度的電流當量於長時間操作下所產生的積水效應，再搭配電池產生的功率、電壓、歐姆變化來分析彼此之間的影響性。

關鍵字

透明燃料電池 ； 積水研究

並列摘要

In the history of fuel cell development, its performance is always influenced by the water behavior in flow channel blocks. The position of water behavior and moisture directly affects the efficiency of the fuel cell. If the flow channel block of cathode collects much of the water behavior, that fuel can not diffuse easily. Moreover, in case of high fuel flow rate or excess heat in high ampere, the membrane electrode assembly becomes dry and deteriorates the performance of fuel cell. The objective of this experiment is to observe and study the relationship between water behavior of cathode and the performance of the fuel cell in transparent PEMFC when the fuel cell consumes variational humidification and concentration of cathode gas. And we also hope to provide a method to study and solve the problems in water and heat management.
The method we adopt in this experiment is to firstly fix the component of the fuel cell, and to fabricate them with Ion Power’s membrane electrode assembly、gold-coated brass and two-channel serpentine current collect plate、Plexiglas end plant. The status of this step is then confirmed and stabilized by constructing、testing、activation process. Finally,by operating the transparent fuel cell in steady mode of constant current、constant anode flow rate for a long time with the variational humidification and concentration of cathode gas flow rate, we try to observe the water flooding behavior in cathode channel flow as well as to analyze the relationship between the water behavior and the property of power, voltage, ohmage.

並列關鍵字

water flooding behavior