本研究利用化學氣相沉積法將石墨烯成長於鎳金屬多孔材上作為腐蝕抑制層，並與市面上常見之抗蝕鍍層，氮化鈦鍍層與金鍍層進行比較；藉由表面微觀結構檢測、接觸角量測、電阻量測以及腐蝕極化測試，以分析不同鍍層之鎳金屬多孔材的化學特性與物理特性，並進一步組成單電池，進行電池性能量測、電化學交流阻抗頻譜分析以及長時間穩定性測試，以了解應用不同鍍層之鎳金屬多孔材於燃料電池內流道中之影響。 石墨烯鍍層於微觀檢測中，具有緻密的表面結構；於pH=3、80 ℃腐蝕極化測試後，結果顯示石墨烯鍍層試片仍具有優異的導電性與疏水性，並且具有最小之腐蝕電流密度為6.5x10-7 A/cm2，與基材相差了九倍之多。於單電池性能測試結果顯示，石墨烯鍍層單電池於50 ℃同加濕溫度條件下且電壓為0.6 V時，電流密度為1068 mA/cm2，具有最佳之電池性能表現，並於長時間穩定性測試下，平均輸出電流為24.31 A，顯示石墨烯鍍層具有優異的疏水特性與抗腐蝕能力。由此可知石墨烯鍍層不僅具有穩定的化學性質與優異的物理性質，成為當今最薄之腐蝕抑制層，又因石墨烯可成長於任何幾何形狀之試片，因此於表面處理中，具有相當大的發展潛能。 ;In this study, Graphene, TiN and Au are coated on the nickel foam by CVD, PVD, and electroplating process as the corrosion-inhibiting. SEM, contact angle, electrical resistance and electrochemical methods are used to characterize the properties of the different coatings. Furthermore, these surface treated nickel foam are used in single PEM fuel cell as flow distributor. I-V curves, long-term stability test and EIS are measured to investigate the effects of properties of nickel foam on the performance of PEM fuel cell. Results from the SEM images of graphene-coated surface show that have relatively dense structures. After electrochemical test measured in pH=3 H2SO4 solution at 80 oC, graphene-coated foam still possess the best conductivity and hydrophobicity. The corrosion current density of graphene-coated foam at 80 oC reaches 6.5x10-7 A/cm2, which is the best corrosion resistance. Fuel cell operated at 50 C, the current density at 0.6 V for the fuel cell with graphene-coated foam reaches 1068 mA/cm2. Long term stability test also show that the fuel cell can maintain stable current output in 50 hours. These results demonstrate that graphene-coated has great potential for anti-corrosion for PEM fuel cell.
