Investigation of Combined Electric and Mass Transport Effects on Local Electrochemical Reaction in a PEMFC

電流質傳整合效應對質子交換膜燃料電池局部電化學反應影響研究

江木勝(Mu-Sheng Chiang) ； 王得安(Der-An Wang) ； 謝雅意(Ya-Yi Hsieh) ； 劉旭昉(Syu-Fang Liu) ； 袁平(Ping Yuan)

《中國機械工程學刊》 33卷3期 (2012/06) Pp. 231-240

https://doi.org/10.29979/JCSME.201206.0006

摘要

本研究目的在探討質子交換膜燃料電池內部電極中，電流與質傳整合效應對局部反應特性之影響。經使用描述電池中各相電流與流體傳輸之三維數值模式，探討兩種在進出口不同肩部與流道寬度雙極板設計形態之電池性能差異。數值研究過程中亦考慮電池操作與設計參數如電壓與雙極板肩部流道面積比。結果顯示電池中之主要傳輸性質具有高度之不均勻性，其分佈受到操作條件與流場形態之影響。同時電池中之局部電化學反應特性為電位場與反應物濃度相對強度之妥協結果。文中同時探討在不同操作條件與位置下影響局部反應之主要因素，並進一步解析比較本研究中所使用流場形態之分區平均電流密度。

並列摘要

The objective of this study is to explore the combined effect of electric and mass transport on the local reaction characteristics in the cathode electrode of a proton exchange membrane fuel cell. A three dimensional numerical model describing the underlying transport processes including electric currents and fluids is utilized to conduct the investigation with two different bipolar plate configurations by adjusting the transverse dimensions of shoulder and channel at inlet and outlet ports. Therefore, two flow field patterns, IEOC and ICOE are developed and employed. The simulation also considers various parameters such as cell voltage and shoulder-channel area ratio. Results show that the major transport species are highly non-uniform throughout the interested domain and their intensity distributions are influenced by the operation condition and flow field pattern. Furthermore, the local electrochemical reaction exhibits a characteristic resulting from a compromise of the relative strengths between potential field and reactant concentration. At different operation condition and electrode position, decisive factor that influents regional cell reaction is discussed. A further resolution is accomplished on segmental average current density for the new flow field configurations employed in this study.

並列關鍵字

PEMFC ； Electrochemical reaction ； Overpotential ； Combined effect