高溫型質子交換膜燃料電池性能與活化效應探討

Performance and Activation Investigation of High Temperature Proton Exchange Membrane Fuel Cell

簡偉翔(Wei-Hsiang Chien)

指導教授 ： 蘇艾

元智大學/工程學院/機械工程學系/碩士(2007年)

https://doi.org/10.6838/YZU.2007.00096

摘要

一般而言，「水」在低溫質子交換膜燃料電池中扮演的影響性能好壞以及穩定之重要角色，高溫型質子交換模燃料電池由於在操作過程中，液態水大致已成氣態，因此其對性能之影響層面上將有所不同，積水之影響大幅的降低，且性能不因乾燥氣體之使用而低落，故高溫環境下的操作，將可大幅減低水熱管理，未來更可直接搭配重組器使用。
高溫型質子交換膜燃料電池在特定的溫度及電流負載下，有近似低溫的活化情況發生。因此，本研究將高溫型質子交換膜燃料電池活化操作分成兩部份進行分析討論：(1)活化時間方面，使用不同程度之電流負載如0.1、0.2、0.4以及0.8A/cm2進行長時間定電流放電，而小電流負載操作雖活化時間較長，但可有較完整之活化，因此以時間及性能為考量之前提下，0.4 A/cm2為最佳操作參數；(2)深層活化部份，先以小電流0.01 A/cm2活化50小時再以0.2及0.4 A/cm2各自操作10小時，如此操作可使性能再提升10%。
另外在研究中長時間操作所出現之性能衰退現象，經SEM以及TEM之檢測結果可研判衰退現象與膜材缺損和觸媒聚集相關，此兩項因素將導致導電度以及觸媒反應面積降低。

關鍵字

高溫型質子交換膜燃料電池 ； 活化 ； 性能衰退

並列摘要

General speaking, liquid water acts the important role about fuel cell performance and stability. Due to the most of liquid water will be vapor in the process of operating High Temperature Proton Exchange Membrane Fuel Cell (HT-PEMFC), therefore the performance is different of LT-PEMFC. Effect of flooding and membrane drying will greatly reduce. Performance using dried fuel will be better than low temperature.
After some specific procedure of activation operation, performance of low temperature proton exchange membrane fuel cell (LT-PEMFC) will be promoted and stable. High temperature proton exchange membrane fuel cell (HT-PEMFC) at some specific procedure such as some temperature and current load operate for a period of time, the performance will occurred some situation like low temperature. By this way, we can activate MEA of HT-PEMFC with different parameter to observe influence of activation results. Activation of HT-PEMFC was discussed with two parts:(1) At the part of activation time, operating at a long time with constant current which current load was different current density such as 0.2, 0.4 and 0.8 A/cm2. Operation time of little current load was longer than larger, but the activation was more completely and the performance was better than larger ; (2) At the part of profound activation, after continue 50 hours operating with little current density 0.1 A/cm2, change current density to 0.2 and 0.4 A/cm2 for 10 hours. The performance enhances 10% at 0.5V.
Furthermore, SEM and TEM results indicate that membrane damage and catalyst particle account performance degradation.

並列關鍵字

PEMFC ； high temperature PEMFC ； activation ； performance degradation

參考文獻

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