- 學位論文
透明PEMFC不同溫度下陰極水生成觀測
Transparent PEMFC cathode water at different temperatures to generate observations
摘要
在燃料電池的發展歷程中，流道的積水現象一直都是影響性能優劣的主要因素，流道中液態水生成的位置以及生成量，都直接影響了電池的效能，陰極流道中如果有過量的積水會導致陰極薄膜積水而阻礙氣體的擴散，但若是氣體的流量過大亦或者是電池溫度過熱也會產生乾膜，導致電池的性能下降。 PEMFC燃料電池性能的優劣取決於許多相互依賴的參數，本實驗以壓克力板為window，將不鏽鋼以CNC方法加工刻出蛇行流道後再經鍍金加工之流道板，中間夾上以碳布、Ion power質子膜熱壓後的膜電極組，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、固定陰陽極氣體流量，觀察陰極氣體在不同濃度及溼度的電流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、電壓變化來分析彼此之間的影響性。並以CCD 攝影機拍攝觀察且紀錄在不同溫濕度下陰極流道內之積水狀況，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，探討陰極流道積水對PEMFC 性能穩定性之影響。 關鍵字：質子交換膜燃料電池、膜電極組、流道板。
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 stainless steel and two-channel serpentine current collect plate、Plexiglas end plant. From then on, The status of this step is then confirmed and stabilized by constructing、testing、activation process. Experiments are to supply a fixed current, fixed cathode and anode gas flow was observed in different tone and gas concentration and humidity of the current operation in a long time under the effect arising from stagnant water, then to analyze with the influence of a battery-generated power and the changes in voltage. Besides, with CCD camera to observe and record temperature and humidity are in different circumstances within the cathode water flow conditions, and to observe that what the effect on cathode gas concentration and humidity in different current equivalent operation in a long time under arising from stagnant water is. Then, to explore what the influence of PEMFC performance stability with the cathode water flow is.