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標題: 塗佈還原氧化石墨烯於陽極氣體擴散層以提升質子交換膜燃料電池之性能
Improvement of PEMFC Performance by Coating Reduced Graphene Oxide on the Anode Gas Diffusion Layer
作者: 張皓翔
Hao-Hsiang Chang
關鍵字: 質子交換膜燃料電池;觸媒層;氣體擴散層;還原氧化石墨烯;Proton exchange membrane fuel cell;Catalyst layer;Gas diffusion layer;Reduced graphene oxide
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質子交換膜燃料電池具有高轉換效率、能量密度很高、操作快速容易、零污染等優點。但一般燃料電池的製作仍須要克服很多挑戰,如觸媒分散性不佳、白金價格昂貴、水管理不容易掌握等都是造成PEMFC效能無法提升的問題之一,因此研究第一部分主要探討如何增加Pt在碳黑載體上的分散性,本研究使用雙氧水對碳黑表面進行表面改質,使碳黑表面佈滿含氧官能基,增加碳黑在水中的分散性,由XRD圖可以看到Pt晶粒尺寸從6.56 nm減小到4.26 nm,TEM圖則證實確實有助於減少Pt團聚現象的發生,因而提高了電池的輸出功率。
第三部分主要會去探討在陽極氣體擴散層上塗佈石墨烯來改善水管理,且利用石墨烯高導電率的特性來降低極化現象的發生,由接觸角分析結果發現隨還原氧化石墨烯塗佈量增加接觸角有下降的趨勢,表示親水性增加,能達到潤濕的效果幫助氫離子傳遞,在65 ℃操作溫度下,塗佈2.52mg/cm2還原氧化石墨烯的電流密度由0.395 W/cm2增加為0.538 W/cm2,證實塗佈還原氧化石墨烯於氣體擴散層上,確實有助於效率的提升。

Proton exchange membrane fuel cells have the advantages of high conversion efficiency, high energy density, fast and easy operation, and zero pollution. However, the production of fuel cells still needs to overcome many challenges. The poor dispersion of catalysts, the high price of platinum, and the difficulty in mastering water management are all problems that cannot improve the performance of PEMFC. Therefore, the first part of the experiment will mainly discuss how to increase the dispersibility of Pt particles on the carbon black carrier. In this study, the surface of carbon black was surface-modified with hydrogen peroxide, and the surface of carbon black was filled with oxygen-containing functional groups to increase the dispersibility of carbon black in water. From the XRD pattern, the Pt particle size decreases from 6.56 nm to 4.26 nm.It was confirmed that the surface treatment of carbon black by hydrogen peroxide really reduce the occurrence of Pt agglomeration.
The second part will combine the one-dimensional carbon black structure with two-dimensional graphene to form a new 3D composite structure. It is expected that the high specific surface area of graphene will increase the dispersion of carbon black and make Pt more distributed during reduction. However, it was found by SEM and TEM that agglomeration occurred, and the current density decreased with the increase of graphene addition, mainly due to the poor interaction between graphene and Pt.
The third part will mainly discuss the coating of graphene on the anode gas diffusion layer to improve water management and use the high conductivity of graphene to reduce the occurrence of polarization. From the contact angle analysis results, it is found that the contact angle decreases with the increase of the amount of reduced graphene oxide coating, indicating that the hydrophilicity is increased, and the wetting effect can be achieved to help the hydrogen ion transfer. At 65°C operating temperature, the power density of coating 2.52mg/cm2 reduced graphene oxide increased from 0.395 W/cm2 to 0.538 W/cm2. It was confirmed that coating graphene oxide on anode gas diffusion layer can really increase efficiency.
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