燃料電池系統中，陰陽兩極均使用鉑(Pt)系金屬爲觸媒，但爲了降低Pt的使用量及生 產成本，目前均使用兼具高導電性及高表面積的碳材作爲觸媒載體，可有效地分散觸媒與 增加觸媒使用率。本實驗目的在於瞭解Pt系觸媒使用不同載體碳材，如商用碳黑(XC72)， 石墨化碳(GC)，高表面積石墨化碳(GHSAC)之電化學活性與其耐久性。硏究中使用直流電 電化學掃描法(Dc-polarization)，旋轉電極(Rotating Disk Electrode, RDE)與循環伏安法(Cyclic Voltammetry, CV)等電化學方法，於模擬燃料電池環境之0.5 M硫酸下，進行不同載體之觸 媒電化學活性(Electrochemical Catalyst Surface Activity, ECSA)與其氧還原反應(Oxygen Reduction Reaction, ORR)活性之探討，最後進行不同載體觸媒之加速劣化測試(Accelerated Degradation Test, ADT)，以瞭解不同載體在長時間操作下對觸媒活性之影響。本硏究結果 顯示：Pt/GC之初始ECSA和ORR活性略低於Pt/XC72和Pt/GHSAC，但經過400次ADT 循環測試後，其活性可高於其他兩種碳載體觸媒，顯示此三種不同碳載體觸媒中，以Pt/GC 之耐久性爲最佳，其碳載體經高度石墨化(R=0.69)特性可有效抑制碳腐蝕，因此具備長時間 操作之穩定性。

Platinum (Pt) are usually used as electro-catalysts in proton exchange fuel cells (PEMFCs). In order to reduce the Pt loading and production cost, carbon materials with high conductivity and high surface area were used as catalyst support for increasing the catalyst dispersing and catalyst utilization. The electrochemical activity and durability of catalyst with different carbon support, such as acetylene carbon black (XC72), graphitized carbon (GC) and graphitized carbon with high surface area (GHSAC) were investigated using dc-polarization methods such as rotating disk electrode (RDE) and cyclic voltammetry (CV) in 0.5 M sulfuric acid under simulated fuel cell environment. The effect of different carbon supports on electrochemical catalyst surface activity (ECSA) and oxygen reduction reaction (ORR) were discussed in this study. The degradation of catalysts with different supports was discovered by accelerated degradation test (ADT) to understand the degraded mechanism of catalyst support in long-term operating test. In this study, the initial activity (ECSA and ORR) of Pt/GC were a little bit smaller than those of Pt/XC72 and Pt/GHSAC. After the ADT over 400 cycles, Pt/GC showed the highest activity among these catalysts and the activity differences decreased for longer cycling test. From these results, Pt/GC was more durable and was suitable for long-term operation due to its higher degree of graphitization (R = 0.69), which can inhibit the carbon corrosion reaction on the carbon support.