高溫型質子交換膜燃料電池具有較高抗一氧化碳的毒化能力以及高穩定特性，其在熱力學效率與非貴金屬觸媒應用可行性等方面皆具有發展優勢，加上天然氣或甲烷作為富氫氣體來源之高發展性，使得甲烷重組式高溫型質子交換膜燃料電池系統具有成為未來氫能科技主流之一的潛力。本研究結合以上兩項未來趨勢，提供模擬天然氣(甲烷)重組合成氣之不同氣體成分之混合氣作為燃料電池陽極氣體，針對高溫型質子交換膜燃料電池進行性能及電化學阻抗之測試。
在本研究中，使用Polybenzimidazole (PBI)做為膜電極組的材料，此材料具有較高的性能穩定性以及一氧化碳的容忍度，並且使用了金屬雙極板以及石墨雙極板。金屬雙極板具有較佳的機械特性、抗震能力、以及較輕的重量以減少整體重量，因此在本研究中，使用PBI以及金屬雙極板建立一個單電池進行測試。
本實驗結果顯示，操作溫度對高溫型質子交換模燃料電池影響非常顯著，當電池操作溫度由120 oC提高至180 oC時，性能可有效提升。另外，提高溫度能有效提高燃料電池之抗CO毒化能力，於120 oC時，6.10 % CO/balanced H2條件下，性能較純氫條件明顯下降，但當溫度提高至180 oC時，其最大功率密度則較120 oC提高188 %。由電壓暫態行為得知，此現象乃歸因於低溫時CO於觸媒上之吸附反應較為劇烈。同時，甲烷對高溫型質子交換膜燃料電池之影響僅為些微之氫氣稀釋作用。在本研究選定的H2/CO/N2/CH4混合氣成份範圍內，甲烷重組氣成份濃度在電池溫度高於160 oC時，對性能影響不顯著，故建議若甲烷合成氣未經氫氣純化之程序即通入高溫型質子交換模燃料電池，應保持電池溫度高於160 oC以上。

The high-temperature proton exchange membrane fuel cell (PEMFC) has the features of high CO tolerance and high power output stability. In addition, it has the development advantages of high thermodynamic efficiency and high practicability for non-precious metallic catalyst applications. Furthermore, the discovery of shale gases and oil increases the feasibility of using natural gases or methane as sources of hydrogen-rich reformate gases. The development of a reformed methane high-temperature PEMFC system is thus one of the most promising hydrogen technologies. In this study, it is focused on the two such technologies, high-temperature PEMFC and methane reforming. The performance tests and electrochemical impedance analysis of a high-temperature PEMFC are carried out under different simulated methane reformate gases.
Polybenzimidazole (PBI) is used as the membrane material in this study, as it has the features of high-performance stability and high CO tolerance. Moreover, compared to graphite bipolar plates, metallic bipolar plates have better mechanical properties and anti-vibration capability, as well as lighter weight. Metallic bipolar plates and a PBI membrane are used to setup a single cell and examine its performance.
In general, the performance of metallic bipolar plates is better than graphite. However, both of the bipolar material have the same trends. For metallic and graphite bipolar plates, the experimental results show that the cell temperature has a significant effect on the cell performance. When the temperature increases from 120 °C to 180 °C, the performance is significantly enhanced. Moreover, the CO tolerance of the fuel cell increases along with the temperature. At the same time, methane is fed in the anode stream to assess the performance of the cell under different simulated methane reformate gases. The test of various CH4 / H2 mixtures reveals the residual methane in the reformate gases only decreases fuel cell performance slightly due to the dilution effect. H2/CO/N2/CH4 mixtures are also examined in this study, and these had only a small effect on the fuel cell performance at cell temperatures higher than 160 °C. As such, it is recommended that the cell temperature should be kept higher than 160 °C. As a result, it is suggested to maintain fuel cell temperatures greater than 160 oC when using reformate gases without CO cleaning processes

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