燃料電池成為近年綠能的關注焦點，但由於氫氣儲存、運輸與加氫站興建之困難，使用重組器即時產氫供給燃料電池發電，可減少中間過程的能源轉換效率損失，但重組氣體中的混合氣體含有微量的一氧化碳將會影響燃料電池之性能，而高溫燃料電池能夠有效提高對於一氧化碳之容忍度，因此開發高溫型質子交換膜燃料電池成為未來趨勢之一。本研究以高溫燃料電池作為研究對象，探討高溫型質子交換膜燃料電池堆通入模擬重組氣體與CO毒化特性研究。
本研究利用極化曲線、電化學阻抗頻譜和即時氣體分析儀對燃料電池進行性能、阻抗與陽極出口尾氣分析，探討參數包括電堆鎖附扭力、操作溫度、氫氣計量比、空氣計量比、一氧化碳濃度及陽極出口尾氣氣體濃度分析。實驗結果顯示尋找最佳鎖附扭力為燃料電池之重要參數，其鎖附扭矩由25kgf-cm增加至最佳扭力為37.5 kgf-cm，使燃料電池之最佳功率密度上升5.9%。重組氣體含有氮氣與二氧化碳僅對燃料電池造成氫氣之稀釋效應，但對於燃料電池之性能影響不大，氫氣劑量比在固定在1.3並添加稀釋氣體35%氮氣或二氧化碳都僅使性能衰退3%，稀釋氣體中夾帶微量一氧化碳將會加劇一氧化碳對燃料電池性能影響。不論燃料電池陽極含有多少百分比(0.5%~3%)的一氧化碳，其尾氣含有的一氧化碳濃度皆會受到操作溫度影響，本實驗發現陽極出口尾氣所偵測到之一氧化碳濃度濃度由大小隨溫度變化為[CO]165°C >[CO]160°C >[CO]155°C。

The fuel cell has become one of the roles of green energy in recent years. Applying reformer to produce hydrogen rich gas to generate electricity by fuel cell can reduce the loss of energy efficiency during production and transportation processes. The recombination gas containing carbon monoxide will affect the performance of fuel cell. High-temperature fuel cell can effectively improve the tolerance to carbon monoxide, so the development of high-temperature proton exchange membrane fuel cell has become one of the promising trends. This study takes high-temperature fuel cell stack as the research object. It discusses the research on the recombination gas and CO poisoning of high-temperature proton exchange membrane fuel cell stack.
In this study, the polarization curve and electrochemical impedance spectrum were used to analyze the HT-PEMFC stack performance. In addition, use a gas analyzer to analyze the gas coming from an anode outlet. The parameters discussed included fuel cell stack clamping torque, operating temperature, hydrogen & air stoichiometric ratio, carbon monoxide concentration, and anode outlet exhaust gas. The experimental results show that finding the best clamping torque is an important parameter of the fuel cell stack. The performance of the stack is increased from 25 kgf-cm to the best torque of 37.5 kgf-cm and the power density at current density 400 mA/cm2 is increased from 190 mW/cm2 to 201 mW/cm2. Percentage increased by 5.9 %.
The carbon dioxide in the recombination gas only has dilution effect on fuel cell stack performance and not much impact on it. Hydrogen contains 35% nitrogen or carbon dioxide only reduce power density by 3 % & 2 %. In addition, the carbon monoxide in the diluted gas increase the poisoning effect on fuel cell stack performance. Regardless of how much percentage (i.e. 0.5~3%) of carbon monoxide contained in the fuel cell stack, the carbon monoxide concentration of the anode outlet gas was affected by the operating temperature. This study found that the concentration of carbon monoxide from high to low according to operating temperature as follows: [CO]165°C>[CO]160°C>[CO]155°C.

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