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標題: | 質子交換膜燃料電池金屬雙極板之Cr-C-S複合電鍍 Electroplating of Cr-C-S Composite Coating of Metal Bipolar Plates for Proton Exchange Membrane Fuel Cell |
作者: | Hsun-Heng Lo 駱訓恆 |
指導教授: | 林招松(Chao-Sung Lin) |
關鍵字: | 電鍍,複合電鍍,質子交換膜燃料電池,三價鉻膜層, Electroplating,Composite electroplating,Proton Exchange Membrane Fuel Cell,Trivalent chromium coating, |
出版年 : | 2021 |
學位: | 碩士 |
摘要: | 質子交換膜燃料電池(PEMFC)是具有前瞻性替代傳統石油燃料的方案之一。然而質子交換膜燃料電池要克服的障礙之一是雙極板的材料。這篇論文旨在利用複合電鍍的模式來鍍出一個導電性好與抗腐蝕性佳的膜層。希望能夠藉由電鍍的膜層增進底材的性質來達到雙極板的使用。這些膜層的電化學性質是透過EIS和極化曲線量測。同時也會搭配電子顯微鏡觀測試樣之表面形貌,與電化學測試後表面的改變。最後藉由表面形貌,橫截面影像,與電化學性質來探討複合電鍍物在膜層中扮演的角色與複合電鍍的機制。 實驗結果顯示,預鍍鎳能有效去除表面的氧化層來提升電鍍膜層的附著力。複合電鍍物的添加降低了缺陷並且增加了膜層的厚度。結果顯示複合電鍍物的添加改變了表面形貌與膜層的耐腐蝕性和導電性。長時間浸泡模擬質子交換膜燃料電池陰極環境結果顯示,膜層表面在極化後會生成一層鈍化層來達到穩定。接著進一步討論碳化矽(SiC)作為複合電鍍物的機制,碳化矽顆粒能夠吸附錯合的三價鉻以提升電鍍效率來提升膜層性質。由長時間浸泡模擬陽極的結果表明,添加碳化矽複合電鍍物顯著降低了腐蝕因子的滲入進而改善了鉻碳硫膜層做為雙極板膜層的實用性。 Proton exchange membrane fuel cell (PEMFC) offer a promising alternative to traditional fossil fuel consumption. However, a primary obstacle to overcome is the material for PEMFC bipolar plates. This study aims to use the composite electroplating method to plate a Cr-C-S composite film with good conductivity and corrosion resistance. The goal is to be used as bipolar plates for proton exchange membrane fuel cell. The electrochemical properties of these composite coatings were tested through EIS and polarization measurements. The conductivity was tested through interfacial contact resistance (ICR). An electron microscope was used to observe the surface morphology of the sample and the surface change after electrochemical testing. The effects of composite electroplating and mechanisms are discussed through the results of surface topography, cross-sectional imaging, and electrochemical properties. The experimental results reveal that a primary nickel strike layer is useful to remove the surface oxide layer of stainless steel and improve adherence of the future chromium coating. The addition of composite particles lowered defects and increased the thickness of the coating. As a result, changing the surface morphology along with improving the corrosion resistance and conductivity of the coating. According to potentiostatic test simulating PEMFC cathodic environment a stable passive film forms on the surface. The mechanism of silicon carbide (SiC) as a composite particle is further discussed, with the composite adsorbing complexed Cr (III) particles to improve electrodeposition. Results from simulating PEMFC anodic environment show that the addition of composite SiC significantly improved the viability of the surface coating for use as PEMFC bipolar plates. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/56516 |
DOI: | 10.6342/NTU202100522 |
全文授權: | 有償授權 |
顯示於系所單位: | 材料科學與工程學系 |
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